Timing belt jumping off of car *help*
01-31-2014, 04:09 PM
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Timing belt jumping off of car *help*
Hey guys,
I have a customer car, 1994 Honda civic hatch with an LS motor setup, bottom end is stock. Head has crower valvetrain and cams. The car had a loose timing belt when it came to us (head has been milled, not sure if that is effecting this).
We replaced the water pump, tensioner, tensioner bolt, and timing belt all at the same time. For some reason, the belt still seems to be fine when we crank the car and it idles, but on a test drive, it continues to come off the cam gears (anywhere from 5 minutes to 30 minutes during the drive). The tensioner is still tight after the belt comes loose. The customer purchased an aftermarket vibrant tensioner to help resolve the issue, but the belt came loose again and made two of the bolts on that aftermarket tensioner snap!
Any advice is much appreciated! We have done a ton of timing belts and never had this issue!
Below is a video of how the timing belt looks when the car is running. There is no slack in it when the car is idle, but you can see slack when the car is running.
--Ryan
I have a customer car, 1994 Honda civic hatch with an LS motor setup, bottom end is stock. Head has crower valvetrain and cams. The car had a loose timing belt when it came to us (head has been milled, not sure if that is effecting this).
We replaced the water pump, tensioner, tensioner bolt, and timing belt all at the same time. For some reason, the belt still seems to be fine when we crank the car and it idles, but on a test drive, it continues to come off the cam gears (anywhere from 5 minutes to 30 minutes during the drive). The tensioner is still tight after the belt comes loose. The customer purchased an aftermarket vibrant tensioner to help resolve the issue, but the belt came loose again and made two of the bolts on that aftermarket tensioner snap!
Any advice is much appreciated! We have done a ton of timing belts and never had this issue!
Below is a video of how the timing belt looks when the car is running. There is no slack in it when the car is idle, but you can see slack when the car is running.
--Ryan
01-31-2014, 06:55 PM
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Re: Timing belt jumping off of car *help*
Got it guys! Took it apart and put the belt back on and all is fine. I have no clue what was causing the slack?!
01-31-2014, 08:03 PM
#4
Re: Timing belt jumping off of car *help*
"This video does not exist."
An improperly installed timing belt will cause slack. Improperly machined timing components will cause slack. An improperly adjusted tensioner will cause slack. There's a reason for the very specific install and tensioning information in the FSM.
An improperly installed timing belt will cause slack. Improperly machined timing components will cause slack. An improperly adjusted tensioner will cause slack. There's a reason for the very specific install and tensioning information in the FSM.
02-01-2014, 01:35 AM
#5
Re: Timing belt jumping off of car *help*
I've also heard that if the tensioner isn't located on the alignment dowel, or the pivot point for the tensioner.. that it will cause the belt to not properly tension up and can cause the belt to jump off at random..
Never personally seen this happen but I've heard it mentioned before..
Never personally seen this happen but I've heard it mentioned before..
02-02-2014, 03:12 PM
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Re: Timing belt jumping off of car *help*
you didn't read the thread. he added a secondary vibrant tensioner and the belt slack sheered the bolts off that mount it in place.
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