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I found this in the oil pan of a 2 litre Alfa dual cam engine. Anyone have an idea what is and where it goes? It looks as though it had a small screw holding it in place somewhere and it is hardened
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It's the wedge for the timing chain tensioner. This is held in place by a special bolt (see picture). You can see the bolt head on the outside of the engine: it's on the front face of the cylinder head, towards the inlet side.

You slacken the bolt to adjust the timing chain tension, then nip it up when you've finished. Trouble is, if you slacken the bolt too much (or remove the bolt completely), the little wedge that sits on the end of the bolt falls off into the engine - which is what's happened with yours.

It doesn't necessarily mean that your timing chain tensioner has no wedge: it could be an historic mishap, where the wedge was accidentally lost in the engine but then replaced with a new one. The only way to find out is to remove the cam cover and see what's going on with that tensioner...

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