- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Timing Chain: Service and Repair
REMOVAL
Tools Required = Crankshaft Sprocket Puller
1. Remove the timing cover.
2. Remove the crankshaft position sensor reluctor ring.
3. Remove the camshaft sprocket bolts.
4. Remove camshaft sprocket.
5. Remove timing chain.
6. Remove the crankshaft sprocket.
7. Remove crankshaft sprocket key.
INSTALLATION
1. Install the key into the crankshaft keyway.
2. Use the crankshaft balancer installer to install the crankshaft sprocket.
3. Install the camshaft sprocket and timing chain.
4. Install camshaft sprocket bolts.
Be sure to align the camshaft and the crankshaft sprocket marks. Timing marks (Number 4 Firing).
Tighten bolts to 21 ft. lbs.
5. Align the keyway on the reluctor ring with the key in the crankshaft.
6. Install the reluctor ring onto the crankshaft until the ring is completely seated against the crankshaft sprocket.
7. Install the timing cover.
Remove camshaft covrs Remove front cover Remove or fully retract all three timing chain tensioners Remove oil pump Primary and secondary chain guides should remain in place. Rotate crankshaft until sprocket drive key is at about 1 o'clock position. Set crankshaft and intermediate shaft sprockets into primary drive chain with their timing marks asjacent to each other. Install crankshaft and intermediate sprockets over their respective shafts. Rotating crankshaft as necessary to engage crankshaft key in sprocket without changing the timing mark relationship. Install Flywheel Holder Tool (J-39411) to lock crankshaft in position. Install intermediate shaft sprocket retaining bolt and torque to specifications. Route secondary chain for left cylinder head over inner row of intermediate shaft teeth. Route secondary drive chain over chain guide, and install exhaust cam sprocket to chain so camshaft drive pin engages the sprocket notch marked "LE" (Left Exhaust). There dhould be no slack in the lower section of the chain, and the camshaft drive pin must be perpendicular (90 degrees) to the cylinder head surface. Install the intake camshaft sprocket into the chain so the sprocket notch marked "LI" (Left Intake) engages camshaft drive pin, while drive pin remains perpendicular to the head face. Minor adjustments can be made to camshaft position to get pin to engage by using a wrench on the hex cast into the camshaft. Install sprocket retainer bolts and torque to specification. Repet steps as above to install the right secondary chain to the right camshafts. The right camshaft sprockets are marked "RE" and "RI". In addition, the RE sprocket must contain the camshaft position sensor pickup.
Remove the alternator. Remove the drive belt idler. Remove the drive belt tensioner. Remove the water pump pulley. Remove the intake manifold.
Remove the connector bracket from the left cylinder head cover. Disconnect the right ignition coil connector, condenser connector and remove the bracket.
Remove the left cylinder head cover retaining bolts. Remove the cylinder head cover from the engine.
Remove the right cylinder head cover retaining bolts. Remove the cylinder head cover from the engine.
Set the No. 1 cylinder to TDC on the compression stroke. Turn the crankshaft pulley and align its groove with the timing mark T of the lower timing chain cover.
Check that the mark of the camshaft timing sprockets are in straight line positioning on the cylinder head surface. If not rotate the crankshaft 360 degrees. Do not rotate the engine counterclockwise.
Remove the oil pan. Remove the crankshaft damper pulley. Remove the timing chain cover.
NOTE
Be careful not to damage the contact surfaces of the cylinder block, cylinder head and timing chain cover. Before removing the timing chain, mark the right and left timing chains with an identification mark based on the location of the sprocket because the identification mark on the chain for TDC can be erased.
After compressing the timing chain tensioner, install a set pin. Remove the right cam to cam guide. Remove the right timing chain auto tensioner and timing chain tensioner arm.
Remove the oil pump chain cover. Remove the oil pump chain tensioner assembly. Remove the oil pump chain guide. Remove the right timing chain.
Remove the right timing chain guide. Remove the oil pump chain sprocket and oil pump chain. Remove the crankshaft sprocket, oil pump and camshaft drive gear.
