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Well we got the engine running pretty good today and finally moved it under it's own power :cry: .
We checked constantly while it was idling for leaks and there was none. seems like once we moved it something happened to make it leak.
Before I rebuilt the engine it leaked from the rear seal and I figured it was because the crankshaft thrust washer was missing allowing the crank to move back and forth.
I replaced the rear main seal with a new one and put in new thrust bearings which put the crankshaft end play back in specs.
I was wondering if anyone else ever replaced the seal and if there is anything I should watch out for when I replace it again?
I have rebuilt too many engines to list and have never had this happen before, very frustrating .
I am going to pull the engine again next weekend and check to see if it might have tore when I put the flywheel back on.
On a positive note though, everything is very clean and has new bolts in it so it should come apart pretty easy.

John

My friend the Hercules parts guy said people were having problems with the seals from Zimmermans, because they're plastic on the outside. I guess they pop out of place. I have never used one, altho I have one to put in a tractor. Maybe thats your problem.

Bob

I bet your right! I was just talking to my son and told him I have a feeling the seal popped completely out because when i put the seal in it just didn,t seem right. guess i should have trusted my gut feeling . If the seal is not damaged i may try using some type of adhesive to hold it in.

John

When I put mine in I think I'm gonna use Loctite or something similar on it. Hopefully thats the problem so it will be somewhat easily fixed.

Bob

Well any luck on finding the problem yet?

Yeah, sons and I removed engine and flywheel yesterday.  The rear seal was not all the way seated and was leaking oil where the seal meets the housing.  The seal was slightly damaged because it wasn't properly seated.  Ordered a new one today.  Should have it back together this weekend.
John

Well I'm glad to hear that thats all it was and not a major problem. I know it sucks having to tear it all back apart, trust me I've been there.

Bob

I'm glad that's all it was too.  I had visions of crankshaft damage or pieces of flywheel missing.  I was thinking the worst, but praying for the best.  Seal came in today so should have it back together this weekend.  However, won't be able to start it yet because my son is setting the opening pressure on each injector at his vo-tech school (he's taking diesel mechanics.)
John

I put my new seal in the other day and used red loctite on it. Don't know if its gonna stay, but have a good feeling that it isn't moving.

It wouldn't hurt to have those injectors set a little less that the book says. It makes up for worn timing gear/chain parts ect. Its a little easier on the pump too because they're so old. I have the specs if they aren't in the book.

The book I have sets the injector opening pressure at 1650. How far from the 1650 psi the book gives could I set the pressure , before any problems arise?

John

Quote from: "dadjon"The book I have sets the injector opening pressure at 1650. How far from the 1650 psi the book gives could I set the pressure , before any problems arise?

John

I think I would stick with what the book says John. If you pump is healthy, I think you'll be just fine. I know we backed off the injector pressure on a well-worn Mercedes because the pump was tired and it always missed on idle, but if your pump is good, I would set it up like it's supposed to be.

Blake

I don't know how far mine on my AD are backed off, and you have see how it runs. I would think 50 or 100 psi. Maybe it won't make that much of a difference...