please help....

armed with the info from this page: http://mb190.tripod.com/tech/timing.html I attempted to renew my timing chain and tensioner on my 2.5 16v today.

I removed the alternator and drive belt. i removed the old tensioner unit and the valve cover. i removed one link from left hand side of exhaust cam as viewed from the front, I connected the new chain to this and started to turn the engine clockwise via the crank nut, whilst holding the 2 pieces of chain tight.

this is where it went wrong.....

instead of gliding smoothly round, feeding the new chain in and keeping the cams in perfect unison, the chain slipped over the exhaust cam (the one on the left as viewed from the front) whist still turning the cam on the right of the engine (as viewed from the front)

what has now happened is I cant turn the engine over any more, I assume because the cams got turned at different rates/amounts I have something making contact somewhere internal???

It was turning over real easy ( i took the plugs out to help me) but now it feels as if I am up aganst something fairly hard, I dont want to try to run it any more in case I bend something.

so, what do I do? the new chain is approx 1/3rd of the way round, and I cant turn the engine over in its present state to either retrieve it or feed the rest iof the new chain in.

The only thing I can think of is to remove the cams to allow all the valves to close?

Any help greatly appreciated.

and to think I was planning on driving to work monday morning.....

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Steve Howson

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www.mercedes-cosworth.co.uk