I have an oil leak from the case bolt that runs in the middle of, and a little below, the push rod tubes. This is the bolt that runs through the oil tube. The case is stripped.

Does anyone have a good recommendation for repairing this? It's pretty deep (8 x 88mm bolt).

Do I have to split the case? I would prefer not to because the flywheel and fan hub are still attached.

If I do have to split the case, will I need to replace the engine bearings? Or can these be reused? They were recently installed - just a few hundred miles on the rebuild.

Thanks

D

your situation leads me to suspect that the sump bolt has been tightened too much and has pulled the bolt that you describe as loose, and has broken the case on the inside. this is just a guess but is a bad fault. the oil sump bolt has a torque value of about 9 ft lbs and if tightened too much, can pull the bolt which can break the case where the bolt threads into. if that is fact, then the engine is history (the case is history, i don't know how much of your rebuild could be transferred to a new engine case.)

I agree.
It can be fixed.

Rich

Rich,

Can or cannot be fixed?

Since it's only 9 foot pounds, would permatex thread repair hold this?

thanks

D

i don't think permatex will repair it. you might try it and see how long you can go but to fix this, IF what i described is correct, the broken piece inside the case can be welded but you have to go all the way down to the case half to get to it.

As I stated, it CAN be fixed.
You need to take the case apart, period.
Do not bother with any other way.

The fix is simple.
Either swap case halves for a good one, or weld up the bung.
Jake offers this service and I think he adds some extra metal to make sure it wont happen again.

While this is a common break, its not so common that you see it every day.
It really is a hour or so of welding...then put it all back together again..

Rich

Thanks Guys

I make this repair often. 80.00 and it won't break again.

aren't the case halves a matched set?

I think I popped mine one day when expereincing a Wheatie's over dose. Dosn't seem like my case bolt looened up though? Maybe I got lucky!