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Cosworth jumped cam belt

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Old 17-03-2013, 09:25 PM
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PETESTURBO
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Default Cosworth jumped cam belt

Hi, has anyone experienced a cam belt jumping a couple of teeth when their fan belt snapped.
I suspect that the fanbelt went between my cambelt and distributor pulley as when I checked the timing marks the dis pulley was not on the correct mark, however the car still run!
I have also set the distributor up using the little mark and rotor arm.
I am paranoid that the car had been setup deliberately with the distributor pulley one or two teeth out and that the cam belt had not even slipped, would there be any reason for this?
Cheers Pete
Old 17-03-2013, 10:51 PM
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daz1968
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Seems unlikely if you have cam cover on as the fan belt can't get on the small timing belt pulley
Old 18-03-2013, 10:24 AM
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I had a belt 'stretch' due to oil contamination , it jumped off completely though on mine
Old 18-03-2013, 10:43 AM
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grcossie
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Originally Posted by opposite lock
I had a belt 'stretch' due to oil contamination , it jumped off completely though on mine
Happen to me years ago, inlet cam broke in 3 pieces
Old 18-03-2013, 04:07 PM
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Originally Posted by grcossie
Happen to me years ago, inlet cam broke in 3 pieces
Ouch! Was the head ok?
I remember an odd scraping noise over the music at 70. I thought the exhaust fell off or something , how wrong i was
Old 18-03-2013, 08:35 PM
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Originally Posted by opposite lock
Ouch! Was the head ok?
I remember an odd scraping noise over the music at 70. I thought the exhaust fell off or something , how wrong i was
Head was oki, new valves, guides and cam. Then it was up and go again
Old 18-03-2013, 09:20 PM
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james kiely
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i had mine go on a 35k car back in the day ,pulling out of a junction at 5 mph the car just juddered to a stop.the fan belt somehow got behind the belt and it stripped it then broke it .
every fookin valve was bent in it ,

everything was 100% standard from the factory at the time

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Old 20-03-2013, 01:13 PM
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It will still run but the ignition timing will be out.

Martin
Old 20-03-2013, 01:27 PM
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Fan belt???
Old 20-03-2013, 01:46 PM
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the position of the cam belt pulley that drives the dizzy & oil pump doesnt mater as the dizzy could have been taken out & put back in a different position. take the cap off & have a look if the rotor arm aligns with the notch on the dizzy housing.
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