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Jack up truck for safety sake put jack stands under frame . remove all engine oil remove all bolts holding oil pan on if their is not enough room to drop pan you may have to remove bolts holding motor mounts and jack up engine. if front end linkage is still in the way remove linkage. pull oil pan out. check gasket that was between block and oil pan if any stuck to block of engine remove with gasket scraper or wire brush or wire wheel on drill.make sure mating surface is clean put new gasket on new oil pan I like to use a high temp sealer on gasket both sides. Put pan with gasket back in place of old oil pan and tighten all bolts. jack engine down ,replace moter mount bolts replace any linkage you took apart. and dont forget to replace engine oil. make sure oil plug is in pan before pouring oil in . before starting engine check that no oil is leaking than start engine and check for any leaks again if all is good your done. if this was helpful please leave good feed back. A good temp fix on a rusted oil pan is JB weld make sure no oil is on pan clean with towel and rubbing alchol .you may have to drain oil first. if it is rusted badly you may have to use a wire brush on a drill to clean the area to patch. if patched properly it may last for years.
TRANSMISSION FLUID LEAKS,CAN BE FOUND AROUND PAN GASKET.CHECK PAN GASKET,IF IT LOOKS WET AND YOU SEE FLUID DRIPPING AROUND THE EDGE OF OIL PAN, REPLACE PAN GASKET, WHILE YOU REPLACING PAN GASKET REPLACE TRANSMISSION FILTER WHILE OIL PAN OFF.IF TRANSMISSION OIL PAN NOT LEAKING, CHECK TRANSMISSION OIL COOLER LINES GOING INTO RADIATOR YOU WILL LOOSE A LOT OF FLUID THERE ALSO TORQUE SHAFT SEAL WILL CAUSE HEAVY FLUID LEAK WHILE ENGINE RUNNING CHECK OIL COOLER LINES AND LOOK AT THE TORQUE AREA WHILE ENGINE RUNNING YOU WILL SEE FLUID POURING WHILE ENGINE RUNNING THE OIL PUMP PRESSURE WILL PUSH FLUID OUT AT THE LEAKING AREAS.
oil leaking anywhere on the engine runs down and gets caught on the oil pan lip, builds up runs over and then looks to be an oil pan leak. so what you do is take the thing to a shop with a lift, like an oil change or muffler shop, and ask them to put it up on the lift so the rest of the engine can be easily examined for leaks. if there is no other place above the oil pan with a thin layer of oil on it, then most likely the pan gasket is leaking. before you buy the gasket take a good look at any suspension hardware which could obstruct easy removal of the oil pan. it may require lifting the engine up out of its mounts to get the gasket replaced, so simply snugging up the bolts holding the pan on and living with a small leak may be the way to go.
The only thing you can do if its welded there is cut the catalytic converter pipe and weld it back together when your done. Keep in mind that you want to try and cut the pipe in the easiest place that you will be able to weld it back together.
Before servicing the vehicle, refer to the precautions in the beginning of this section.
Drain the crankcase.
Remove or disconnect the following:
Negative battery cable
Oil level indicator harness connector, if equipped
Exhaust Y-pipe, if needed
Transaxle assembly from the vehicle.
Oil pan bolts and the oil pan
To install:NOTE: The oil pan gasket is reusable unless it is damaged. Do not remove the gasket from the oil pan groove unless gasket replacement is required.
Thoroughly clean the inside of the oil pan and the cylinder block contact surface. If the oil pan gasket is being reused, be careful not to damage it. Do not expose the gasket to cleaning solvents.
If a new gasket is being installed, start the gasket into the oil pan groove and work the gasket into the groove in both directions. Once the gasket is exposed to oil, it will expand and no longer stay in the groove without wrinkles. If this condition exists, replace the gasket.
Install or connect the following:
Oil pan. Torque the bolts, in sequence, to 89 inch lbs. (10 Nm).
Oil level indicator connector, if removed
Transaxle assembly, if removed
Y-pipe, if removed
Flywheel cover, if removed
Oil pan drain plug. Torque it to 15 ft. lbs. (20 Nm).
Negative battery cable
Refill the crankcase.
Run the engine and check for leaks.
Fig. 1: Oil pan bolt torque sequence