Belts breaking hurts camshafts? - Alfa Romeo Forum
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Scott Carter
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Belts breaking hurts camshafts?

I had a cambelt break on my 33 16v, at slow road speed. Before I knew what the problem was, I ran the engine and revved it. The mechanic who is repairing it tells me that I need replacement camshafts. I donít see how damage to the valves can result in damage to the cams. Surely the moment a piston hits a valve, the valve stops the cam turning immediately? The engine is low mileage and did not have any cam wear that could be noticed before. So I doubt that the mechanic has found that the cams are simply worn and must be replaced due to wear. Can a cambelt breaking actually damage a camshaft?

PS The mechanic canít find used camshafts and thinks that I might have to buy two reconditioned heads that he has found.
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I would say that the inertia in the cam will cause it to collide with the valve stems, and he may be right. Ask him for a look at the damage to the cams. You may see slight impact areas like hammer marks.
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<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:<hr /><font size="1" face="Verdana, Helvetica, sans-serif">Originally posted by Scott Carter:
<strong> Can a cambelt breaking actually damage a camshaft?
</strong><hr /></blockquote><font size="1" face="Verdana, Helvetica, sans-serif">Yes.
The shock that goes through the whole valve train is enormous and can damage the cams and their bearings. All you can do is ask to see them...
Someone like Kent or Piper Cams may be able to regrind them for you.
Have you tried ??
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a friend of mine had the timing belt snap on his Mk5 Escort diesel eek! ... ended up with a broken camshaft! eek!
one of the lobes literally SNAPPED, i saw it myself eek!
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