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Old 03-30-2008, 12:05 AM   #1
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Default Stripped Threads in Differential - Need Advice

PO overtorqued differential fill hole so tight that the washer wedged upwards 360 degrees around the bolt.

Anyway, when I tighten the bolt, it just keeps spinning. Fluid is slowly leaking too.

Helicoil? Or is there something else better? I've never done this before.

Thanks.
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Old 03-30-2008, 12:31 AM   #2
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Is the fill hole on the dif cover or on the main pumpkin? If cover, then call PlanetMiata and get a new one. If body, and you can get the bolt out, then just use a cork from now on.
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Old 03-30-2008, 12:35 AM   #3
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Take the plug out, go to autozone, see if they have a "oversized" plug. If they look at you stupid, go and look on there "HELP" rack.
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Old 03-30-2008, 12:36 AM   #4
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It's the top bolt hole. The bolt is out, but the hole is stripped.

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Old 03-30-2008, 12:39 AM   #5
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worst case, you sorce a new housing. 1.6 diff should not be more then 40 bucks.
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Old 03-30-2008, 12:39 AM   #6
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To address your "better than a helicoil" question, there is nothing better than a helicoil. That's a whole 'nother thread though. Don't be afraid to use one.
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Old 03-30-2008, 12:42 AM   #7
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What's a 'cork'? Does it still thread into the hole?

Last edited by kenzo42; 03-30-2008 at 05:23 AM.
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Old 03-30-2008, 12:43 AM   #8
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Hmm, If it were my car, I'd measure the diameter of the hole, and drill and tap it the next size up. You could also try runing the correct tap through it to "chase" the threads and see if that's enough to get it to bite again. I've never heard of an oversize plug, but if they make them try that first for sure. Oh yea, no VLSD in there.
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Old 03-30-2008, 01:11 AM   #9
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just put some jb-weld on it. there is no pressure or anything crazy going on there
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Old 03-30-2008, 10:59 AM   #10
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Quote:
Originally Posted by bryantaylor View Post
just put some jb-weld on it. there is no pressure or anything crazy going on there
Very true. And you only have to monkey with it every 50,000 miles or so.
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Old 03-30-2008, 07:00 PM   #11
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Ended up putting 2 washers on it. Seemed to grab the remaining threads well. Hasn't leaked since last night. Only time will tell.
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