Remove the left cam to cam guide. Remove the left timing chain auto tensioner and timing chain tensioner arm. Remove the left timing chain.
Remove the left timing chain guide. Remove the crankshaft sprocket and left camshaft drive. Remove the tensioner adapter assembly.
Fig. Timing chain and related components-3.8L Engine
To install:
Check the camshaft and crankshaft sprockets for wear and damage, replace as required.
Inspect the tensioner arm and chain guide for wear and damage, replace as required.
Check that the tensioner pin moves smoothly when the ratchet pawl is released with a thin rod.
The key of the crankshaft should be aligned with the timing mark of the timing chain cover. This indicates that the piston is at TDC on the compression stroke.
Install the tensioner adapter assembly. Install the crankshaft sprocket and left camshaft drive.
Install the left timing chain guide and torque the retaining bolts 14-18 ft. lbs.
Install the left timing chain. Be sure to install the chain with no slack between the camshaft and the crankshaft (crankshaft sprocket, timing chain guide, exhaust camshaft sprocket, intake camshaft sprocket). The timing mark of each sprocket should be matched with the timing mark (color ink) of the timing chain at installation of the timing chain.
Fig. Left timing chain markings and installation: (D) exhaust camshaft sprocket (C) intake camshaft sprocket-3.8L Engine
Install the left timing chain tensioner arm and torque the retaining bolts 14-16 ft. lbs.
Install the left timing chain tensioner and torque the retaining bolts 7-9 ft. lbs.
Install the left cam to cam guide and torque the retaining bolts 7-9 ft. lbs.
Install the crankshaft sprocket, oil pump and right camshaft drive.
Install the oil pump chain and oil pump sprocket. Torque the retaining bolt to 14-16 ft. lbs.
Install the right timing chain guide. Torque the retaining bolts to 14-18 ft. lbs.
Install the right timing chain. Be sure to install the chain with no slack between the camshaft and the crankshaft (crankshaft sprocket, intake camshaft sprocket, exhaust camshaft sprocket). The timing mark of each sprocket should be matched with the timing mark (color ink) of the timing chain at installation of the timing chain.
Fig. Right timing chain markings and installation: (C) exhaust camshaft sprocket (B) intake camshaft sprocket-3.8L Engine
Install the right timing chain tensioner arm. Torque the retaining bolts to 14-17 ft. lbs.
Install the right timing chain auto tensioner. Torque the retaining bolts to 7-9 ft. lbs.
Install the right cam to cam guide and torque the retaining bolts to 7-9 ft. lbs.
Install the oil pump chain guide. Torque the retaining bolts to 7-9 ft. lbs.
Install the oil pump tensioner assembly. Torque the retaining bolts to 7-9 ft. lbs.
Pull out the pins on both the left and right hydraulic tensioners. Install the oil pump chain cover.
Rotate the crankshaft two revolutions in the clockwise direction. Confirm the timing mark. Be sure to rotate the crankshaft in the clockwise direction.
Apply sealant on the chain cover and on the cylinder head, cylinder block, and lower oil pan. Be sure these parts are free of engine oil and dirt.
NOTE
Before assembling the timing chain cover, the liquid sealant TB1217H should be applied on the gap between the cylinder head and block. The part must be assembled with five minutes after the sealant is applied.
Fig. Sealant application (1 inch bead width)-3.8L Engine
Apply sealant on the chain cover.
NOTE
The liquid sealant TB1217H should be applied on the gap between the cylinder head and block. The part must be assembled with five minutes after the sealant is applied.
Fig. Timing cover sealant application-3.8L Engine
Install a new gasket to the timing case cover.
NOTE
It is important that the dowel pins on the cylinder block and holes on the timing chain cover should be used as a reference in order to assemble the timing chain cover in the correct position.
Install the timing chain cover. Torque the retaining bolts in the proper sequence and to specification. The engine should not be started for at least thirty minutes after timing chain cover assembly.
Fig. Timing cover bolt torque sequence and specification-3.8L Engine
Install the timing case cover oil seal.
Continue the installation in the reverse order of the removal procedure.
