Rusty Driver
Posts: 147
Joined: Thu Aug 08, 2019 8:14 am
Location: Rostraver, Pennsylvania
Rear Main Seal Leak
I totally screwed something up... I cranked over our BD240 last night for the first time since rebuilding it. Didn't start it, removed the plugs and just cranked it with the starter to see if I am getting oil to the top end. After cranking it over a bit, I noticed a lot of oil pouring out of the bellhousing. I had a machine shop machine the block to accept a one piece rear main seal using instruction provided on this forum. The seal I put in was tight as Hell fitting into the block, so I can't imagine oil getting around it, but it is.... Also, I gooped up the flywheel bolts with sealant.
Here's something I am wondering though: The reason I wanted to make sure I was getting oil to the valvetrain is because while talking to some of you guys, as well as a mention in the manual, it seems that certain rocker arm rail supports are ported to allow oil flow. I did not see any ported while reassembling the head. There are three part number supports installed if I remember correctly, and I matched them to the parts book to make sure. There are the supports at each end, two supports that have a bushing in them, and two supports that do not have a bushing in them, so its somewhat idiot proof. But again, I saw no porting for oil. I am wondering if I missed something, because I cranked it a good bit but never did get oil to the head. Even though it was pouring out the back, I would still think that some oil would have made it to the top. I could be wrong though... Do you guys think its possible that I have an oil passage block at the valvetrain, and if so pressurized the crackcase enough to push the oil past the rear main seal?
Probably just wishful thinking at this point....
Any insight would be appreciated. I am literally sick about this...