People seem to think the woodruff keys is there to aid rotation. It's not. It's only a locator for the pulley. The bolt needs to be wound right up or chances are the woodruff will fail and cause an expensive bill...
I have been speaking to a few people about XE engines in general over the last couple of months,and it seems a few have had problems with the crank pulley bolt coming loose and knackering valves etc.I suppose it could be down to not torquing it down correctly.My question is can anyone foresee any problems with adding some stud loc to the bolt?.Has anybody know of this bolt coming loose on a properly torqued one?
Don't use stud lock.
Never had a problem with one coming undone, however some are stretch bolts and should NOT be reused. buy a new one from main stealers if you are
unsure and do it up to the correct torque/angle.
Given the torque spec is something like 250Nm + 40-50deg I suspect that those that have come loose have not been done up tight enough or they have
re-used an old bolt (or both). To the get crank pulley bolt done up I always borrow a 750Nm torque wrench from work and turn it right up after
I've done the 250Nm bit.
I think SBD say to lubricate the threads not use threadlock.
Chris
quote:
Originally posted by jollygreengiant
buy a new one from main stealers if you are unsure and do it up to the correct torque/angle.
New bolts are available from Autovaux. Got one last month...
People seem to think the woodruff keys is there to aid rotation. It's not. It's only a locator for the pulley. The bolt needs to be wound
right up or chances are the woodruff will fail and cause an expensive bill...
XE crank bolts should be oiled for assembly and loctite should not be used. Also they are not a stretch bolt - would take some stretching wouldn't they!
If they are not stretch bolts then why do they need replacing.
They need replacing because when you do them up you 'exceed' the bolts elastic limit. I think that by definition that kinda makes it a
'stretch' bolt.
Got mine from a vauxhall dealer a month or so ago no problem.
quote:
Originally posted by cidersurfer
New bolts are available from Autovaux. Got one last month...
If you have any doubts ,torq your new bolt to recomended load drill a 1 16 hole one flat to the other and one into the pulley and wire lock . have got picks if your not sure wot i mean or how to wire lock
The bolt should be replaced as its cheap enough insurance and the torx heads get mangled after one undo anyway.
Don't use threadlock, you'll NEVER get it undone again.
lockwire would be as much use as a chocolate fireguard on this bolt!!!! 
if the bolt comes loose it shears the entire keyway out, don't think a bit of lockwire is going to help much!!!