Quote:
Originally Posted by Clifford Pope
But the engine surely doesn't stop dead if the belt snaps - crankshaft and cam shaft will go on spinning, and obviously will slow down at different rates?
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The cam shaft WILL stop as there is nothing to drive it if the timing belt breaks. Whether the crank keeps turning is another matter, usually on a manual it is forced to so will damage the valves every time the pistons go up and down but on an auto, stops more or less instantly.
Don't forget the reason the valves get bent is because of vale to piston contact, it can in certain cases put holes in pistons because of being forced to contiue turning unless you put the clutch in rapidly.
Quote:
Originally Posted by Derek UK
If the belt breaks the cam will stop turning straight away, certainly much quicker than the crank. B200 is interference and B230 isn't. B230 belt changes have been done at the side of the road. I've not heard of having to re tension the belt after 600 miles, that's what a tensioner does.
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The tensioner isn't automatic!
It is a service requirement by Volvo that the belt is retensioned 600 miles later.
The tension has to be set manually once the tensioner locknut is slackend half a turn or so.
If you don't retension it, you run the risk of it becoming loose in service and stripping the teeth.
No teeth = no drive to the camshaft!