What is the head bolt torque on a 1990 suzuki lt250r quadracer changing head gasket had head resurfaced need to know the proper torque thank you just put in rm 250 no category for atv
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Firstly the sort of crack cylinder heads suffer from are most often not visible which is why pressure testing is important especially if the previous blown gasket had resulted in a nearly cooked engine.
Uneven heating of a metal mass will always cause distortion and uneven cooling often causes a crack - this is often the consequence of leaving a failing head gasket until it has failed.
It isn't unknown for the top of a cylinder block to need attention due to corrosion or warpage. It isn't unknown for a cylinder block to crack, it also isn't unknown for head bolts to stretch and bottom in the holes especially when the head has been skimmed...
It isn't unknown for amateur mechanics to misinterpret the cylinder head bolt tightening method when it uses a mixture of conventional torque wrench and angular torquing.
white smoke means there is a presence of water/coolant at your combustion chamber. common cause of this is blown head gasket and/or small cracks/holes in your cylinder head. if this happens, water will not circulate properly in your engine thus the vehicle will shutdown due to over heating.
what to do: 1. replace head gasket. this is quite not a DYI fix since it will require some tools like torque wrenches and some knowledge on timing. 2. if replacing the head gasket does not solve your problem, have your cylinder head resurfaced at the nearest car service center. resurfacing makes sure that your cylinder head perfectly fits with the crank case.
Yes, you can just do one head gasket, although I wouldn't recommend it. If the head gasket has failed, it's usually because the engine has overheated. If you know that the engine has overheated, it would be best to do both heads. When an engine overheats, the head warps a little. It doesn't take much to change the internal pressures on the gasket, and when the gasket area between the cylinders starts to lighten up a little, the gasket fails. To do the job properly, take the head(s) to a qualified automotive machine shop and have the head resurfaced. Even a slightly warped head will be unable to keep a head gasket. After a head has been resurfaced, it's relatively easy to put it back together. NOTE!! The machine shop will tell you the proper torque and torque sequence. Usually start from the center and work your way out evenly, going from side to side, and top to bottom, but get specific information for YOUR engine from the machine shop. NEVER replace a head gasket without having the head resurfaced.
to "fix" a head gasket requires taking off the cylinder head and associated compnents, getting the cylinder head serviced to ensure flat surface and no cracks, reaplcing the head gasket, and reassembly ensuring the proper torque of all bolts, especially head bolts........what makes you belive the head gasket requires fixing
REMOVAL & INSTALLATION NOTE: The manufacturer recommends that the entire powertrain be removed from the vehicle before removing the cylinder heads.
Before servicing the vehicle, refer to the precautions in the beginning of this section.
Drain the cooling system.
Properly relieve the fuel system pressure.
Remove or disconnect the following:
Negative battery cable
Powertrain assembly
Intake manifold
Cam covers
Harmonic balancer
Timing chain front cover
Oil pump
WARNING Align all timing marks before performing the next step.
Chain tensioner from the timing chain
Cam sprockets
NOTE: The timing chain remains in the chain case.
Timing chain guides, access for the retaining screws is through the plugs at the front of the cylinder head
Water crossover
Exhaust manifold
Cylinder head bolts by reversing the torque sequence
Cylinder head and discard the gasket
WARNING With the camshafts remaining in the cylinder head some valves will be open at all times. Do not rest the cylinder head on a flat service with the cylinder face down, or valve damage will result.
NOTE: Clean all gasket mating surfaces. Clean the head bolt holes in the crankcase. WARNING Be careful when cleaning aluminum gasket surfaces to prevent damage to the sealing surfaces.
Check the cylinder head for warpage; it must be less than 0.002 in. (0.05mm). If the cylinder head was resurfaced, the dimension between the combustion chamber gauge pad and the deck surface must be at least 10.5mm.
To install:NOTE: Refer to Section 1 of this manual for the cylinder head torque sequence illustration. The illustration is located after the Torque Specification Chart.
