Rear Main Seals

[frnkeore]

My 36/37 (68) engine has double slinger seals. How well will they work, best case and worst case.

I know that you can cut one of them off and use a rope seal but, if they will work, reasonably well, I'd like to retain them.

Frank

[JSeery]

They work as good now as they did when they were designed. As long as there is not pressure inside the crankcase blowing oil past the slingers they work fine. You may get a small amount of oil around them, that is what the hole in the back part of the oil pan with the cotter pin in it is for. Over filling the oil can also become an issue.

[frnkeore]

It will be a rebuilt engine so, no blow by, to speak of. It would turn 3000+ rpm, when driven, on outings. Would there be any crankshaft windage pressure at that rpm?

Would everyone know where I parked?

Would it loose 1/2 qt in 3000 miles?

[Talkwrench]

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Old design, they leak a bit plain and simple. I drive mine every day few drips here few drips there, just the way it is, same as the trans. I didn't use the drain tube off the rear main cap. Will it lose oil? well if its a good engine then between oil changes you should notice it at all I never have. Are you going to do the 90% oil filter modification for it, go the full 100% or nothing? I dont think theres a day go by without me pushing mine past 3000rpm at some point , I pulled 65mph out of second pretty easy a few weeks back , I have a 33 steel cam in mine.