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ursus · 08-10-2019, 09:01 PM

The cork composition seals were a pinch seal and worked OK if carefully positioned but there was no allowance for wear so leaks were inevitable as wear progressed. The rope seal also worked if there was the appropriate amount of backing to support it in the oil slinger grooves. The backing was often composed of copper tubing pushed into the groove to the proper depth. The flathead Ford V-8 engines and most engines of that era used a rope seal, which was an improvement over the slinger concept.

The newer neoprene lip seals are an improvement provided they are carefully installed and one cannot be careful enough. Testing should be done with a 30-60ml syringe placed tightly into the rear main oil feed tube before the engine is buttoned up for installation.

08-10-2019, 09:01 PM	#9
ursus Senior Member Join Date: May 2010 Location: Oregon Posts: 1,375	Re: Rear Main Oil Leak The cork composition seals were a pinch seal and worked OK if carefully positioned but there was no allowance for wear so leaks were inevitable as wear progressed. The rope seal also worked if there was the appropriate amount of backing to support it in the oil slinger grooves. The backing was often composed of copper tubing pushed into the groove to the proper depth. The flathead Ford V-8 engines and most engines of that era used a rope seal, which was an improvement over the slinger concept. The newer neoprene lip seals are an improvement provided they are carefully installed and one cannot be careful enough. Testing should be done with a 30-60ml syringe placed tightly into the rear main oil feed tube before the engine is buttoned up for installation.