Oil Pan 1998 k2500 7.4 liter engine

This is a very involved project. Here is what the manual says:

Oil Pan Replacement Oil Pan Replacement Removal Procedure

1. Disconnect the negative battery cable.
2. Install the engine support fixture.
3. Raise and support the vehicle.
4. Drain the crankcase.
5. Remove the right front tire and wheel.
6. Remove the right front splash shield.
7. Remove the wheel speed sensor harness from the right suspension support.
8. Remove the right front ball joint, bolt, and nut. Separate the ball joint from the steering knuckle.
9. Remove lower closeout panel.

Remove the air conditioning (A/C) compressor bolts and position the compressor aside.

10. Remove the braces that support the engine to the transmission.
11. Remove the starter.
12. Disconnect the oil level sensor.
13. Remove the retainers that secure the brake line to the frame.
14. Remove the right side engine mount nuts and bolts.
15. Loosen the left side cradle bolts.
16. Remove the frame bolts from the right front and the right rear.

Remove the oil pan side bolts.

17. Remove the oil pan bolts.
18. Remove the oil pan.
19. Remove the oil pan gasket.

Depends on what vehicle you have. Most pumps can be changed by dropping the oil pan. It may require raising the engine somewhat for the pan to clear the sump. Some vehicles have the oil pump run off the crankshaft on the side of the engine as well and are easier to access and change

REMOVAL PROCEDURE

1. Remove the oil level indicator tube.
2. Raise the vehicle.
3. Remove the engine oil and the engine oil filter.
4. Remove the oil filter adapter.
5. Remove the starter.
6. Remove the flywheel inspection cover.
7. Remove the engine mount through bolts.
8. Raise and support the engine.

1. Remove the oil pan nuts and bolts. Note the location of any studs to assist reassembly.
2. Remove the engine oil pan and the gasket.
3. Clean all sealing surfaces. Refer to Oil Pan Clean and Inspect under Engine Unit Repair.

INSTALLATION PROCEDURE

1. Install the engine oil pan and a NEW gasket. Refer to Oil Pan Installation under Engine Unit Repair.
2. Lower the engine onto the mounts.
3. Install the engine mount through-bolts.
4. Install the starter.
5. Install the flywheel inspection cover.
6. Install the engine oil filter and the engine oil.
7. Install the oil filter adapter.
8. Install the oil level indicator tube.

need motor 4cy or 6cy

Yes you can do it yourself.
Its not very easy,but with basic Auto repair tools the task can be easily completed.

=========
There are few help links with solutions to complete these task.
I suggest you to refer these links and view its procedure.

-------
Click the link below:----
------------
How to Replace an Oil Pan Gasket?
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-oil-pan-gasket.html
-----------
KIA Sportage leaking oil from oil pan?

Go to Newly Launched

FREE Car repair guobyme.blogspot.com/2011/11/kia-sportage-leaking-oil-from-oil-pan.html" http://howtobyme.blogspot.com/2011/11/kia-sportage-leaking-oil-from-oil-pan.html
----------------
Oil pan Gasket on 1998 Toyota Tercel?
http://howtobyme.blogspot.com/2011/11/oil-pan-gasket-on-1998-toyota-tercel.html
-------------
VALVE COVER GASKET REMOVAL GUIDE http://technoanswers.blogspot.in/2012/06/valve-cover-gasket-removal-guide.html
--------- Car oil leaks from valve cover gasket? http://schematicsdiagram.blogspot.com/2011/12/car-oil-leaks-from-valve-cover-gasket.html

------------
How to replace Oil Pan on 2008 Honda Odyssey?

http://schematicsdiagram.blogspot.com/2011/12/how-to-replace-oil-pan-on-2008-honda.html

-----------
How to replace Oil Pressure Sensor on 2008 Honda Odyssey?

http://schematicsdiagram.blogspot.com/2011/12/how-to-replace-oil-pressure-sensor-on.html

------------
2004 Chevrolet Express Van: Oil pressure sending unit replacing? http://whoisbyme.blogspot.in/2012/06/2004-chevrolet-express-van-oil-pressure.html
-------------
HOW TO REPLACE AN OIL PUMP
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-oil-pump.html
-------------
HOW TO CHANGE ENGINE OIL AND FILTER
http://schematicsdiagram.blogspot.com/2011/07/how-to-change-engine-oil-and-filter.html
--------------
HOW TO REPLACE AN OIL PRESSURE SWITCH (SENSOR)
http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-oil-pressure-switch.html

