Nice! I could live with that! I appreciate it!
Don

 

Coming back around, the other issue with that part of the case is that the tubular casting directly above the bolt is an oil pump galley that crosses the case. Unlike a typical case seam that area is under pressure and has a compression o ring between the case halves. Not getting adequate clamping there is a problem. Again I would check to see if the oil is coming thru the bolt bore and out from under the bolt head/nut thru the threads, if so you have some different options.

 

HI JRichard thanks for your reply.

Now you have me in suspense.

There is a strong chance that is how it is happening. When I removed the bolt, the threads were filled with oil.

I replaced it with a hardened bolt, torqued it down pretty hard but it didn't do too much to slow down the leak.

Do you have a solution in mind?

Any help would be great!
Signed desparate Don

 

Don,

yeah I would be trying everything I could to not tear it down again. But it will be experimenting and none of it is a factory solution.

Im assuming the case o rings are in place. But if you are getting pressure leakage the odds are it’s coming from that location and down to the bolt bore and out through the ends of the bolt. If the leak increases when it’s running that’s a pretty good indicator.

If it’s a pressure leak the vacuum injection solution, (which I’ve never heard of but is damn clever) won’t work for you. You could try the opposite and rig up a pressure line and inject sealant in the bolt bore and put it under pressure. You could use an undersized bolt with rubber stoppers/washers fill the bore with sealant and tighten until sealant leaks out under pressure from compressing the stoppers. The only issue is the potential to force sealant into the oil galley and you still have to clean out the bolt bore as you really don’t want to glue a bolt in the hole with 574, that would be ugly.

The simplest idea would be to get a proper bolt, right length, only threaded at the end so you have a solid shaft through the mating surface of the case. Clean out the bolt bore with choke or electrical spray and let it dry, goop up the bore and the bolt shaft and under the head/washers with sealant and torque it to spec. Don’t try to over tighten it, it could actually make things worse. For the sealant don’t use anything like 574, get a tube of Dreibond 1209, don’t get it on your skin.

anyway hope that helps, may be a bit of trial and error, but I’d be trying everything before splitting a motor again.

Jim

 

It appears Drei Bond is a silicon based product. Will it work in this application? Seem like some of the Threebond, Yamabond ,Hondabond etc products might work better. Although IIRC 574 will dissolve itself when applied over old 574. If it is leaking through the bolt then it is possible he can find a solution.

GL

 

Yep that’s what I would use. IMHO I don’t think you can recreate the 574 seam seal at this point so creating a seal around the bolt is the best course of action. The dreibond is tenacious, stays flexible, cures in oil exposure and important in this situation you can get the bolt out if you need to.

 

I learned to use wax some time back around stuff that was hard to get something to then bond to. The wax creates a barrier after cleaning to then apply whatever you want. I'd do anything at this point, just to not have to take it all apart again.

 

Hi Jim,

I just received the Dreibond.

I understand your directions.

My only question at this time would be that after I 'goop up' bolt hole, tighten the bolt down, and should it still leak and I need to tear the engine back down, will I be able to successfully remove the bolt and clean off all of the Dreibond?

Thanks,
Don

 

Don, the DB1209 is a silicon paste, it dries flexible and is removable. That’s why I’d use it rather than anything like a Permatex or Locktite. The bolt should twist out of the bore if you do have to disassemble it. All I’d be doing is trying to get a seal around the bolt shaft across the case seam. I’d use as much or as little as you’re comfortable with but I wouldn’t be that worried about getting the bolt stuck. If it’s this or a tear down I’d be pretty liberal in the application…

 

Jim,

I applied the Dreibond 1209 by liberally spreading it all over the bolt inserted it into the hole torqued it down and.........it stopped the leak!!!!!!!!!

OMG! you saved me a couple of hundred hours of tearing down the engine again.

Thank you so much for your assistance.

I can now at least drive my car to the Porsche meets without embarrassing oil puddles wherever I park.

Thank you again Jim!

Don

 

Don,

Fantastic, glad it worked. Obviously keep an eye on it but I think you got it figured out.

Some guys like to tear a motor down for the smallest issue, I’m not one of them….

👍

Jim