Install or connect the following:
New cylinder head gasket
Cylinder head, lubricate the bolts with engine oil
Torque the M11 bolts, in sequence, as follows:
Step 1: 22 ft. lbs. (30 Nm).
Step 2: Turn an additional 60 degrees.
Step 3: Turn an additional 60 degrees (total 180 degrees).
Torque the M6 bolts to 106 inch lbs. (12 Nm).
Set the camshaft timing
Camshaft guide bolt access hole plugs in the cylinder heads. The plugs should be seated and snug
Install or connect the following:
Intake cam covers
Oil pump
Timing chain front cover
Harmonic balancer
Cam sprockets
Chain tensioner to the timing chain
Timing chain guides
Intake manifold
Water crossover
Exhaust manifold. Torque the nuts to 22 ft. lbs. (30 Nm) or the bolts to 18 ft. lbs. (25 Nm).
Powertrain assembly
Negative battery cable
Fig. 1: Minimum head resurface dimension
New cylinder head bolts coated with a sealant (such as GM 1052080). Torque the bolts in the proper sequence (1-8) to 37 ft. lbs. (50 Nm). Using a torque angle meter turn the bolts 90 degrees in the proper sequence.
Left side exhaust manifold. Torque the bolts to 12 ft. lbs. (16 Nm).
Spark plugs. Torque the plugs 11 ft. lbs. (15 Nm).
Right side rear cylinder head:
Cylinder head bolt torque sequence—3.4L engine
New cylinder head gasket
Cylinder head on top of the gasket and make certain it is lined up properly with the dowel pins
New cylinder head bolts coated with a sealant (such as GM 1052080). Torque the bolts in the proper sequence (1-8) to 37 ft. lbs. (50 Nm). Using a torque angle meter turn the bolts 90 degrees in the proper sequence.
Right side exhaust manifold. Torque the bolts to 12 ft. lbs. (16 Nm).
Spark plugs. Torque the plugs 11 ft. lbs. (15 Nm).
Spark plug wires
Exhaust crossover pipe. Torque the fastener to 18 ft. lbs. (25 Nm).
Valve rocker arms and pushrods. Torque the fastener to 89 inch lbs. (10 Nm). Using a torque angle meter torque the fastener an additional 30 degrees.
Lower intake manifold. Torque the bolts to 115 inch lbs. (13 Nm).
Upper intake manifold. Torque the bolts to 18 ft. lbs. (25 Nm).
Here you go, I hope this is what you were looking for:
For 1987-94 models, the cylinder head bolts are tightened in 3 progressive steps. Tighten them in the proper sequence as follows: Step 1: 50-55 ft. lbs. (68-75 Nm)Step 2: 60-65 ft. lbs. (81-88 Nm)Step 3: 70-85 ft. lbs. (95-115 Nm)
Let me know if I can assist you with anything else.
Head Bolt Torque
For your 1994 Oldsmobile Cutlass Supreme (3.4L SFI DOHC):
Foot pounds (Final torque)
Note:
Torque sequence --------- | 6 2 3 7 | | 5 1 4 8 | --------- Step 1: torque in sequence to 33 Ft/Lbs Step 2: turn an additional 90 degrees Recheck final torque in sequence *** CAUTION ***engine uses Torque To Yield head bolts (TTY) thatpermanently stretch during the initial installation.New head bolts must be used when cylinder head isreplaced or re-installed to obtain proper torque.
Foot pounds (Final torque)
Note:
Torque sequence --------- | 8 4 1 5 | | 7 3 2 6 | front --------- of engine | 6 2 3 7 | | 5 1 4 8 | Step 1: torque to 40 Ft/Lbs --------- Step 2: turn an additional 90 degrees Recheck final torque in sequence *** CAUTION ***engine uses Torque To Yield head bolts (TTY) thatpermanently stretch during the initial installation.New head bolts must be used when cylinder head isreplaced or re-installed to obtain proper torque.
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