Timing is not resettable by the user, as the computer controls this based on knock or no knock conditions which will advance or ****** ignition timing for optimum performance.
The valve timing is something that is set when installing the timing chain:
2.5L, 2.8L and 3.1L Engines
Fig. 4: Timing chain and sprocket removal - 2.5L engine
Fig. 5: Timing chain and sprocket removal - 1996 3.1L engine shown
Fig. 6: You must use a suitable puller to remove the crankshaft sprocket
Disconnect the negative battery cable.
Remove the timing chain front cover assembly, as outlined earlier in this section.
Rotate the crankshaft until the timing marks on the crankshaft sprocket and camshaft sprocket locator hole are aligned to the marks on the engine block or timing chain dampener. This is the No. 1 piston at TDC (No. 4 firing position).
Unfasten the camshaft sprocket retaining bolt/screw, then remove the camshaft sprocket and the timing chain.
NOTE: If the camshaft sprocket does not come off easily, a light blow on the lower edge of the sprocket with a rubber mallet should loosen the sprocket.
Remove the crankshaft sprocket using tool J 23444-A or equivalent puller.
If necessary, remove the timing chain dampener retaining bolts, then remove the dampener.
To install:
Install the crankshaft sprocket using tool J 38612 until it the sprocket is fully seated on the flange of the crankshaft nose. Apply a coat of Molykote® or equivalent, to the sprocket thrust surface.
Hold the camshaft sprocket with the chain hanging down, and align the marks on the camshaft and crankshaft sprockets.
If removed, install the timing chain damper to the engine block.
Align the dowel in the camshaft with the dowel hole in the camshaft sprocket. Install the camshaft sprocket and chain, use the camshaft sprocket bolts to draw the sprocket on to the camshaft. Tighten the sprocket bolts to 18 ft. lbs. (25 Nm).
Lubricate the timing chain with engine oil.
Install the front cover assembly, as outlined earlier in this section.
Timing Chain and Gears REMOVAL & INSTALLATION 2.2L Engine
Fig. 1: The timing marks on the sprockets should be in alignment. If not, turn the crankshaft until the marks are aligned
Fig. 2: The timing chain tensioner is retained by a Torx head bolt (1) and a regular hex head bolt (2)
Fig. 3: Unfasten the camshaft sprocket bolt
Fig. 4: Remove the camshaft sprocket and the timing chain at the same time . . .
Fig. 5: . . . then remove the tensioner assembly
Fig. 6: Compress the tensioner spring and insert a cotter pin or nail in the hole provided to hold the tensioner in position
Disconnect the negative battery cable.
Remove the front cover as previously detailed.
Place the No. 1 piston at TDC of the compression stroke so that the marks on the camshaft and crankshaft sprockets are in alignment (see illustration).
Loosen the timing chain tensioner nut as far as possible without actually removing it.
Remove the camshaft sprocket bolts and remove the sprocket and chain together. If the sprocket does not slide from the camshaft easily, a light blow with a soft mallet at the lower edge of the sprocket will dislodge it.
Using a suitable gear puller, remove the crankshaft sprocket.
To install:
Press the crankshaft sprocket back onto the crankshaft.
Install the timing chain over the camshaft sprocket and then around the crankshaft sprocket. Make sure that the marks on the two sprockets are in alignment (see illustration). Lubricate the thrust surface with Molykote® or its equivalent.
Align the dowel in the camshaft with the dowel hole in the sprocket and then install the sprocket onto the camshaft. Use the mounting bolts to draw the sprocket onto the camshaft and then tighten to 66-68 ft. lbs. (91-95 Nm).
Lubricate the timing chain with clean engine oil. Tighten the chain tensioner.
Installation of the remaining components is in the reverse order of removal.
Fig. 7: Exploded view of the timing chain and sprockets - 2.2L OHV engine
Remove the timing chain front cover. NOTE: During timing chain and sprocket removal, position the crankshaft 90 degrees past Top Dead Center (TDC) to make sure the pistons will not contact the valves upon assembly.
Carefully rotate the crankshaft clockwise so the timing mark on the crankshaft sprocket and keyway align with the main bearing cap split line.
