About to go nuts over rear leak on 641

anwalker · Jul 17, 2016

Just restored my grandfather's 641 and just about finished with exception of rear engine oil leak. I used the paper wedge seals and I thought they swelled too fast and didn't seat all the way so I dropped the pan, verified the neoprene seals were installed in the correct orientation and removed the paper seals. Cleaned everything up then applied a little moto 1 to the mating surfaces and reinstalled the block. I then forced ultra grey into the cavity and stuffed with ultra grey coated cotter rope. I saw sealer extrude out the sides of the bearing block and cleaned up the excess. Started her up and it ran fine for 20min no leaks. Took it around the yard and it's dumping oil again. I noticed the oil was overfilled about an 1/8" above the line and drained the excess, still leaking. My oil pressure is about 55psi at rpm and only drops to 45 or so idling. I'm ready to be finished with this project and only live a hour from Hobo. May need to pay him a visit.

anwalker · Jul 17, 2016

So here's what I know:
At idle or rpm in neutral on a cold or warm motor no leaking.
Under load and normal operating temp, leaks like crazy
I only see the oil coming from the area between the motor and bell housing cover
Crank was ground at a very good shop and they did a good job cleaning the sealing surfaces.
I'm almost wondering if the cam cover is leaking?

Mike Groom · Jul 17, 2016

Was the engine recently overhauled? I had a like problem on a Ford engine and it was leaking from the fly wheel bolts,I had to remove
the fly wheel and put sealer on the threads because they went through into the oil pan on the crank flange.

anwalker · Jul 17, 2016

(quoted from post at 16:04:04 07/17/16) Was the engine recently overhauled? I had a like problem on a Ford engine and it was leaking from the fly wheel bolts,I had to remove
the fly wheel and put sealer on the threads because they went through into the oil pan on the crank flange.

That's very possible. I didn't seal those bolts.

anwalker · Jul 17, 2016

(quoted from post at 16:04:04 07/17/16) Was the engine recently overhauled? I had a like problem on a Ford engine and it was leaking from the fly wheel bolts,I had to remove
the fly wheel and put sealer on the threads because they went through into the oil pan on the crank flange.

That's very possible. I didn't seal those bolts but shouldn't I see the oil coming from the bell housing drain if that was the case?

About to go nuts over rear leak on 641

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