The oil pan (Fig. 1) may be made of steel, cast iron, or cast aluminum. A shallow or deep sump-type oil pan is
used, depending upon the particular engine application. A one-piece oil pan gasket is used with stamped steel
pans. A four-piece gasket is used with the cast oil pans.
Removing and Installing Oil Pan
On some engine applications, it may be possible to remove the oil pan without removing the engine. It is
recommended that if the engine is to be removed, the oil pan be left in place until the engine is removed.
The procedure for removing the oil pan without taking the engine out and after taking the engine out of the unit
will vary. However, the following will generally apply.
1. Remove the drain plug and drain the oil.
2. Detach the oil pan; take precautions to avoid damaging the oil pump inlet pipe and screen.
3. Remove the oil pan gasket completely.
4. Clean all of the old gasket material from the cylinder block and the oil pan. Clean the oil pan with a
suitable solvent and dry it with compressed air.
5. Inspect a cast oil pan for porosity or cracks. Check a stamped oil pan for dents or breaks in the metal
which may necessitate repair or replacement. Check for misaligned flanges or raised surfaces surrounding the
boltholes by placing the pan on a surface plate or other large, flat surface.
Figure 1. Typical Oil Pan
6. When installing the oil pan, use a new gasket and, starting with the center bolt on each side and
working alternately toward each end of the pan, tighten the bolts to 10-20 lb ft (14-27 Nm) torque. DO NOT
overtighten the bolts. Once the bolts are tightened to the specified torque, do not retighten them as it could be
detrimental to the current-type gaskets. If a leak should develop at the oil pan, check if the lockwasher is
compressed. If not, the bolt may be tightened. However, if the lockwasher is compressed and leaking occurs,
remove the oil pan and determine the cause of the leakage.
Current oil pan bolts (stamped metal pans) are coated with a locking material. To reactivate the locking ability
of the bolts, apply a drop or two of Loctite J 26558-242, or equivalent, to the threads of the bolts at reassembly.
7. Install and tighten the oil drain plug. Tighten the plug (with nylon washer) to 25-35 lb ft (34-47 Nm)