Remove the bolts, then remove the timing guides and tensioner.
Remove the camshaft sprocket bolts, using a 7?8 in. (21mm) wrench to hold the camshaft. Then remove the timing chain and camshaft sprocket. Remove the crankshaft sprocket, if necessary. To install:
Inspect the chain for wear and damage. Check the inside diameter of the chain, it should be no more than 23.15 in. (588mm). Inspect the chain guides for wear or cracks and the timing sprockets for teeth or key wear. Replace components as necessary.
Verify that the crankshaft is positioned 90 degrees clockwise past TDC. The crankshaft keyway should be at 3 o'clock aligned with the main bearing cap split line to prevent piston and valve damage.
Install the camshaft sprockets, retaining bolts and washers. Make sure the letters FRT on the sprockets face forward, away from the cylinder block. Use the wrench flats provided on the camshafts to hold the shaft and tighten the bolts to 75 ft. lbs. (102 Nm).
Bring the camshafts up to No. 1 TDC by rotating the camshafts and sprocket until the dowel pins are at 12 o'clock. Install a 1?6 in. drill bit into the hole in the sprocket about 9 o'clock.
If removed, install the crankshaft sprocket, then rotate the crankshaft counterclockwise 90 degree up to No. 1 TDC (keyway and sprocket timing mark at 12 o'clock, in alignment with the block timing mark).
Position the timing chain under the crankshaft sprocket and over the camshaft sprockets so 2 silver link plates align with the reference marks on the camshaft sprockets and another 2 plates align with the downward tooth (at 6 o'clock position) on the crankshaft sprocket. Excess chain slack should be located on the tensioner side of the cylinder block.
Verify that the crankshaft reference mark aligns with the cylinder block mark at 12 o'clock and that the timing pins are installed in the holes at about the 9 o'clock position. Remove the timing pins from the camshaft sprockets.
Install the timing chain fixed guide to the right of the block face toward the water pump. Tighten the bolts to 21 ft. lbs. (28 Nm) and verify the chain is snug against the guide.
Install the pivoting chain guide and check for clearance between the block and head. Tighten the bolt to 19 ft. lbs. (26 Nm) and verify the guide pivots freely.
Install the 2 forward camshaft bearing caps and the upper timing chain guide, then tighten the retaining bolts to 124 inch lbs. (14 Nm).
Retract the tensioner plunger and pin the ratchet lever using a 1?8 in. (3.18mm) No. 31 drill bit inserted in the alignment hole at the lower front of the component. Install the tensioner and tighten the bolts to 14 ft. lbs. (19 Nm), then remove the drill bit.
Make one final check to verify all components are properly timed, then remove all timing pins.
Install the timing chain front cover.
Connect the negative battery cable, start the engine and check for leaks.
Fig. 5: Rotate the crankshaft clockwise until the timing mark on the crankshaft sprocket and keyway align with the main bearing cap split line
Install balance shaft drive gear onto the left camshaft.
Install the camshaft sprockets and new bolts finger tight.
Using a vise, compress the timing chain tensioner plunger.
Install a retaining clip on the tensioner to hold plunger IN during installation.
marking timing chain
If timing chain copper links are not visible, mark 2 links on one end and 1 link on the other end to be used as timing marks.
Install right and left timing chain guides. Tighten bolts to 89 in-lbs (10 Nm).
Rotate the left camshaft until the timing mark is at the 12 o'clock position.
Rotate the right camshaft until the timing mark is at the 11 o'clock position.
Position the crankshaft using the special tool. Then remove the tool.
Crankshaft special tool positioning
Install the crankshaft sprocket with flange facing forward.
Crankshaft sprocket timing mark
Position lower end of left (inner) timing chain on the crankshaft sprocket. Align the copper (or marked) chain link with the timing mark on the outer flange of the crankshaft pulley.
NOTE: Upper half of timing chain must be below the tensioner arm dowel.
Position the left timing chain on the camshaft sprocket. The timing mark on the camshaft sprocket must be aligned between the 2 copper (or marked) chain links.