-------------

How to Check Differential Oil Leaks and Replace Oil
http://schematicsdiagram.blogspot.com/2011/07/how-to-check-differential-oil-leaks-and.html
-----------
HOW TO PERFORM A BASIC ENGINE TUNE UP-OIL CHANGE
http://schematicsdiagram.blogspot.com/2011/08/how-to-perform-basic-engine-tune-up-oil.html

----------
HOW TO RESET OIL CHANGE INDICATOR? http://whoisbyme.blogspot.in/2012/07/how-to-reset-oil-change-indicator.html

------------
These details will help.
Thanks.

1994-96 VEHICLES
( see Figures 6 and 7 / click image for zoom )

Fig. 6: Oil pan mounting bolt locations-1996 3.1L engine shown

Fig. 7: Oil pan sealant application points-1996 3.1L engine shown

1. Disconnect the negative battery cable.
   

It may be necessary to remove the hood, with the help of an assistant, for access.

1. Remove the engine mount strut and A/C compressor (if equipped) and the engine mount strut bracket assemblies.
   
2. Remove the electric cooling fan assemblies. -28467 and J 26462, or equivalent.
   
3. Raise and safely support the vehicle. Drain the engine oil.
   
4. Remove the front exhaust manifold pipe.
   
5. Remove the intermediate shaft bolt/screw.
   
6. Remove the oil level sensor.
   
7. Remove the engine splash shield.
   
8. Suitable support the drivetrain and front suspension with jack stands.
   
9. Remove the transaxle mount side frame retaining nuts from the drivetrain and suspension frame assembly.
   
10. Remove the engine mount side frame nuts from the drivetrain and suspension frame assembly.
    
11. Unfasten the rear drivetrain and front suspension frame bolts/screws.
    
12. If equipped, remove the lower drivetrain and front suspension frame bolts/screws.
    
13. Remove the engine mount assembly.
    
14. Remove the flywheel inspection cover.
    
15. Remove the starter.
    
16. Disconnect the transaxle mount assembly from the oil pan.
    
17. Unfasten the side bolts and screws and the retaining bolts and screws, then remove the oil pan. Remove and discard the oil pan gasket.

To install:

1. Clean the gasket mating surfaces.
   
2. Apply a small amount of sealer on either side of the rear main bearing cap, where the seal surface on the cap meets the cylinder block. Install a new gasket on the oil pan.
   
3. Position the oil pan and secure with the retaining bolts and screws. Tighten the retaining bolts and screws to 18 ft. lbs. (25 Nm) and the side bolts/screws using tool J 39505 or equivalent.
   
4. Fasten the transaxle mount assembly to the oil pan.
   
5. Install the starter motor.
   
6. Install the flywheel inspection cover.
   
7. Install the engine mount assembly.
   
8. Carefully raise the drivetrain and front suspension assembly. Install the rear drivetrain and front suspension frame bolts/screws.
   
9. Fasten the engine mount frame side nuts to the drivetrain and front suspension frame assembly. Install the transaxle mount frame side nuts to the drivetrain and suspension frame assembly.
   
10. Remove the jackstands from the drivetrain and front suspension frame assembly.
    
11. Install the engine splash shield and the oil level sensor.
    
12. Install the intermediate steering shaft bolt/screw. Connect the front exhaust manifold pipe.
    
13. Carefully lower the vehicle.
    
14. Remove the engine support tools.
    
15. Install the electric cooling fan assemblies.
    
16. Install the engine mount strut and A/C compressor, bracket and the engine mount strut bracket.
    
17. If removed, install the hood assembly.
    
18. Fill the crankcase to the correct level. Connect the negative battery cable. Run the engine to normal operating temperature and check for leaks.

Hope this helps (remember to rate this answer).

Step 1 Raise the truck using the proper equipment. Use a ramp or a jack and jack stands to support the vehicle securely by following all directions for use provided by this equipment's manufacturer.

