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The gasket set would most likey have the rear main seal. But - before you condemn the seal, I would recommend starting with the oil pan gasket. I had one that was puking and I thought it was the rear main, but it only turned out to be the pan gasket. Also, the rear main is a pain. It is a rope type seal, 2 pieces. To replace the lower piece of the seal, you have to pull the main cap off the crankshaft. And then stuff that thick rope seal into the tiny grove in the main cap. And, if the upper piece of the seal has to be replaced, you have to pull the crank shaft out of the engine. So, you want to hope it's just the pan gasket. Typically, the rear main seal does not leak on the Patrols - unless perhaps someone has had the crank out and replaced the seal incorrectly. |
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Thank you very much for the advice, its extremely helpful to have those tips, I am going to start on it in the next couple of days, I'll let you know how it went. THANKS AGAIN!! |
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Take into consideration that the rear oil seal of the crankshaft is a "wick or rope type" graphite impregnated seal. It comes in two halves. For a thorough installation, the crankshaft must be removed, so we are talking here for a complete disassembly of the engine. The bottom half can be replaced with the engine mounted. Modern auto technicians don't have a clue on how to change these seals. Here is a good link that describes the process: Good luck, Esteban |
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| I might also add that if it is the rear main seal leaking, but it only does it say at higher RPM's, then it is a good bet you have excessive blow-by or a poor pcv system. When I changed to a Weber carb, I had to lose the breather hose at the filter. I developed terrible rear main leakage at highway speeds, about a quart and a half over 50 miles. I decided that a proper pcv setup might help so I drilled and tapped a hole in my intake manifold straight down from the carb and installed a 5/16" barbed fitting. I drilled a hole in the valve cover the same thickness as the pcv gasket I chose. installed a valve and connected with hose, and what do you know? No more leakage. I covered the previous breather hole in the V.C. with a breather filter from the parts house. Good luck! |
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Good point! You could also just use a vented oil filler cap. I have a '65 Patrol that does not have the breather hose from the air cleaner to the valve cover (factory original) but the oil filler cap is vented to compensate for it. |
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I have both the front and rear main seal new if you are interested????? |
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The rear seal is a rope or wick type, consisting of two pieces of rope, with graphite impregnated asbestos. You can only change the bottom half without taking the whole engine apart. The upper half requires removing the crankshaft. Check this site for some tips on installing this type of seal: http://www.chevytrucks.org/tech/bobadler-1.htm The gasket set of a P40 engine will fit. Only the timing gear cover, and the water pump and thermostat gaskets are different. The rest are a perfect match. |
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