Questions about jumped timing and bent valves

[dead_95tsi]

I just had a shop drop in a newly rebuilt 6 bolt motor. The car started up and drove over a dozen times fine. I finally drove it back home from the shop which is around an hour drive. Car drives perfect, great idle, everything seems great.The next morning I start it up only to hear a grinding noise. The engine doesn't crank and after replacing the starter with a new one, the same grinding noise is still there. I am worried that the timing belt jumped, but have a few questions just to clarify everything. Is it possible that the belt jumped on start up, even though the motor didn't crank at all but only made the grinding sound? What would a motor with bent valves sound like when starting, would it turn at all or just make that grinding sound i specified? How do I check if my timing belt jumpe d a few teeth? Thanks

 

[RossY]

Well, when my timing belt skipped it was on startup. I had it running for about a week before that. Went out to start it one morning and it cranked and made a really weird noise and it turned out that the auto tensioner had gone bad. After that it would still crank but just really fast, which im assuming was due to 0 compression. I really don't know about the grinding noise your getting. If you want to check if the timing skipped then look on your cam gears and there should be two notches in the teeth. If those notches don't line up or if when they are lined up your crank pulley doesn't line up with the timing mark, then you've probably bent valves.

This site may help:

http://www.vfaq.com/mods/timingbelt-2G.html

 

[boostedinaz]

Do a compression check. If the valves are bent them they wont seal the combustion chamber and you will have no compression. You can also pull the vlave cover and look at the rockers. Turn the car over by hand, with a ratchet on the balancer, and they at some point should all have tension on them. If there are some that are lose then that valve is bent and not seating correctly. The only perfect way to knwo is to pull the head.