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Water Pump Bolts Sizes And Thread


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#1 Mr Thirty

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Posted 06 September 2013 - 09:35 PM

hello all, 

 

My 1989 Mini Thirty (swapped for 1275 metro) has had an oil leak developing for several months.

this is my first mini, first car and first post.

 

Got a little ridiculous the amount of oil it was eating.

So timing cover gasket needed doing.

Finished sealing it up today.

 

when re-assembling i noticed the thread on one of the smaller nuts for the water pump has gone.

Does anyone know what size and thread they are?  And im unsure on where to get them, other than the net. Haven't drove her in almost 3 weeks and she's my only transport, need some asap.

Also...

When removing the engine mount i had a problem with one of the bolts, the thread was knackered and the nut was stuck in an infinite loop.

So, went out and got a nut splitter which i couldn't fit over the bolt due to engine mount blocking it, so borrowed an angle grinder and took the head off it.

After doing the gasket 

I stuck another bolt in to then have trouble lining the engine mount up.

So i figured i'd attach the mount first, then bolt it to the sub frame.

Went to undo it the bolt, and the thread has gone again. Same place, new bolt, new nut.

Any ideas why this keeps happening? wasn't particularly rough with it.  i don't like using an angle that close to my brake lines  (not enough space for a saw).

And I'm not sure if when i put some more oil in her if she'll leak again. so i really dont want that+another bolt thread kackered and some more dubious power tools involved

 

Sorry for the blabber but better too much than too little.

Thankyou!

 

 

 



#2 tiger99

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Posted 07 September 2013 - 09:30 AM

The water pump bolts will be 5/16" UNF, various lengths. You can measure the old ones, remembering that bolts are measured under the head. Or see here for the part numbers:

 

http://www.somerford...page=page&id=96

 

As for the mounts, I don't know why your new bolt should have failed. I assume it was a proper grade 8.8 bolt, 5/16" UNF, not a mild steel bolt from the likes of B&Q. It is vitally important that grade 8.8 bolts, and the matching grade 8 nuts, are used everywhere on a Mini, except for a few specials. And don't even think about stainless bolts, as they are unsafe in many applications.



#3 Mr Thirty

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Posted 07 September 2013 - 10:11 AM

Thankyou for the reply and the thorough advice. Much appreciated. Hopefully will be able to get hold of some today now I know what I'm looking for!




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