Fractured cam pulley's
- Thread starter Muzz66
- Start date
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CLuTZ
Diamonds are forever....
What brand were they? ****** materials?
rob323
Don't drive it, RALLY it!
If stock steel ones are cracking, then I definately would NOT replace them with alloy ones until you have figured out the problem.
That I have not done as yet.OK once again I haven't given enough info thought my sig would have been enough.It is a n/a 4g63 hence not an import.the pulleys run true when running.I certainly can't risk driving with cracked pulley's so how am I going to figure this one out.Has anyone experienced this prob?I have no idea how many k's the motor has done prior to a rebuild so pos and more probable they would not have been replaced.the head has been recently rebuilt by UMR engines in Bris.It is running an Evo belt.(Gaites)Maybe a dodgy tensioner?Over tensioned?Over revving and you would think this had been a prob before and someone mentioned it.I certainly would not have been the first to do this lol.The motor is very free revving and sounds sweet with no vibes. Maybe they are just dodgy pulleys I def wont be spending money testing if can in fact do.Surely the alloys are stronger.This motor could have done 300,000 k's before its rebuild for all I know. Unfortunately I don't know it's history.rob323 said:
I doubt it would be due to overtensioning, the pulley has no thread in it and is only being sandwhiched. If overtensioning of the bolt was the case I would expect to see the bolt snap first or pull the thread out of the camshaft.
I was about to suggest that because of the centrifugal force, dirty oil/moisture can streak outwards from the bolt hole and look like cracks.
I've never heard of a stock pulley cracking, I would be changing it before driving too much further if indeed it is cracked. You could always just run a bead of weld along the crack, then take it to a workshop to remove the belt, change the cracked pulley and put the belt back on.
I was about to suggest that because of the centrifugal force, dirty oil/moisture can streak outwards from the bolt hole and look like cracks.
I've never heard of a stock pulley cracking, I would be changing it before driving too much further if indeed it is cracked. You could always just run a bead of weld along the crack, then take it to a workshop to remove the belt, change the cracked pulley and put the belt back on.
I have a set a of Adj Alloy's I haven't fitted as yet.As for over tensioning I meant the belt tension not as you suggested which would be spot on.but on second thoughts you would think that with the auto tensioner that cant be an issue.It could be as simple as the motor rolling over in someone's shed and cracking.As I have said before unfortunately I just have no idea of it's history. Hey thanx guy's for all your input so far. :thumbsup:Jonson said:
Oh Ye the crack is horizontal across the spoke not running from the bolt outward.And is on the inlet side
