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Timing belt walk (yes another thread...)

 
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Old 02-12-2017, 09:44 PM
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Timing belt walk (yes another thread...)

Okay so here's the deal, yes I've have made many searches over the last week and the posts I find having the same issue do not post their fix. So that brings me here so I apologize for a "beating a dead horse post"...

I have a 98 prelude, am doing a jdm h23a dohc vtec swap with 45k miles. So far everything has gone well. Lots of new parts. Usdm oil pump, fly wheel, 1320 tensioner, crank positioning sensors, radiator, ect.

Anyway, got the motor in, started it up and the timing belt started rubbing and it frayed. Pulled the lower cover off and it was walking off and rubbing and it frayed against the balance shaft tensioner pulley. I have a new 1320 tensioner, I bought a new honda oem timing belt, same issue. Replaced the tensioner bolt, same issue. Tried adjusting the tensioner pulley maintenance bolt, same issue. I put the oem Auto tensioner back in with the same issue. Running this jdm motor off the usdm ecu requires the crank shaft timing belt cog. So I swapped to the jdm belt cog with and without the washer behind the cog and same issue. I've used the h22 and the h23 tensioner pulley assemblies with the same issue. I put washers behind the 1320 tensioner to shim it out, same issue. Tried doing it so loose that it almost jumped teeth. If I slightly pry on the back of the tensioner pulley it walks to the edge and stays. I've ordered a new tensioner pulley assembly but am afraid it won't fix it. Something is obviously missed aligned causing it to walk off, but I can't figure out what.

Any help would be much appreciated, I need to get her out of my buddies garage and want to drive it. I've had this belt on and off so many times with both style tensioners I can do it blindfolded.

I am turning the motor with a rachet by hand off the crank.

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Old 02-13-2017, 08:38 PM
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Re: Timing belt walk (yes another thread...)

Anyone???
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Old 02-13-2017, 11:43 PM
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Re: Timing belt walk (yes another thread...)

Your timing belt is too tight or worst case something is bent. You need to adjust it and walk the timing belt by hand via the crank until you find that sweet spot on the tensioner.




The 1320 tensioner is a ripoff of Kazinspeed, and never reuse an auto tensioner.


edit* If you had a KS tensioner, I actually have a photo of the proper height of the tensioner.

Last edited by wing8806; 02-13-2017 at 11:45 PM.
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Old 02-13-2017, 11:52 PM
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Re: Timing belt walk (yes another thread...)

Thank you. I put the new tensioner pulley on it and it helped. I'll post more results when we get more done.
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Old 02-14-2017, 02:25 AM
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Re: Timing belt walk (yes another thread...)

It's now walking to the edge of all the pulleys but not coming off.
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Old 02-16-2017, 01:37 PM
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Re: Timing belt walk (yes another thread...)

Finally was able to start the motor last night and run it for about 5 minutes the timing belt is roughly 1 - 2 millimeters off the camshaft pulleys and stays right at the edge of the tensioner pulley with about a credit card width from the balance shaft tensioner pulley. With the lower timing belt cover off watching it run rev the engine to about 3,000 the timing belt does not walk one way or the other at all. Can anyone else confirm that this is okay to run?

I have started this thread more or less to give other guys in the future guidelines and something to go off of with this common issue. As I've said before I have found many threads on different forms including this one with the same issue but no one seemed to post their fix or how everything ran after getting it done. I plan to post in the future to keep this updated as I put miles on the car.
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Old 03-09-2017, 12:07 AM
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Re: Timing belt walk (yes another thread...)

200 miles on the car and no issues.
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Old 03-10-2017, 01:59 PM
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Re: Timing belt walk (yes another thread...)

I ran into this same issue when I was running the manual tensioner. I had the belt too tight, while it wouldn't walk off of the cam gears, it would get to were it was hanging off about 1-2 mm like you say... However I replaced the manual tensioner with the revised auto tensioner and the problem went away. long story short I had the belt too tight with the manual tensioner. Even at the lowest setting the manual tensioner seemed excessively tight for some reason. The auto tensioner sorts out the tension for you and it definitely keeps it less tight then the manual did at full loose(ness) lol. But it has been running fine for over 20k.
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