Left camshaft sprocket timing mark
Place the left timing chain tensioner arm on the dowel pin and install the timing chain tensioner and bolts. Tighten bolts to 18 ft-lbs (25 Nm).NOTE: Lower half of timing chain must be above the tensioner arm dowel.
Crankshaft sprocket timing mark
Position lower end of right (outer) timing chain on the crankshaft sprocket. Align the copper (or marked) chain link with the timing mark on the outer flange of the crankshaft pulley.
Right camshaft sprocket timing mark
Position the right timing chain on the camshaft sprocket. The timing mark on the camshaft sprocket must be aligned between the 2 copper (or marked) chain links.
Place the right timing chain tensioner arm on the dowel pin and install the timing chain tensioner and bolts. Tighten bolts to 18 ft-lbs (25 Nm).
Remove the retaining clips from the right and left timing chain tensioners.
Verify alignment of all timing marks.
Install crankshaft sensor ring on crankshaft.
Locate index mark on balance shaft and mark corresponding gear tooth with chalk.
Position balance shaft on journals.
NOTE: It may be helpful to use an inspection mirror to view the marks timing marks.
Align the chalk mark on the balance shaft with the camshaft timing mark.
Balance shaft bearing caps
Install the balance shaft bearing caps in their original locations. Follow the tightening sequence as shown in the illustration. Tighten bolts to 89 in-lbs (10 Nm).
Tighten the camshaft phaser sprocket bolts in the correct sequence using 2 steps, as follows:
Step 1-30 ft-lbs (40 Nm)
Step 2-tighten an additional90 degrees
Position the crankshaft keyway in the 11 o'clock position.
Lubricate and install all camshaft roller followers.
WARNING Engine front cover replacement procedure must be completed within 4 minutes or entire procedure must be repeated. Failure to do so may result in future leaks
Remove the engine front cover. For additional information, refer to Engine Front Cover in this section.
Remove the crankshaft sensor ring from the crankshaft.
Rotate the crankshaft until the timing mark on the RH camshaft sprocket is approximately at the 11 o'clock position and the timing mark on the LH camshaft sprocket is approximately at the 12 o'clock position.
Using the special tool, position the crankshaft as shown.
Install the special tool.
NOTE: LH shown; RH similar. Remove the two bolts, the timing chain tensioner and tensioner arm.
Remove the LH and RH timing chains and the crankshaft sprockets.
Remove the special tool from the crankshaft.
Remove the timing chains from the camshaft sprockets.
Remove the right and left timing chains and the crankshaft sprocket from the crankshaft.
CAUTION: The bolts are different lengths and must be returned to their original location. NOTE: LH shown; RH similar. Remove the bolts and the timing chain guides.
Installation
CAUTION: Timing chain procedures must be followed exactly or damage to valves and pistons will result. CAUTION: Do not compress the ratchet assembly. This will damage the ratchet assembly. Compress the tensioner plunger, using an edge of a vise.
Using a small screwdriver or pick, push back and hold the ratchet mechanism.
While holding the ratchet mechanism, push the ratchet arm back into the tensioner housing.
Install a paper clip into the hole in the tensioner housing to hold the ratchet assembly and plunger in during installation.
Remove the tensioner from the vise.
NOTE: There are 61 links in the timing chain. If the copper links are not visible, mark two links on one end and one link on the other end, and use as timing marks.
Install the timing chain guides.
Using the special tool, verify correct crankshaft position.
Remove the special tool.
NOTE: Crankshaft sprockets are identical. They can only be installed one way. Refer to the following illustration for correct crankshaft sprocket installation. If removed, install LH and RH crankshaft sprockets.
Install the LH timing chain onto the crankshaft sprocket, aligning the one copper (marked) link on the timing chain with the slot on the crankshaft sprocket.
Position the LH timing chain on the camshaft sprocket with the two copper (marked) chain links and the camshaft sprocket timing mark aligned.
Position the RH (outer) timing chain on the crankshaft sprocket, aligning the copper (marked) link with the timing mark on the sprocket.
Position the RH timing chain on the camshaft sprocket. Make sure the two copper (marked) links align with the camshaft sprocket timing mark.
