Head Bolts

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Head Bolts

Post by Eightpot on Fri Oct 24, 2014 2:51 pm

My cylinder head is currently in the machine shop being pressure tested for any internal cracks after being found to be un-warped after the little drama n the hard sgoulder of the M3. Phew. But he did raise an eybrow when I told him that as far as I was aware, the engine doesn't use stretch bolts.

Rapid question:

The head bolts. Are they stretch bolts or regular?

Ta in advance.

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Re: Head Bolts

Post by xxemaphorr on Fri Oct 24, 2014 4:57 pm

The manual makes no reference to replacing the bolts on strip/rebuild also the diagram doesn't label it as a non-reusable part (or at all even!)

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Re: Head Bolts

Post by HighlyJetted on Fri Oct 24, 2014 7:38 pm

I always re use them, and I always skim the head as they warp in very funny ways I cant measure, but you can see it as its skimmed pass by pass.
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Re: Head Bolts

Post by Eightpot on Sat Oct 25, 2014 3:35 am

Thanks for that. The primary cause of failure on my engine is increasingly looking like the head bolts were insufficiently torqued down followed by a dodgy jubilee clip on the thermostat housing. Need to look at the accuracy of my torque wwrench...

Interestingly, I did notice when putting a staight edge over the deck of the block, that the steel liners stood proud of the aluminium.

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Re: Head Bolts

Post by scotia on Sat Oct 25, 2014 7:43 am

daihatsu didnt use strech bolts i heard from a friend of mine who has had several different daihatsu,s.
i know they didnt use them on my current car (hijet) and didnt on my previous (charade GTti).
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