Locking the cam shaft on 8v twin spark - Alfa Romeo Forum
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Locking the cam shaft on 8v twin spark

Hi, I'm sure this will have been covered before but I can't find any info on it.

I am about to change the head gasket on 8v TS ('89 75). I see there are lots of sources of the cam shaft locks / blocks for the 16v versions but none I can find for the 8v.

Totallyalfa.com have a tool for clamping the variator but how do i go about securing the exhaust camshaft? There is no mention of a locking tool in the workshop manual just how to reset the timing with a dial test indicator etc.

Does such a tool exist? If not how have others done this?

I have removed heads before but only on old Land Rovers not on these fancy modern ohc engines...

Thanks in advance.
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the cams are marked, as are 2 bearing caps.

you don't lock the cams, just line up the marks
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If it's like the earlier 8v twin cam engines it should also have vernier pulleys for dialing in the cam timing once the chain has been tensioned.
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the exhaust cam does, but the cams are originally marked after fitting and dialing in at the factory

I don't remember if the intake cam pulley is keyed or not
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On the 8v TC they both were, and I think they would need to be as the final tensioning of the chain is done with the engine running and both cam positions can change relative to TDC. Once the chain's tensioned, find TDC then check the marks line up on the inlet cam and bearing cap and adjust if you need to and then check marks on the exhaust cam and bearing cap and adjust if necessary.
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Thanks for your help with this. Reading through the manual again it doesn't look too bad. I think it assumes that the head has been stripped and the timing needs to be reset from scratch. As I'm just lifting it to do the head gasket I should just need to check the relative alignment of cams, No1 TDC on crank and distributors when replacing.

The manual details setting up the variator and adjusting the exhaust camshaft. I don't think I would need to do this as the camshaft will not have moved relative to the variator.
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cam , cam or timing , cylinderhead , locking , shaft , spark , timing , twin

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