Gearbox shifter seal

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Jona1971
E30 Zone Regular
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Joined: Sat Mar 15, 2014 11:00 pm
Location: Staffordshire Moorlands

Post Sun Sep 10, 2017 8:34 am

The engine and gearbox are off the car, I'm replacing the clutch.

Which seal is it I should replace while its convenient now?

WIKI: "Change the gearbox shifter seal. This little bugger is the cause of 99% of gearbox leaks. It takes 5 minutes and 2 pounds to do if the gearbox is off the car. It takes 5 hours if the gearbox has been fitted."

The shaft seal in the bell housing or the one at the guibo end? I'm not clear.

Thanks :)
Moredoor autos with small engines are cool - but my new m20b25 is awesome!
Yeti
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Post Sun Sep 10, 2017 4:15 pm

i would do all but the question your asking means the same end as the selector shift but it wont hurt doing the input shaft(engine side) as well
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Brianmoooore
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Post Sun Sep 10, 2017 10:27 pm

I've never changed a crankshaft rear seal, a gearbox input or output shaft seal on an E30 in my life. They don't fail.
I've changed loads of selector shaft seals. This is the tiny seal behind the knuckle joint that connects to the gear lever linkage, and is notorious for leaking. The oil normally runs straight downwards onto the top of the gearbox output shaft, where it runs around each side, and drips off of the bottom, making it look like it's the output shaft seal that's leaking.
Knuckle joint is removed by spreading and sliding the spring collar out of the way, and pushing out a little steel pin. Seal can be prised out with a small screwdriver, but it doesn't matter if a new seal is drifted into place, pushing the existing one further into the housing. There's room for at least three.
Jona1971
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Posts: 474
Joined: Sat Mar 15, 2014 11:00 pm
Location: Staffordshire Moorlands

Post Mon Sep 11, 2017 4:14 pm

Thanks both,

I've found the gear selector shaft seal now and ordered a new one :)

Why is my bell housing interior caked in black oil? I thought it was the input shaft seal??????
Moredoor autos with small engines are cool - but my new m20b25 is awesome!
Jona1971
E30 Zone Regular
E30 Zone Regular
Posts: 474
Joined: Sat Mar 15, 2014 11:00 pm
Location: Staffordshire Moorlands

Post Mon Sep 11, 2017 4:18 pm

As in 23121209311
Moredoor autos with small engines are cool - but my new m20b25 is awesome!