Weird
TorchedStealth
10-20-2006, 11:47 AM
So yesterday i had my timimg belt cover off to paint it (yeah i said it) and i noticed the timing belt was really loose. Like so loose that i could lift it up without too much pressure and it would jump 2 teeth, so i got the timing right again and i had to go somewhere quick so my dad told me to just drive it cause god knows how long its been like that. So anyways when i got home i went to show my dad and i felt it and it was perfectly tight. So what i am wondering is was it just the way te engine was shut off and sitting like that while it was parked? Cause i checked it 2 more times and it was tight both times.
Linebckr49
10-20-2006, 12:08 PM
that's what the hydraulic auto tensioner does. we have an automatic tensioner b/c different parts of the belt (stroke, cams) require different amounts of tension. some parts are really tight, whereas others are loose. i did what you did once: touched the belt, noticed it was a little loose, and when i moved it, it jumped a few teeth. so i had to reset the timing....not fun. my advice is not to mess with the belt if it looks loose.
but oddly enough, that's when most of our cars jump time: upon start-up. i forget the reasoning (ray pampena had some incredible insight on this) but if your tensioner fails, it will most likely do it after you turn your motor off. then when you go to start it again, the tension is not there, and so it jumps time and won't start. now sometimes our cars have jumped time when moving...that's another story. if your car jumps time while moving = heads, valves FUBARed.
when this happened to me, i was changing my valve cover gasket. when i reset the timing, i didn't know if the tensioner had failed or not, so i erred on the side of safety and just replaced the tensioner.
but oddly enough, that's when most of our cars jump time: upon start-up. i forget the reasoning (ray pampena had some incredible insight on this) but if your tensioner fails, it will most likely do it after you turn your motor off. then when you go to start it again, the tension is not there, and so it jumps time and won't start. now sometimes our cars have jumped time when moving...that's another story. if your car jumps time while moving = heads, valves FUBARed.
when this happened to me, i was changing my valve cover gasket. when i reset the timing, i didn't know if the tensioner had failed or not, so i erred on the side of safety and just replaced the tensioner.
VR43000GT
10-20-2006, 12:20 PM
:1:
That is exactly what I was going to say. There is a hydraulic tensioner in stead of just a mechanical "spring pulley" so it can be loosened and tightend.
That is exactly what I was going to say. There is a hydraulic tensioner in stead of just a mechanical "spring pulley" so it can be loosened and tightend.
talskinyguy
10-20-2006, 12:36 PM
It was how your engine was shut off. You just happened to be on the right part of the rotation where the valve springs were telling the cams to close in opposite dirrections creating slack.
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