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there is a mark mark on the front of each cam which lines up with a mark on the front cam bearing cap, see haynes manual and this will become clear, if you don't have air wrench to remove crank bolt take off starter and wedge ring gear on fly wheel, so it locks solid then you can remove crank bolt,when you retighten crank bolt make sure it is tight, if it works loose the keyway on crankshaft shears then the timing is lost, engine stops, and you have to strip off timing cover and chains to replace keyway
 

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You'll need to explain a bit more about what you're trying to do I think - you can't set TDC for example, when the piston (no.1 generaly speaking) gets to T(op)D(ead)C(entre) it gets to TDC. Removing the crankshaft pulley nut has nothing to do with it - are you talking about cam timing perhaps? If you don't know what you're doing leave this well alone cause it could cost you loads if you get it wrong.
 

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Ahhh, Ok - you'll almost certainly need an air gun and (30mm?)impact socket to remove the crankshaft pulley bolt firstly (doesn't matter if everything moves cause you can put the pulley nut back in and turn the engine over to get everything to line up with the timing marks on the head), then what I would recomend is that you mark the relative positions of the existing chains to the relevant timing marks on the sprockets with a dab of paint. Then you can replicate these marks on the new chains and on replacing know that you haven't altered the cam timing. Obviously you do this once you've removed the timing cover and can see all the sprockets!!
 
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