Timing chain keeps jumping the timing - 1992 Yamaha FZR 600

could be --chain stretched --gear/tooth failure --

If it is a chain. Check the shear pin/moon key on the crank shaft.

Are you saying that after changing the chain is it doing this? If so, you probably have the crankshaft 180 degrees out of sync with the cam. If not, the chain tensioner may have broken and the chain jumped time.

if the car keeps jumping 2 or 3 teeth on the timing, it's possible that you need a new timing chain/belt and tensioner.

Both the 2.2 and the 2.4 engines use a chain, not a belt.
A chain could still be faulty, but I doubt it would jump teeth unless the tensioner failed to keep it tight.

no way of doing so. need to remove cover. i have been doing this since 1996 and have never seen chain driven nissan jump timing. have seen some timing belt cars jump, but never chain driven engines. i think you have something else going on. i have done many and many timing chain jobs on frontiers and maximas, but not for a timing chain jumping issue. upper timing chain shoes wear out and engine gets noisy. i have to say i have seen some with the primary chain stretched a bit, but car still ran fine.

HE needs to stop trying to start the engine if it keeps jumping time. Replace the tensioner or make sure the older one is installed correctly by the book. If he keeps trying to start the engine and jumping time and the cam shaft has a valve open in the head a piston can com up and hit the valve and then the valve will be bent. And you will be screwed and a head rebuild will be in your future. I have been a Certified Mechanic for over 25 years and if this guy is truly certified he should not be having this problem. Make sure he is and has the shop manual for your car. If not purchase a chiltons manual for your car specifically. May cost you $20.00 it will have the info he needs and throw it at him. A lot of times it is best to replace the tensioner when doing a timing chain repair. You already have the engine timing cover and other parts off the front of the engine. If there is any play in the bearings of the tensioner replace it.

Yes the tensioner is what keeps pressure on the chain or belt to keep it tight.If the chain or belt gets too much slack it could jump a tooth or two or worse it could come off while you are driving,causing severe engine damage.

sounds like it jumped time when you stop cranking it starts deiseling if that is whats going on then yeah it prolly jumped time wich means your timing chain tensioner is prolly umm junk and you should prolly put a timing chain in it too

when you adjust the tension of the chain, ensure the tip of the bar has upward pressure applied to it. This ensures the tension is correct while in use. Improper tension adjustment can cause the chain to loosen in use and "jump" off the bar. Improper adjustment can also stretch the chain leading to the same result.

please take the time to give this solution a fix ya rated

clarkco