Back in beige

[Bruce M]

As mentioned, did you remember the single use soft metal gasket? (The bolts pass through it). Worth checking the end float (with the gasket installed) is in spec. The oil drain should be clear (slightly left of centre behind the seal). If you have a slight grove or roughness on the flywheel (can be a very narrow band), using a 8mm width seal might use a fresh surface on the flywheel. That area is not subject to full oil pressure so the leak is not due to high oil pressure. Although high crank case air pressure (original breather fitted?) could cause be a cause, especially with fresh rings and lots of blow by (until they seat).

[squirejo]

As a muppet I can't offer any technical advice, but, I would like to say THREAD OF THE YEAR for me Jamie. The trials, tribulations, and, triumphs have made for compelling viewing! I hope this is all sorted out readily and you'll be behind the wheel with a huge smile soon. All the best then, for a happy 2016!

[Lightweight_911]

All the best then, for a happy 3016!

Hopefully Jamie will have it all sorted & on the road before then ! ...

[jamie]

Hi Andy. Yes, thin gasket is installed. I may try the 8mm seal (ready available as used on the Daewoo Matrix, I've found).

I am also going to chuck a boroscope in each cylinder and just check for scoring / other evidence of cracked piston rings. I presume they're not, but you never know...

And thread of the year? I can't agree, but I appreciate the kind words!

[nickT]

Hi Jamie, have you lost case breathing at the top of the engine by fitting the aftermarket oil filler cap ?
Is the engine only breathing through the RH rocker cover ?
Cheers, Nick.

[Bruce M]

I tend to order odd seals from simply bearings. They do SKF in viton with a single lip in both 8 & 10mm...

[jamie]

Hi Jamie, have you lost case breathing at the top of the engine by fitting the aftermarket oil filler cap ?
Is the engine only breathing through the RH rocker cover ?
Cheers, Nick.

Hi Nick,

I have breathing on both rocker covers, plus another just behind the oil filler cap. No evidence of oil escaping from any of them (because it's all coming out of the main seal, LOLLLZ!).

Thanks Bruce. Have used these guys in the past. I'm a fan.

[Gary71]

Is there any way you can measure the diameter of the crank in the sealing area? Is is scored, worn (or been machined) undersize?

You can use these to bring the shaft back to size and a good surface, also stocked by Simply Bearings:



http://www.skf.com/binary/81-61918/TT08_021.pdf

[Gary71]

Just looked again at the pictures, does the seal seal on the flywheel rather than the crank? If for any reason the flywheel is not perfectly concentric to the crank then it also will struggle to seal.

If it is this way around I guess you could use a sleeve as above on the flywheel instead of the crank.

[jamie]

Hi Gary,

Thanks for this. It seals on the bit where the flywheel tapers to meet the crank.

It appears true and unscored. I haven't checked the diameter - am ignoring the car for the moment.

Jamie

[964RS]

I can't offer you any help at all. But patience young jedi, you will get there, these things are sent to test you, the force is strong in you

[neilbardsley]

Jamie do I search of the 356 registry I think I've seen this issue a few times

Here is the thread I was thinking of

http://forum.porsche356registry.org/vie ... ak#p254012

[KS]

If it's any consolation, I discovered a pool of oil under the back of my car when I went to get it out of the garage just before Christmas. I can only guess flywheel oil seal, too. Put the car back in the dry, shut the garage door and walked away from it until I feel better able to cope with more hassle...

[911hillclimber]

Could be box oil?

I suffered box oil leaks and had to remove the box 3 times to fix it (late 915 box) and I fixed it by knocking a new input seal into the housing so the lip would run on a 'virgin' part of the shaft.
All that effort just to knock the seal a bit further in.

It does not leak now 2 years on.

Always could be the pesky rocker cover(s)...

[jamie]

It definitely doesn't smell like gear oil. Also, Mike Bainbridge was the last person to touch the gearbox - it won't be leaking!