Gearbox gasket

Technical questions and answers about the Mazda Bongo

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briwy
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Gearbox gasket

Post by briwy » Wed Dec 28, 2011 10:28 am

Noticed a damp patch under the Bongo yesterday and on investigation it seem to be a slight leak from the auto box sump.

It looks like someone has tightened three or four of the bolts too much and nearly stripped the threads so that they won't tighten properly.

My query is, can the gasket be reused or does it need a new one if removed? I'm planning to take it off and seal it well with Hylomar and see what happens. Failing that it looks like I will have to see if it's possible to drill and tap the holes bigger and put larger diameter bolts in the dodgy ones.
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helen&tony
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Re: Gearbox gasket

Post by helen&tony » Wed Dec 28, 2011 1:46 pm

Hi
I've hear that a lot of people re-use the gasket...sealing with Hylomar sounds like a plan...I think I'd try the same as you suggest, and try re-cutting a thread...the pan is not really load-bearing to any great degree
Cheers
Helen
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teenmal
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Re: Gearbox gasket

Post by teenmal » Wed Dec 28, 2011 2:30 pm

briwy wrote:Noticed a damp patch under the Bongo yesterday and on investigation it seem to be a slight leak from the auto box sump.

It looks like someone has tightened three or four of the bolts too much and nearly stripped the threads so that they won't tighten properly.
My query is, can the gasket be reused or does it need a new one if removed? I'm planning to take it off and seal it well with Hylomar and see what happens. Failing that it looks like I will have to see if it's possible to drill and tap the holes bigger and put larger diameter bolts in the dodgy ones.
Hi briwy,

If the bolts/casting threads are stripped I would tap and fit new bolts.It should be possible to do this without removing the sump.

Cheers.
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briwy
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Re: Gearbox gasket

Post by briwy » Wed Dec 28, 2011 2:33 pm

Thanks folks.

Think I'll try the Hylomar first as the leak isn't bad.
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