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timing belts, what happens when they fail? 

 

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 Post subject: timing belts, what happens when they fail?
Posted: Wed Feb 23, 2005 12:47 am 
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curious to know, will my ef 6cyl survive a broken timing belt if it breaks, or will it also break/damage anything else, piston/valve, if it lets go?

i had a telstar a few years ago, timing belt broke at 100kph with no other damage done, hopefully the falcons the same
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Posted: Wed Feb 23, 2005 2:46 am 
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They have a chain and should be replaced when noisy..If they break you could loose your whole engine...
Belts should be replaced at 100.000 lmrs..
I guess chain can go further depends on service history and abuse / driving style...

 

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Posted: Wed Feb 23, 2005 9:09 am 
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thanks for that, never heard of a chain letting go, should have looked in the manual i suppose, i just thought bels are so common these days it'd be a belt
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Posted: Wed Feb 23, 2005 1:29 pm 
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Belts are common on free revving engines.
because the falcons are not ie: the valves drop lower than the maximum height of the piston, they use a chain for better reliability.
as a rule of thumb, if you blow a head gasket, replace the timing chain while your at it. The results of valve and piston colliding at 2000rpm are catistrophic!!!

 

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Posted: Wed Feb 23, 2005 2:24 pm 
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I've snapped 3 valve springs, but never done a timing chain.

Only 1 of the snapped springs caused damage. All depends where the spring breaks.

 

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Posted: Wed Feb 23, 2005 7:54 pm 
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My brother had a Laser with some wizz bang turbo motor in it. He snapped a belt doing a burnout, at approx 5500 rpm and the only thing needing replacement was the belt. As a mechanic I thought it impossible but was I wrong.

 

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Posted: Wed Feb 23, 2005 8:07 pm 
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i would get it replaced before it lets go, something went wrong in the timing system in mums EA, it snapped 1 rocker arm clean off, and stuffed the rest bigtime, the lazer probably lived because the valves couldnt hit the pistons when the belt went, my ED has developed a noisy chain so im gonna start looking at getting it fixed (f**k its a big job, radiator+aircon condenser + all pulleys+ belts ahve to come off)

 

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Posted: Wed Feb 23, 2005 8:18 pm 
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it really depends on the car.. some cars bend valves every time, others never do, and some depends on theyre mood
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Posted: Wed Feb 23, 2005 8:20 pm 
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JOSE wrote:
(+aircon condenser )


Say what!!!

You don't need to remove the condensor. Remove the radiator and you will have more than enough room, to remove the harmonic balancer, belts, timing cover etc.

 

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Posted: Wed Feb 23, 2005 8:44 pm 
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dont ya? oh well my bad, i figured it would be easier with it out too

 

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Posted: Wed Feb 23, 2005 10:30 pm 
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JOSE wrote:
dont ya? oh well my bad, i figured it would be easier with it out too


You can if you want, but it'll save you the cost of de-gasing & re-gasing if you leave it in.

 

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Posted: Thu Feb 24, 2005 2:17 pm 
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If you want some pics, I understand EFFalcon had some horrific photos of what happens when piston meets valve.

*ughhh* makes me cringe just thinking about all those broken bits of metal.

 

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