Re: 15W40 in an old engine?

Posted by Bob on September 25, 2005 at 19:16:20 from (64.21.249.40):

In Reply to: Re: 15W40 in an old engine? posted by txgrn on September 25, 2005 at 17:56:39:

TX,

Generally, the engine oil pressure is NOT directly applied to the rear main seal.

Typically, there is an oil slinger on the crankshaft that throws any oil that flows out the back of the main bearing outward, into a large groove that is open to the crankcase, allowing the oil to freely return to the crankcase.

So, the "mechanical labyrinth seal" (the oil slinger) effectively separates the oil flow from the main bearing from the rear main seal, so increased oil pressure shouldn't be a factor in more leakage from the rear main seal.

Furthermore, thicker oil increases oil pressure because there is LESS flow of the higher viscosity oil through the bearings.

Therefore, with a given engine, with a certain oil clearance at the rear main bearing, increased viscosity = less flow through the bearing = less oil the slinger, and then the rear main seal have to deal with.

I suspect when the OH'd it, they did not get the rear seal in correctly, or didn't get the rear main cap or seal holder properly sealed to the engine.

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