| Chrysler Engine >> REAR MAIN SEAL LEAKS ON 1986 & LATER ENGINES |
Rear Main Crankshaft Seal Leaks On
1986 And Later Chrysler 5.9L (360 CID) Engines
The rear main crankshaft seal bore on some Chrysler 5.9L (360 CID) engines built after 1986 may not be concentric with the centerline of the main bearing bore.
This causes irregular contact between the rear main seal and the crankshaft, leading to oil leaks at the rear of the engine. Depending on position, the seal may barely make contact with the crankshaft or may be flattened because of the closeness of the crankshaft seal surface.
Chrysler Corporation has released a Viton rear seal, Part #4483456, replacing Part #4240101, that should be used in this situation. The number on the seal itself is 501473.
At the present time aftermarket gasket manufacturers are packing the former Polyacrylate rear main seal with their gasket sets, which should work well in most applications. However, install the Viton seal whenever a cylinder block with a non-concentric rear main crankshaft seal housing bore is used.
The AERA Technical Committee
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