How do I know if the cam belt is ok? - Alfa Romeo Forum
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(Post Link) post #1 of 7 Old 02-05-09 Thread Starter
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How do I know if the cam belt is ok?

Ok, I brought this GTV thinking the cam belt was gone, but having removed the belt covers, I find the cam belt is ok but the balance belt and tensioner is wrecked. So the question is, how do I know for sure the cam belt is ok? Is the someway I can look at the cam position to the pulley position and know all is ok or indeed, all is knackered? Any help will be gratefully recieved.

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Re: How do I know if the cam belt is ok?

As you have got it open it would be worth changing it along with anything else that the damaged balance belt effected, especially if you do not know when it was last done. It is better safe than sorry when it comes to cam belts.

It is looking good.
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(Post Link) post #3 of 7 Old 03-05-09 Thread Starter
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Re: How do I know if the cam belt is ok?

Oh I am going to change it for sure, but I don't want to do it and then find the head has to come off because the belt had slipped and damaged the valves. Is there any way of looking at how it is positioned and saying "it's ok" or "thats wrong"?
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Re: How do I know if the cam belt is ok?

You could try taking the cam cover off and looking at the heights of the tappets with the valves closed.


If they sit lower into the head when the valve is closed then the valve is bent.

You will need to turn over the engine by hand to do this obviously, unless you have the belts off and you can remove the cams.
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Re: How do I know if the cam belt is ok?

Cheers Sy, I will go for that. I have the cover off now, I just don't know if you can look at the position of the followers for each cylinder and be able to say it looks right.

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Re: How do I know if the cam belt is ok?

Its a bit difficult to see from that angle TBH Mitch, you need to get a view under the cams from a lower angle.

IIRC the tappets should stick up about 8-10mm with the valve closed.

You can tell if the valve is meant to be closed by looking to see if the lobe is poking down at the tappet or poking up or sideways etc..

HTH.
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(Post Link) post #7 of 7 Old 07-05-09 Thread Starter
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Re: How do I know if the cam belt is ok?

Ok, having talked to my indie, I am going to get the cam locks, find TDC on cylinder 1 and see if the cam locks fit. If they do then the timing should be ok. I will also do a compression test. If both these checks are ok, I will assume the cam belt has not slipped.
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