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it is time to change bearing on that pulley
The crankshaft itself has no marks, the crankshaft pulley has one, it's white color. The same is true for the camshaft, it has no marks. But the camshaft pulley has a hole in it. That hole must alighed with the mark behind the pulley and the crankshaft should alighed with its own mark and the camshaft in the same time.
On your top and bottom pulleys ,you have timing marks,they should line up when time is correct.
According to the history of the Nissan Quest Vg30e engine from 1993 thru 1998 these group of engines were non-interference engine, so if the belt breaks it will not damage the valves. This feature was demanded by FORD from Nissan before FORD agreed to used this engine in their ViLLAGER and Nissan Quest vans in the time of their joint venture.
The marks are located on the Cam Shaft Pulley... should be easy to spot... make sure that you have the proper timing light, and do your reserach so that you will know exactly how to time the vehicle... putting it at TDC and linning up the Cam Shaft Pulley.
On the pump pulley there are 3 marks. A, B, and unmarked DOT. We don't know to what that must correspond to on the cam. Can anybody ...
The engine on a Nissan Quest van may quit when stopped if the ignition time is incorrect, the idle speed is set too low, or the air filter is clogged. Performing a full tune-up will help to resolve these common problems.
Most American made cars have the timing mark on the crank pulley. I say most, because I'm not familiar with some import models and how they time their vehicles or if they use any marks at all.
When It no longer hold proper tension if the belt is squeaking then it is probably time to change it
Yes it does. It needs to be replaced every 105 K. You should also replace the water pump at the same time regardless of what Nissan may say.
Connect the positive and negative cables on the timing gun to the corresponding posts on the battery (will be marked with + and - signs) connect the sensor on the timing gun to plug wire #1. any where on the wire will do, it is just an external clamp that will read through the cable's sheathing. First locate three sequential marks on the crank pulley (found on the front of the block.) you will also see a pointed tab hanging over the crank pulley. Point your timing gun at the tab and pull while the car is running (let the engine reach proper temperature before timing) The middle of the three marks on the crank pulley should line up with the pointed tab every time the light flashes.
Timing marks determine if the car is set on TDC(Top Dead Center). Just to make sure it is in time use a Timing Light. The timing marks are located on the sprocket under the valve cover and on the crankshaft. Timing marks determine if the car is set on TDC(Top Dead Center). Just to make sure it is in time use a Timing Light. The timing marks are located on the sprocket under the valve cover and on the crankshaft.