NOTE: LH shown; RH similar. Position the tensioner arms and tensioners, and install the bolts.
Remove the tensioner retaining clip.
As a post-check, verify correct alignment of all timing marks.
Remove the special tool.
Position the crankshaft sensor ring on the crankshaft.
Install the engine front cover. For additional information, refer to Engine Front Cover in this section.
Except Premier
Procedures applying to removal and installation of the auxiliary shaft drive chains are located under Auxiliary (Intermediate or Silent) Shafts Removal and Installation, later in this section. 2.5L Premier Engine (See Figures 1 through 5)
Fig. 1: To remove the timing chain, remove the timing chain case cover Fig. 2: When removing and installing the timing chain the crankshaft and camshaft sprocket timing marks should be aligned as shown Fig. 3: While holding the timing chain, camshaft sprocket and crankshaft sprocket aligned install them onto the engine
Fig. 4: Lock and unlock the timing chain tensioner by switching the tensioner lever, as shown
Fig. 5: To verify correct installation, turn the crankshaft until the camshaft sprocket timing mark is approximately at the one o'clock position, then count the number of chain link pins between the points shown
Disconnect the negative battery cable.
Remove the fan shroud and cooling fan, as described earlier in this section.
Remove the accessory drive belts. For more information, refer to .
Remove the water pump pulley and crankshaft vibration damper, as described earlier in this section.
Remove the timing case cover, as described previously in this section.
It is a good practice to either remove or cover the radiator area when performing extensive repairs to the engine to prevent accidental damage to the radiator core.
Rotate the crankshaft until the 0 timing mark on the crankshaft sprocket is closest to and on a center line with the timing mark on the camshaft sprocket.
Remove the oil slinger from the crankshaft.
Remove the camshaft retaining bolt and remove the sprockets and chain as an assembly.
If the timing chain tensioner is to be replaced, the oil pan must also be removed.
To install:
Turn the tensioner lever to the unlock (down) position and pull the tensioner block toward the tensioner lever to compress the spring. Hold the block and turn the tensioner lever to the lock (up) position.
Install the crankshaft sprocket, camshaft sprocket and timing chain together. Make sure the timing marks are aligned as indicated in Step 6 and in the accompanying illustration.
Install the camshaft sprocket retaining bolt and washer. Tighten the bolt to 80 ft. lbs. (108 Nm).
To verify correct installation of the timing chain, rotate the crankshaft until the camshaft sprocket timing mark is approximately at the 1 o'clock position. Count the number of chain link pins between the camshaft timing mark and the crankshaft timing mark, there should be 20 pins (2 per link) between the marks.
Make sure that the timing chain tensioner switches to the unlocked position. If the tensioner does not switch automatically unlock, switch it manually to the unlock position.
Install the oil slinger.
Install the timing case cover, as described earlier in this section.
Install the water pump pulley and crankshaft vibration damper, as described earlier in this section.
Install and properly tension the accessory drive belts. For more information, refer to .
Install the fan shroud and cooling fan, as described earlier in this section.
Connect the negative battery cable, start the engine and check for leaks.
Here is All Lititure But Pictures Wont show up on FixYa for some reason, I can Email it ALL to you Just Send Me A Request to my Nickname here @aol.com
SPECIAL TOOLS REQUIRED (or equivalents)
J-36008, Camshaft sprocket timing alignment pins.
J-39579, Camshaft sprocket wrench.
CAUTIONS:
The timing chain on the 1996 LD9 (VIN T) Twin Cam Engine is not to be replaced with the timing chain from any other model year. The timing sprockets are different on the Twin Cam Engine and the shape of the links matches the sprockets. Engine damage may result if the wrong timing chain is used.
The timing chain and crankshaft sprocket MUST be marked so that they are reinstalled with the same side facing out at the time of reassembly.
Failure to follow the removal and installation procedures could result in severe engine damage.
REMOVE OR DISCONNECT
Negative battery cable.
Front cover, refer to Timing Cover / Service and Repair .
Rotate crankshaft in clockwise direction until camshaft and crankshaft timing marks are aligned.
