348/355 Main seal orientation

I'm waiting for this answer.

 

Oh yeah chubby, well who came up with especiale tool #23 to hold in the bearings.

 

Even a blind squirrel finds a nut once in a while.

 

well...I must admit you are good with all things rubber.

 

I have not installed any yet because the feedback I have gotten is that no one likes the new seal and I have still been able to get the old style. If I could see the other side of the seal I suspect I could give you an answer. I also suspect there is a TSB that explains it. At first glance I would say the side you are not showing goes to trans side but I would like to see the other side.





ALL modern motors whether they are dry or wet sump have a vacuum in the crank case. It is done for a variety of reasons.

1. Emissions. They suck out vapors and burn them in the motor to prevent them going to atmosphere.

2. Horsepower. It makes more that way. Even race motors are provided with some method to draw a vacuum. The crank spins and the pistons go up and down easier in a vacuum.

3. Dry sump scavange pumps are usually twice the capacity of pressure pumps to ensure all the oil is sucked out and a side effect of that is to cause a vacuum.

Even old road draught tubes were designed to draw a vacuum at speed when the motor was working hard.

The vacuum producing capacity of the 355 oiling system is why we see little oil burning in those motors when the rings go bad. It does a pretty good job of preventing the oil from migrating north past the rings. I also slows to a crawl the oil going past the guides when they go bad. In old road draught motors with rings and guides that loose we would not have been able to keep oil in the motor.


Some BMW motors will start running bad and display vacuum leak symptoms when they have bad crank seals or valve cover gaskets. There are no oil leaks to indicate the seal failure. So much manifold vacuum is piped to the crankcase it prevents the oil going out through the leaks and causes bad running.

 

Wow! I wouldn't have expected *that* answer for crank seals.

Learn something new everyday around here...

 

Any "official" responce yet on the direction of the seal?

 

No responce yet (no surprise). I'll check into that tomorrow.
Here is a picture of the "front" and "back" of the seal. May not be detailed enough for you.
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The top picture goes towards the trans.


That lip standing proud of the recessed seal is for the purpose of spacing the lips correctly on the seal surface of the crank.
It prevents you from pushing the seal too deep in the housing.

 

Just like I put it in my car.

And now we have Brian's blessing putting it in that way too. I told you fatboy, the double seals go in facing the engine.

 

The same way I told Daniel to put it in

 

You know him. He is just one of those guys that asks and asks and asks until he gets the answer he wants.

 

Could someone please post pics of the 2 piece seal?

Thanks

 

Here ya go...
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"Official" answer from Ferrari:

"We cannot find a bulletin on this."

No S#*t.

 

Hahahahaha.

Why doesn't that surprise me?

 

Never ever forget...


They build cars.....They do not fix them.










OOOOPS

I forgot all about their new found skills at restoration. HAHAHAHAHAHAHAHAHAHAHAHAAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHHAAHAHAHAHAHAHHAHAHAHHAAHAHAHAH.



WHAT A CROCK OF *****

Well any idiot that actually pays them for it gets what they deserve.


Cher had it right


Gypsies tramps and thieves.

Too bad the guys that design and build the cars have to associate with the rest of that scurvy crew.

 

If it wasn't for low quality, there would be none.

 

Ferrarioldman....thanks for posting pics of old seal......

 

Here is a picture of the new seal installed if anyone is interested.
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Thanks for posting it Tom.

 

And thank you for your advice, Ernie.

 

Glad I could help.

 

Gents just an easy way I found to get the seals laying the right way on install was the use a ring compressor in reverse. Just had the ring compressor over the crank and slid seal and housing off it onto the crank Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login