Step 2 Drain all oil from the Silverado by placing an oil drip pan under the vehicle's engine block, directly under the oil drain plug. The drain plug is located on the oil pan, between the vehicle's tires underneath the vehicle. Use a wrench to loosen and remove the plug allowing the oil to drain into the pain below.

Step 3 Notice the various items attached to the oil pan or in the way of the oil pan dropping. For the oil pan to drop, remove the negative battery cable, front differential (only for four-wheel drive vehicles) and the under body shield by using a wrench or socket set.

Step 4 Remove the oil pan shield by loosening the four bolts holding it in place along the edges of the shield. Then, remove the cross brace, oil filter, the transmission to oil pan bolts and the oil level sensor.

Step 5 Follow the removal of those pieces by removing the bolts from the two front wiring harness, the engine wiring harness retainer, engine oil cooler pipe to oil bolts and the transmission oil cooler pipe retainer using a wrench. Located the closeout covers and bolts located on each side of the engine and remove them.

Step 6 Disconnect each of the oil pan bolts using a wrench that will allow the oil pan to drop. The oil pan gasket will also fall off and replacement should occur before reinstalling the oil pan.

Read more: How to Drop the Oil Pan in a Chevy Silverado | eHow.com http://www.ehow.com/how_4508109_drop-oil-pan-chevy-silverado.html#ixzz0wi82Ul2u

when changing the filter? maybe 4, at overhaul maybe 10-11?

After getting all oil,oil filter and oil catch pan if I havent bought one, I warm my vehicle for a few min to get teh oil flowable. then raise the front end and locate the drain plug on the oil pan. Place an oil catch pan (5-8.00 @ most stores) under the oil pan and carefully remove the drain plug. I then lower the vehicle and wait till all oil is removed. Raise the vehicle tehn replace oil drain plug and tighten, careful not to over tighten, then slid the oil catch pan under the oil filter and remove the oil filer, some oil will spill here so rubber gloves and papper towels come in handy for this part. Lay the old oil filter on the oil catch pan to allow the old oil to drain while relacing with new oil filter. I rub a thin film of oil on the rubber seal of the oil filter before threading back onto the engine. lower vehicle and add new oil as needed. start vehicel then check for any leaks then shut off engine and check oil level and add more if needed. I then poor the oil oil in the empty oil container so I can drop off at wal mart or other oil recycling center.

here's v6 3.8L

Section 03-01A: Engine, 3.8L 1996 Thunderbird, Cougar Workshop Manual
IN-VEHICLE SERVICE Oil Pan/Oil Pump Screen Cover and Tube Removal

1. Disconnect battery ground cable (14301).
   

1. Remove air cleaner outlet tube (9B659). Refer to Section 03-12 .
   

1. Remove two bolts retaining radiator upper sight shield (8C291) and position radiator upper sight shield aside.
   

1. Remove hood weather seal.
   

1. Remove windshield wipers.
   

1. Remove LH cowl vent screen and wiper module.
   

1. Install Three Bar Engine Support D88L-6000-A or equivalent.
   

1. Raise vehicle on a hoist. Refer to Section 00-02 .
   

1. Remove front engine support insulator through-bolts.
   

1. Partially lower vehicle.
   

1. Raise engine and support with Three Bar Engine Support D88L-6000-A or equivalent.
   

1. Raise vehicle.
   

1. Remove starter motor (11002).
   

1. Position drain pan.
   

1. Drain engine oil.
   

1. Remove oil bypass filter (6714).
   

1. Remove starter motor wire, ground strap and automatic transmission oil cooler lines.
   

1. Remove oil pan-to-bell housing bolts and bolts at crankshaft position sensor lower shield.
   

1. Remove remaining oil pan retaining bolts.
   

1. Remove steering shaft pinch bolt and separate steering shaft.
   

1. Position transmission jack under front sub-frame (5C145).
   

1. Remove six rearward bolts on front sub-frame. Loosen two forward front sub-frame bolts.
   

1. Remove lower shock absorber-to-front suspension lower arm bolts and nuts (both sides).
   

1. Lower front sub-frame.
   

1. Remove oil pan (6675).
   

1. Empty any residual oil from oil pan.
   

1. Remove oil pump screen cover and tube retainer bolts and support bracket nut. Remove oil pump screen cover and tube (6622) and discard oil pump inlet tube gasket (6626).