Furyous
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| posted on 14/11/12 at 07:04 AM |
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Clutch Cover Bolts
What kind of bolts should I be using to mount the clutch pressure plate to the flywheel? Obviously it's not somewhere to cut costs on with
cheese bolts, but Mazda have said the official bolts will be £5 each.
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Mr Whippy
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| posted on 14/11/12 at 07:12 AM |
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Their probably fine thread too and use locking compound, I think they are higher than 8.8 though I have only ever used the ones that came with the
engine, there's usually 3 pins that take the load too. Unless you have a huge engine I think overall there is little load per bolt
£5 a bolt is very greedy, probably only cost 30p each for them to buy
[Edited on 14/11/12 by Mr Whippy]
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britishtrident
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| posted on 14/11/12 at 08:06 AM |
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Grade 8.8 is fine as is 10.9 the bolts aren't particularly highly loaded, normally OEM bolts come ready painted with blue thread
lock.
Balance is the most important consideration manufacturers bolts are likely to have a tighter weight tolerance than normal run of the mill bolts, this
is no problem just check the bolts are close to the same length and weight.
The clutch pressure plate to flywheel joint basically is the same as a flange joint drive in that drive is transfered by static friction
between the two surfaces. The dowls don't transmit drive they are fitted to accurately centre the pressure plate.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Furyous
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| posted on 14/11/12 at 08:11 AM |
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Thanks for that. The cover is currently held in place with some 8.8 hex head bolts so if they're ok I'll put some Loctite on and torque
them up. Should I use washers/spring washers?
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Mr Whippy
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| posted on 14/11/12 at 10:13 AM |
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quote:
Originally posted by Furyous
Thanks for that. The cover is currently held in place with some 8.8 hex head bolts so if they're ok I'll put some Loctite on and torque
them up. Should I use washers/spring washers?
Yeah all the ones I have ever done had spring washers, really don't want them to come loose and there's no way to wire them or inspect so
best to do all you can
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britishtrident
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| posted on 14/11/12 at 06:02 PM |
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Spring washers worked well in this application but spring washers are well out of fashion these days manufacturers use flange head bolts, These
days clutch pressure plates are often held with male torx flange head bolts.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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