How can I stop a Gearbox oil leak ?

farrikt · Postby **farrikt** » 10 Apr 2012 18:35

Anyone had a good experience using oil leak additives that allegedly stop or reduce oil leaks ? I have an annoying oil leak that seems to be coming from the gearbox, nothing major so just want to slow it down until I can take care of it. Thanks for any suggestions.

Kevin

Beans · Postby **Beans** » 10 Apr 2012 20:27

Were's the leak?
Always better to do it properly, so change the seal.

<center>

1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

nick · Postby **nick** » 11 Apr 2012 16:49

Never heard of an gearbox additive. Some have reported success with an engine additive, although I am not a fan of using these products. Best to fix the leak properly.

Where exactly is the oil leaking? Are you sure it is the gearbox? Best to do a thorough cleaning and then run it to see where the oil is coming out. Report back and I'm sure we can help out.

nick
'79 TR7

FI Spyder · Postby **FI Spyder** » 11 Apr 2012 18:39

A common leaking point is the old O ring seals on the oil pump and the oil transfer cover where it is then blown back to the gearbox at speed. Best attend oil leaks when you have to change the clutch which is where I'm at now. There is a front oil seal, rear oil seal (can be changed without taking out trans). Another spot is the rear engine seal and the shifter rod O ring and the speedometer O ring and oil seal. The rubber gets hard with age and heat and shrinks a little as well. It looks as if my transmission has been opened before as it doesn't have gaskets but gasket goo which I'm presuming they used rather than waiting for a gasket order to come in.

Not a fan of stop leak additives (trans or rad). I'd rather put up with it. Read this.

http://www.epinions.com/auto-review-51D1-9E04C92-397E2532-prod4?sb=1

- - - - TR7 Spider - - - - - - - - 1978 Spitfire - - - - - - 1976 Spitfire - - 1988 Tercel 4X4 - Kali on Integra - 1991 Integra - - Yellow TCT

Beans · Postby **Beans** » 11 Apr 2012 19:24

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by FI Spyder

... the shifter rod O ring ...<hr height="1" noshade id="quote"></blockquote id="quote">
Not the most simple solution, but this is how I have tackled this problem on the gearbox I am currently rebuilding ...

1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

nick · Postby **nick** » 12 Apr 2012 18:28

Beans,
When I had my gearbox out I had good luck with replacing the shifter "O" ring. No leak after about 1,000 miles.

nick
'79 TR7

Beans · Postby **Beans** » 12 Apr 2012 22:38

The original oil o-ring will also be used, this is just an extra seal.
Bonus is that it not only seals against oil leaking out but also against dirt getting trapped between selector shaft and casing.

And to be honest 1000 miles isn't that much for a seal to last.
I covered 10.000 km with my DHC in 15 months before the (paint) troubles started.
So I want a better life expectancy from my oil seals [:D]

<center>

1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

DNK · Postby **DNK** » 12 Apr 2012 22:44

Beans, you did document how and with what tools you used ,didn't you? [?]

Don
"No More Cars For You"
71 TR6- Perpetual remodel
80 TR7 V8 Kick in the pants

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How can I stop a Gearbox oil leak ?

How can I stop a Gearbox oil leak ?

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