1990 Nissan Sentra GAI6i engine keeps breaking timing chain guides and timing chain covers. Car is great but replacing timing kits (chain,gears,tensioners,guides) and timing cover (two times) is expensive and labor intensive. Are there parts that should be used over others? Is there a TSB covering how to fix this problem.
Have you checked the oiler supply to the timing chain and the chain tensioner Just a thought. The guides usually only break from the lack of tension on the chains.
SOURCE: nissan sentra ser spec v
free the engine from the compressor and then remove the plug then first insert the drive belt on the smaller pulley side and after that try inserting the belt on the larger pulley side slowly by rotating the pulley slowly by stretching the belt with a rope
SOURCE: Replace the timing belt tensioner on a 1990 Nissan Sentra
The belt tensioner is located under the timing cover. It is 1 1/2 round and about 3/4 inch with a groove in the middle where a bolt is tightened. When you remove the timing cover you will see the timing belt, the camshaft sprocket and the crankshaft gear. The timing belt goes around these components.. The belt tensioner is loosened and the new timing belt is placed. The sproket also has to be replaced if it is broken. Be careful to notice the little marks that are aligned on the sproket and above the camshaft.. They can be small arrows that have to be aligned exactly the way you took them off. replace the belt and you tighten the tensioner so the belt fits snug and tighten the bolt in the middle of the belt tensioner. It is not too difficult, if you know something about mechanics. If you don't, you will be better of taking it to somebody who does know.
SOURCE: timing degree nissan sentra
Step1 First step is to open your hood on your vehicle and locate the distributor.
Step2 Next loosen your distributor just enough that it will turn from side to side with some resistance.
Step3After Loosening the distributor take a piece of chalk and mark on theharmonic balancer the timing mark so it can be seen easily.
Step4Then take the timing light and connect it to the battery and the Numberone spark plug wire. Then have your helper start the vehicle while youshine the timing light on the harmonic balance and the timing mark onthe timing chain
cover.
Step5The Timing Light will illuminate the mark on the harmonic balancer whenthe Number one cylinder is firing. The mark should correspond to thetiming mark on the timing chain cover. You can then adjust the timingforward or backwards by rotating the distributor ever so slightly.
Step6 When you have the timing where you want it then shut off the engine and carefully tighten back down the distributor without moving it.
SOURCE: 1996 nissan sentra
Using a short socket of appropriate metric value, and a pry bar; Push the pry bar toward the firewall to loosen the tension on the belt. It's not that hard once you buck the initial spiral spring pressure of the tensionor. I have even pryed against the tensionor with a blunt heavy bar and moved it enough to free a belt.
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