jamesmartin
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usually the key ways are vital if you read up on diesel timing youll see cam will need to be when chain is tensioned at exact exhaust peak measure with a dial gauge ,which isnt just finding high point but points before and after and measuring the centerIf,as I suspect, mine is a bizarre mix of petrol and diesel engine maybe I have the incorrect sprocket which has put the timing out, and why it smokes so much!
After a quick search it looks like both 568474 and 276133 have both been superceded by ETC5551 which has just one keyway.
Does it need multiple keyways though? If the chain hasn't stretched and the tensioner is working properly then the relationship between the crank and cam sprockets should be correct and so the cam timing is correct. There is adjustment to alter the pump timing. I can't quite see from your picture but it looks like there is some kind of "subtle" adjustment between the central body and toothed part of that sprocket?