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In doing a search I was surprised at the lack of recommendations or experiences with some of the exterior oil sealants available. I understand Honda-Bond, and Permatex Ultra Black or Ultra Copper Maximum RTV silicon are excellent. I guess the challenge is finding exactly where the leaks is so as not to smear it all over the place. The bolts on the bottom of my ZF are always wet, and then small drops on the floor. Side gaskets have been replaced. Where are some other common areas?
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When I had my ZF rebuilt I noticed I had a few bolts on the bottom of the transaxle that were weeping after about two weeks of absolutely no leaks. I was given the option by the rebuilder of sending the transaxle back for warranty or trying to fix the issue myself. Since my transaxle was already in the car I thought I would try the fix.

I was instructed to remove each bolt individually and clean them with brake cleaner, including the hole, and then apply RTV and retorque the bolt.

It has been a couple of years now and all is well.

Devin
I just bought a Porsche 968 convertible witch had a serius leak on the gasket of the carterpan. I did not notice at first because of the underside of the car is covert.So I used a produkt called Petec leck up, it is german and cost 40 euro.This thing is amazing, not 1 drop anymore and believe me it was really bad. It is usable for engine transmission differential and others
RRS-1, the bottom cover gasket is paper and the bolts are often over-torqued so the gasket gets crushed into pieces. Which then leak. Other possibilities are loose bottom cover bolts or end-cap studs; the problem with these is trying to get the area clean enough for sealants to adhere, unless you drain the lube and carefully solvent-wipe everything. Just slobbering sealant on a place where 90-wt is leaking will usually do nothing.

Some owners have had good luck with sealing-washers both of soft copper and special steel washers that have bonded neoprene rubber in their IDs. Pegasus-Racing in WI sells the bonded washers and motorcycle shops stock dead-soft copper washers. McMasters-Carr in CA may also have both.

Finally, ZF specifies regular 80W90 but some people use synthetic lubes for supposed shifting improvement, which sometimes leak where non-synthetics do not. There are several different kinds of synthetics- some swell seals & gaskets, some shrink them and a couple do neither. The shrinkers will leak; unfortunately, manufacturers will not tell you which kind of synthetic they make.

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