Rear Mainshaft Seal Leaking

[porsche man]

I Had Replace The Flywheel Seal Four Times And It Still Leaking From The Seal I Had Try Different Brands Of Seals And Install Different Position And Brought A Factory Seal Installer Tool Lube The Inner Seal When Installing . The Leak Is Coming Between The Crankshaft And Seal And Will Start Leaking About 3 Mim After The Engine Is Started The Crankshaft Is Not Sore Can Any Body Help Me

[88911coupe]

Is there any damage on the surface of the crankshaft surface at all?

[equality72521]

Are you installing it with the spring towards the fluid?

[vmisquez]

You may want to try an OEM seal from Porsche. I've heard there are problems with other seals. I ordered the OEM seal just to be safe.

[mackskibum]

Have you checked the drain hole behind the seal- maybe blocked? Also, the seal should be slightly "proud" of the housing- that is the seal should be slightly higher than the housing and completely square to the bore.

[3.2 CAB]

The "The Crankshaft Is Not Sore" ??????? Are you meaning that the crankshaft is not SCORED, as in: grooves, gouges, dings etc???
Hopefully JW, is watching over us out there somewhere! John, do they even have that crankshaft seal area collar kit available for Porsche? Tony.

[tab tanner]

You have a groove worn it the crank shaft I'll bet?? You can use a product called a (speedy sleave) to repair this, it is a very thin stainless steel sleave that sides over the end on the crankshaft and is locktited in place. I have used them in the passed with GREAT succes. Check NAPA of Google speedy sleave

[john walker's workshop]

i had a 2.7 long ago that had a case so worn out that you could move the flywheel sideways and all around about 10mm. take a couple of screwdrivers, one on each side of the flywheel and see what you have.

[dweymer]

Originally Posted by tab tanner

You have a groove worn it the crank shaft I'll bet?? You can use a product called a (speedy sleave) to repair this, it is a very thin stainless steel sleave that sides over the end on the crankshaft and is locktited in place. I have used them in the passed with GREAT succes. Check NAPA of Google speedy sleave

Got a part number or size specs. I have hed the same problem, and just installed the 5th seal. Bore is round, crank is round, and no axial play like JW mentioned. Good luck Porscheman!

D

[3.2 CAB]

Tab, I was not sure if there was a "speedy sleeve" available for the 911 engines. That is what it sounds like it may need. I have used them in the past on the domestic iron, but never had to use on a 911 yet. Tony.

[1982911SCTarga]

More info here.

Brian

[dweymer]

It appears Stoddard does not carry the one for the flywheel end for a 2.7 crank.

Here is the entire SKF speedi-sleeve pdf application file. It looks like pn 99254, or 99841(gold version) would be appropriate for the flywheel end of the 6 bolt 70.4mm crank.

http://www.acorn-ind.co.uk/pdf/prspeedi.pdf

[1982911SCTarga]

Donnie, did you search? I saw one there that they say fits 911 crank flywheel ends from 1965-77.

Brian

[cgarr]

If everything is good, crank, seal, installed square,etc it could the the case where the seal is pressed in, may not be as round as you think, this could deform the seal after its installed. Or were the return oil holes behind the seal open? The rear bearing can close off about half the 2 holes check for crud or sealer in there. If the oil cant get out of there its going to go somewhere.

[dweymer]

Found it:
stoddards PN:SIC-102-992-54 , it is not in their site under mid year, search the early section/engines/speedy sleeve to find it; $38.25.

[930gt-40r]

check the crank radial play... if there is too much play they tend to leak.
There is another trick though- Im not sure of the material used but I have seen in the past people fill the grooved side of the seal with a certain oil resistant sealer- when it cures, it puts extra pressure against the inside part of the seal so it seals tighter to the crank shaft.

[nreed]

You were commenting on a flywheel seal thread about the seal being "proud". Below is a picture of how I installed my seal. I have a leak and am wondering if I installed it wrong.

I am also wondering if it is a problem with a grooved or out of round surface. Do you think I will be able to find a Speedi Seal for my crank?

Thanks!

[HawgRyder]

C/R (Chicago rawhide) carry seals that have more than one sealing ring.
That is to say they have several points of contact with the crankshaft, so at least one of them will be in a new place on the surface .
Bob

[jjrowe]

This issue has been discussed quite often on this board. There are two ways the seal will leak:

1. On the inside of the seal where it mates with the crankshaft, this is due to wear on the shaft itself and can be fixed by using one of the sleeves mentioned above

2. On the outside of the seal where it mates the case.

As far as whether to install the seal before (like Wayne suggests) the case halves are mated or after (as others have suggested), I think the jury is still out. I found it hard to keep the seal straight when the case halves were mated so I did it after the case was done.

I still had a leak and it turned out to be between the case and seal (which I think is common with these old mag cases). I cleaned the area well and then put a thin coat of black silicon on the outside of the new seal before I installed it. This stopped the leak. Since the silicon was on the seal any excess was pushed out when the seal was pressed in, be careful not to get any on the side facing the motor.

- Jesse

[Eagledriver]

The seal in the picture is installed too deep IMO. It should be flush with the case surface or slightly in/out to keep the seal out of any groove worn in the crankshaft.

-Andy