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Old 08-07-2018, 09:02 AM   #1
keekster64
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Default Leaky flywheel oil seal? Step this way.

Over the years I've suffered from leaky flywheel oil seals. The cheap seals are rubbish, they can't take the heat of an aircooled engine. The silicon ones can but are too soft and if they dry out say due to the car sitting over the winter can suffer on startup. The solution is a high quality viton rubber seal. You need a generic seal with the size 70mm ID 90 OD and 10mm thick. A single lip seal will cost you approx £11. Worth every penny. I got one from these guys
https://simplybearings.co.uk/shop/Se...462/index.html
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Old 08-07-2018, 01:02 PM   #2
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Interesting...I'm just about to change mine.

A quick bit of googling would suggest the (theoretical) disadvantage is viton isn't recommended for applications below -20 deg....not a problem methinks!

How long have you been running one of these seals?
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Old 08-07-2018, 01:55 PM   #3
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I love Simply Bearings. Used them for steering box rebuild and plenty of other VW related tasks

And for an extra 6 quid you can get an SKF one
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Old 08-07-2018, 02:28 PM   #4
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Are these tried and tested on a vw engine? Tx

I was given a sand seal which have lost somewhere which looks similar from memory.
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Old 08-07-2018, 04:15 PM   #5
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Yup, tested on my 1776 with a Waterboxee crank that required a thinner seal. Modern cars use them. I have a theory that the genuine seal is viton, price wise it's about right.
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Old 08-07-2018, 04:23 PM   #6
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Quote:
Originally Posted by psimitar View Post
I love Simply Bearings. Used them for steering box rebuild
same here when i resealed my steering box,have had loads of mtb bearings from them too,its always decent quality stuff.
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Old 09-07-2018, 04:24 PM   #7
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I’m about to do my seal tomorrow I got one from schofileds as heard they do the good ones �� , mine doesn’t leak oil until the engine gets really hot then squirts out like a tap, is there anything else to look at once my engine is out?
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Old 09-07-2018, 04:33 PM   #8
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Yes. Measure the end float. Also, check the back of the flywheel where the seal sits, it should be perfectly smooth and not rough or marked. Change the O ring whilst you are at it. Also, if it’s not a viton seal, I wouldn’t bother fitting it IMHO. Phone them up and ask them to confirm if its a viton seal. Looking at the price they charge on the web site I'd say its a cheap seal. Waste of time.
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Old 09-07-2018, 05:03 PM   #9
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This is the seal not sure what make it is
Is that a common thing to happen that oil only spurts out when itís hot
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Old 09-07-2018, 05:15 PM   #10
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Impossible to tell what type of rubber it has. I'd ask them. If they cant tell you I would buy a viton seal instead. As for your problem, hard to say. When engine hot, oil is thinner, and could well be leaking past seal. However, too much end float or rough face on flywheel will also cause problems. I posted my original post above because I was fed up with being sold cheap crappy seals. It doesn't matter if its german, a cheap seal is made of inferior rubber and in an aircooled engine you need decent high temperature rubber. Id wager that your seal is not viton rubber. In which case you will end up replacing again.

Just checked, NBR stands for Nitrile Butadiene Rubber
So not Viton. You pays your money you takes your chances.
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