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Stripped clutch slave bell housing threads.

Old 09-13-2015, 05:59 PM
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Default Stripped clutch slave bell housing threads.

[amateur mechanic alert on]
I stripped my clutch slave threads in the aluminum bell housing.

What are the options to fix it:
1. Helicoil - drill, tap and insert the helicoil.
+ permanent solution
+ reversible
2. Loctite thread repair kit
- is it strong enough
3. Epoxy
+ permanent
- irreversible

What fastener to use:
1. New Bolts -
- still uses soft aluminum every time the clutch slave comes off.
2. Stud/nut - using red Loctite or epoxy to permanently set the stud.
+ doesn't disturb the aluminum
+ if 1 nut comes off, the clutch slave stays in place.

I'm torn between:
1. Helicoil and stud w/ red loctite,
- this requires removing the transmission, on jack stands, to drill and tap.
2. Epoxy and studs.
+ this doesn't require removing the transmission
- will it be strong enough for a track only car. (ACT HD clutch)
[amateur mechanic alert off]

The real question:
Will epoxy and stud work?

Transmission removal and re-install is a big job alone on jack stands for an old guy.
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Old 09-13-2015, 06:05 PM
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I'd be deciding between helicoil or drilling out ever so slightly and using 1 step bigger bolts
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Old 09-13-2015, 06:10 PM
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Fill hole with JB Weld. Allow to cure. Re-drill and tap, being careful to not drill too deep and to keep threads square to boss surface. Permanent fix, cheap and fairly easy.
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Old 09-13-2015, 06:50 PM
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Originally Posted by 18psi View Post
I'd be deciding between helicoil or drilling out ever so slightly and using 1 step bigger bolts
I thought about tapping to the next largest size, but ...
The stock bolts are M8x1.25x20mm. The next largest size M10 won't fit through the clutch slave holes.
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Old 09-13-2015, 06:53 PM
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yep, and there's plenty of meat on the mounting tabs to enlarge those.
just a suggestion
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Old 09-13-2015, 08:43 PM
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I've dealt with a transmission where some junkyard "mechanic" stripped one of the holes. The holes are tapped deeper than what is needed. You may be able to drill out damaged threads, then thread a longer bolt (like a 25 or 30mm) into the hole and catch enough good thread to make it work.
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 09-13-2015, 10:44 PM
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I got studs and found the holes are already longer than the stock bolts used. So there are still good threads a little deeper. I gently screwed the studs in. I used the epoxy, but I probably could have gotten by with Red Loctite.
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