Question about 1999 Nissan Sentra
Bought the tractor as second hand, previous owner tried to fix it but couldn't get the timing right.
Setting valve timing isn't rocket science. Step 1 is to turn the crank until the timing mark on the pulley is aligned with the mark on the block. If you can't find the timing marks remove the no 1 spark plug or injector. Place a straight piece of wire into the hole and slowly turn the crank until the wire is pushed right to the top. At this point there will be a slight movement of the crank either way where no movement is felt or seen on the wire. This is called top dead centre (tdc) on no. 1 cylinder. By the way, no 1 cylinder is always the cylinder nearest the radiator.
The next step is to turn the camshaft - assuming the tappet cover has already been removed - and to watch for the point at which the no 1 cylinder's valves "rock", that is, the exhaust valve closes just before the intake valve opens. Watch the tappets, they will alternate as you move the camshaft, which by the way is not easy to do since you have to overcome the compression of the valve springs.
Once you have no1 tdc set and no1 valve set rocking, attach the timing chain and replace the spark plug / injector.
If your tractor has a petrol (gasoline) engine, remove the distributor cap. See that the distributor rotor is pointing to the no 1 spark plug wire position on the cap. Turn the engine anticlockwise just a mite off tdc, and see if the point gap is just breaking.
If all these timing issues are sorted, the engine should kick over without any hassles.
Have fun, mechanics are a gas.
Posted on Nov 22, 2014
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Posted on Jan 02, 2017
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