flywheel seal leakage

[Mr. Oldskool]

Ok, what am I doing wrong here:

I put the first 200miles on the karmann and every time I stop somewhere there was a puddle of oil under the car.
I took the engine out this morning - because I'm leaving on holliday tomorrow and this couldn't wait 2 weeks, altho my girlfriend seems to think otherwise -

the leakage is coming from the flywheel seal, but here's the strange part: the seal is brand new and still looks brand new. the (lightened) flywheel is also brand new and shows no signs of wear what so ever...
what I did discover is when I put the seal over the flywheel (without puthing it in the engine) there is little or no resistance between the flywheel and the seal. is this normal?
it's the seal with single lip and the flywheel is a lightened one.

thank you

glauco

[Dale M.]

Possibly flywheel is machined to small in area where seal rides?... It only takes a few thousands of a inch (mm) to allow oil to escape by...

Dale
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[Cusser]

I just rebuilt my 1600cc engine 1.5 years ago, new oil seal. But it did leak at the flywheel seal, a spring had come loose, see picture.

I installed a new seal and O-ring, now no leak.
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[Mr.Oldskool]

[AlteWagen]

The secret to flywheel (and axle) seals is the spring. Find the ends of the springs and reset them a little tighter.
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[Mr.Oldskool]

[chrisflstf]

[Mr.Oldskool]

[gt1953]

I went and replaced three seals and then duh looked at the groove worn in the flywheel....replaced fly wheel leak gone!
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[VW_Jimbo]

Many times when cars drove into the shop leaking oil at the flywheel seal, after a customer self build, we would find that the drain hole was blocked full of sealant.

You may need to clear that drain hole, they get plugged very easily.
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[Mr.Oldskool]

[Dale M.]

[60ragtop]

You did install the oring on the flywheel?
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[chrisflstf]

Is the new flywheel a new aftermarket flywheel or is the new flywheel a new ( as if you just bought it ) german flywheel?

Seal needs to be installed straight and even. There can be no issues with the area the seal rides on the flywheel. Must be glass like smooth.

Lip of seal needs oiled after replacement, before motor is run or the lips will burn

Excess crank end play can causes leaks also

[74 Thing]

The seal actually goes a little deeper than flush with the case. Are you using a seal tool to install?

Also, are you sure it is not the tranny? I had a leak at the case/tranny mating surface after a clutch disc failure and I thought it was the flywheel seal. It turned out to be the transmission input shaft seal.

[Mr.Oldskool]

[satterley_sr]

I just had an issue with a new Chinese flywheel. Tried new seals, new o rings, sealant on face. Solution was an original German stock flywheel.
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The problem is most likely the flywheel BUT you may be able to fix it. I have found that using a brand new flywheel with a German case that doesn't have the oil return below the seal can cause a leak AFTER the engine is shut off. The problem is that the o-ring groove is cut too deep in the flywheel so it doesn't squeeze the o-ring tight enough around the crank.

IF this is the case, you can either replace the flywheel with a German one OR use permatex between the crank and flywheel.
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[hazetguy]

[Mr. Oldskool]

for those who were wondering, it turned out to be the primairy shaft seal that whas leaking...
replaced both the seals (primary shaft and flywheel seal) and so far no leakages any more...

glauco