Ensure slack in timing chain is above tensioner assembly, then remove chain tensioner. The timing chain must be disengaged from grooves in tensioner shoe to permit removal of shoe. Position a suitable screwdriver under timing chain while pulling shoe outward. If difficulty is encountered in removing tensioner shoe, proceed as follows:
Lower vehicle, then while holding the intake camshaft sprocket with J-39579, remove sprocket bolt and washer.
Remove washer, then install bolt into camshaft by hand.
Position a suitable three jaw puller into intake camshaft sprocket relief holes and remove sprocket. CAUTION: Do NOT pry on camshaft sprocket as damage to sprocket or timing chain housing may result.
Tensioner assembly attaching bolts and tensioner assembly.
MARK CRANKSHAFT SPROCKET AND TIMING CHAIN outer surface for reassembly.
Timing chain.
INSTALL OR CONNECT
Intake camshaft sprocket onto camshaft with surface marked during removal showing.
Intake camshaft sprocket retaining bolt and washer, torque to 70 Nm (52 ft lbs) while holding the sprocket with J-39579 (if removed).
Timing pins, J-36008, through holes in camshaft sprockets into holes in timing chain housing to position camshafts for proper timing. If camshafts are out of position and must be rotated more that 1/8 turn to insert timing pins:
Crankshaft MUST be rotated 90°clockwise off of TDC in order to give the valves adequate clearance to open.
Once the camshafts are in position and the timing pins have been installed rotate crankshaft COUNTERCLOCKWISE to TDC. CAUTION: Do NOT rotate the crankshaft clockwise to TDC, valve or piston damage could occur.
Timing chain over exhaust camshaft sprocket, around idler sprocket and around crankshaft sprocket.
Set camshaft sprockets at timed position and install timing chain. Remove timing pin from intake camshaft. Using J-39579, rotate the intake camshaft sprocket counterclockwise until timing chain can be installed over sprocket. Release J-39579 after timing chain has been installed over sprocket. The length of chain between intake and exhaust camshaft sprockets should tighten. The timing pin should easily fit through intake camshaft sprocket timing hole into timing chain housing timing hole. If timing pin does not fully index, the camshafts are NOT timed correctly and the procedure MUST be repeated.
With timing pins installed, raise and support vehicle.
With slack removed from timing chain between intake camshaft sprocket and crankshaft sprocket, timing marks on crankshaft and engine block should be aligned. If the marks are not aligned, move timing chain one tooth forward or rearward to align marks. Remove slack and recheck marks.
Reload tensioner assembly to zero position as follows:
Form a keeper out of heavy gauge wire into a U-shaped piece with a half inch opening.
Apply slight force on tensioner blade to compress plunger.
Insert small screwdriver into reset access hole and pry rachet pawl away from ratchet teeth while forcing the plunger completely in the hole.
Install keeper between access hole and blade.
Tensioner assembly to chain housing and recheck plunger assembly installation, noting long end is toward crankshaft.
Lower vehicle to point where timing pins can be removed from camshaft sprockets.
Rotate crankshaft two revolutions in the clockwise direction. Align crankshaft keyway with the mark on cylinder block and reinstall timing pins through camshaft sprockets into housing timing holes. Timing pins should slide easily through timing holes. If timing pins cannot be inserted easily, repeat procedure to properly time engine. CAUTION: If the engine is not correctly timed, severe engine damage could occur.
CAUTION: The bolts are different lengths and must be returned to their original location.
![2010&c18=modelyear&c20=n310677&c35=wsm%2ctiming%20drive%20components%2csxj%2c303-01b%2cin-vehicle%20repair&s=1600x900&c=32&j=1.3&v=y&k=y&bw=1171&bh=582&ct=lan&hp=n&[aqe]](/uploads/images/2010&c18=modelyear&c20=n310677&c35=wsm%2ctiming%20drive%20components%2csxj%2c303-01b%2cin-vehicle%20repair&s=1600x900&c=32&j=1.3&v=y&k=y&bw=1171&bh=582&ct=lan&hp=n&[aqe])
×