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Hi Stvns, If the engine has a distributor align the pulley and pointer (both are on the front of the engine, the timing marks are on the front timing cover and the other on the crankshaft pulley.) paint a dot of white paint onto the pulley and another onto the 8 degree BTDC for ease of viewing. Find and have the correct size spanner (wrench) ready to loosen off the locking bolt of the distributor. Connect a strobe timing light, start the engine and move the distributor until the two white dots align. Tighten up the locking bolt and remove the strobe. If it does not have a distributor the timing is automatically adjusted. If it is out, have the vehicle scanned and you will probably discover that the knock sensor has become defective. The knock sensor is responsible for 'listening for ignition timing knocks and adjusting the timing. Regards John
the timing marks are on the camshaft sprockets and also on the timing chain there should be three silver markings ,those markings go alighn with the markings on sprocket also remember to put #1 piston top dead center
The cam has an access cover that allows you to see that the timing
points line up. You have to look at the cam from the end on the
passenger side and see that the points line up. This is done by making
sure the lower pulley is on Top Dead Center and then look to see that
the cam and the pointer line up with the inspection cover removed.,,,,,,, I copied this from somebody else, I thought I would pass it on. I have a Nissan Sentra, but I am not familiar with the cams. Hope this helps.
if you mean the timing chain then on your crank gear and your cam gear there will be a mark on each sometimes they look like a dot the dots need to look like this for perfect timing ( . . ) this will be there closest position. Your crank turns once all the way around (360 degree) and your cam gear will do two complete revolutions to the one of the crank gear. so when you set your marks as above when you turn the crank one half turn the mark on the crank gear will be at the bottom and at the same time your cam gear will have made one complete revolution, so when you turn the crank another half turn your cam would have turned again a complete revolution and the two marks should be at their closet point again.
Hi there,
you will need new upper timing chain and sprockets. Common problem on altima your year. Nissan has TSB for it. First they had us remove the upper timing chain guide, but after that, they had us replace all top chain components.
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