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914World.com _ 914World Garage _ Pushrod tube seals

Posted by: Jeff Bowlsby Dec 15 2003, 09:53 PM

Ok so I know that I need to use the Viton seals and meticulously clean the bores of any debris/contaminants/oil. Beyond that my recollection is that there are different approaches:

1. No Lube. Lay em up dry. Is this recommended and does this work?

2. Lube 'em. What works? 30 wt? Silicone grease?

3. Some kind of adhesive...hi-temp silicone?...but dont they need to move with engine expansion?

Tell me what to do...so I dont have to do it twice...

And Thankyahs!

Posted by: john rogers Dec 15 2003, 09:55 PM

I use a good coating of hi temp Amsoil synthetic grease. I also use it on the o-rings of our 1987 930 and it never melts or leaks.

Posted by: URY914 Dec 15 2003, 10:00 PM

The best way to insure no leaks?

Don't put oil in it.

Paul

Posted by: Jake Raby Dec 15 2003, 10:27 PM

Teflon thread sealant... Loctite 574 and Viton seals.

I have built hundreds of these engines and this is the only way to seal them completely that I have found.... also ensure that all Burrs and sharp edges are non existant in the case and head bores, else it will cut the o rings and leak like mad.

The art of building a leak proof engine was harder than any other TIV aspect I have ever attempted.... I've had it down since about 1991, but still have a leaker that needs some touch up on the dyno every now and then.

Posted by: 2-OH! Dec 16 2003, 08:11 AM

Jake,

Sorry to seem dumb but...

Can you give a quick detail on the Loctite and the Thread sealant...Where and how do you use which...

I have the Viton seals..

2-OH!