I have purchased used 1987 930 motor from
Richard's European Car Service Inc
(912) 265-1974
Address: 1516 Bay St, Brunswick, GA 31520

the motor was rebuild 16,000 miles ago from what the owner Richard told me.
The motor was instoled and when test driven it has a a large leak out of the front main crank seal and the shop wants to do ti the right way tare down the motor to change the two seals , they told me that there is another o- ring on the main bearing that is probably leaking as well ( cracked or pinched when engine was rebuild) and is causing the main seal to leak .
My question is :
by replacing just the outer seal which in fact is the main seal on the crank should stop the leak right, with out tearing it down or it will not ?

Best Regards
Robert

 

Robert..

They are correct, there is another o-ring there, just after the main bearing that could be pinched. The engine was rebuilt and has been sitting, that seal sometimes will shrink and does not expand enough stop the leak once running.

That being said, I would still just replace the crank seal as it will probably stop the leak. Besides being a hell of lot cheaper than disassembling fresh engine to replace an o-ring. Go this route and see waht you get. I may even suggest going to a different shop.

Good luck

 

Thank you Onboost

The engine has to come down to replace that seal right ?

 

You can do this by lowering & supporting the engine. It does not have to come out. Be sure to unhook the wiring harness from the board on the left of the compatment, you don't want to stretch them.

Drain the oil first. Then you should remove the bumper as it makes the rest a lttle easier. Remove exhaust, rear engine tin, turbo piping that runs through tin, cross bar, muffer mount and engine mount. You should then be at the crank pulley remove that and you're there. I would also replace and seal the intermidiate shaft gasket while you're there (the plate just under the crank seal). Use Locktite 574 on the gasket, and I like to coat the seal with a little Curil silicone paste before I install it. Or of course if the shop is doing it then they know all this already.

Regards,

 

Thank You onboost
I have spoken with the shop and they told me that they have replaced jest the outer seal previously and the oil was still leaking out they told me that the space between the o-ring and the seal fills with oil and some pressure from the case when the motor is on boost and the outer seal is not design to hold that pressure and leaks almost instantly even if replaced ????
My opinion on this is that there is oil there any way maybe with less pressure if the o-ring is good, but in my opinion the outer seal has to hold some pressure it`s design to do that plus the case is very well vented and it should hold it . One more thing the original owner put epoxy around that seal so it most likely was leaking where the two metals meet . I have never had any experience with this motor or design and the shop is in business for 24 years it`s almost stupid to question them but money is money, they will do whatever i will tell them but he told me that i`m wasting my money with trying to replace that seal along

Regards,
Robert

 

It's a toss-up then.

I say it could still be just the seal and you don't know without replacing it.

I can't see the PO doing the disassembly as stated above, and smearing epoxy over the leaking seal, nor can I see replacing the seal and then smearing the epoxy on.

You either replace the seal.. you find that it does not leak or.. in the event that it does still leak.. you know that you've got to go in for the full disassembly.