timing chains are a biatcha of a job to do.... best thing to do, get a kit off ebay.....throw the top tensioner away and order a nissan one for it.
lift off the rocker cover, prop the engine up with a jack. remove the front left hand (drivers) engine mount. remove main pulley, remove water pump remove the sump (you will need the exhaust and bottom engine mounting brace off for this) and oil pump cover (mainly the whole side of the engine)
whilst this cover is off cut off the little lug that sticks out at the top of the cover.. (trust me it will make the job a million times easier later on)
now, remove the top tensioner using the 2x 10mm bolts that hold it on and check the extension of it. if it has two huge groves in it and has extended all the way out, its time for a new top chain..
check the bottom one in the same way (allthough i just changed the top one and all the tensioners and guides)
make sure the engine has cylinder 1 at top dead centre (either on the main pulley you just removed or with a long screwdriver through the spark plug hole in cylinder 1)
remove the top pulleys off the cams and the idler gear off the head. the top chain should now just fall off and be hung on the guide on the right hand side of the head, remove this using a suitable allen key.
as the idler has both top and bottom chains on it the bottom one should now be slack and able to be removed..
inspect everything, all new pulleys will come with your kit but you will still need to make sure they are going in the right place.
the fitting is pretty much the reverse of the removal..lol just you need to make sure that the cams are set in the correct orientation (using the little coloured links on the chain)
bobs your uncle...lol
nearly, mine took me a week..lol
