RE: [Chrysler300] oil leaking 392

["mgoodknight@xxxxxxxx" <mgoodknight@xxxxxxxx>]

There's no way you could ever see any part of the rear main crankshaft seal with the oil pan in place on the engine.  I think the "rope-like" gasket that Larry refers to must be the seal between the pan and the main bearing cap.  All of those that I've seen are of neoprene, but maybe can look rope-like when dirty and wet with oil.  You can have a leak there, Larry, but if you do I suspect a slight defect in the oil pan surface not properly prepared during the overhaul.  You should be able to repair that quite easily with the pan off.

Opinions differ about what kind of seal to use in the rear mains.  Most of the older engines were originally equipped with a rope type seal and they work very well and last a long time if properly installed.  Unfortunately a proper installation is a bit tricky and I think that's the main reason the rubber-lip seal is often preferred.  When a rope seal was used the crankshaft was usually knurled with helical grooves on the sealing surface and those grooves tended to accumulate surplus oil and sort of pump it back toward the sump in normal crankshaft rotation.  If you put a rubber-lip seal on that grooved surface you will almost certainly create a leak.  That rubber lip-seal needs a very smooth, almost polished finish to work effectively. 

Marshall Goodknight

Please note: message attached

From: "Gary Nelson" <gnelson@xxxxxxxxxxxx>
To: <JettLarry@xxxxxxx>, <chrysler300@xxxxxxxxxxxxxxx>
Subject: RE: [Chrysler300] oil leaking 392
Date: Sun, 11 Mar 2012 16:06:21 -0700
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