Tensioner Pulley

[Atari_Prime]

I ordered a tensioner pulley for my ZR-1. A 94'. But the part received doesn't seem to match the part on the car. The pulley received is Dayco part #89001. According to the information I was able to find, that's the correct part number. This pulley does have ridges like the existing pulley but it is about half to an inch to an inch wider in circumference than existing pulley. What am I missing here?

[Mikey]

I have found tensioner pulleys for older cars to be a bit all over the map. Part numbers read "correct" but do not match up. On an LS2 in a C2 I built just 15 years ago I recently had to replace the tensioner pulley due to bearing failure. Ordered the "correct" one and it was way wrong. In the end after searching online and comparing pictures and dimensions I narrowed it down to 4 and ordered them all from my FLAPS who let me return whatever I did not need.

[HAWAIIZR-1]

Originally Posted by Atari_Prime

I ordered a tensioner pulley for my ZR-1. A 94'. But the part received doesn't seem to match the part on the car. The pulley received is Dayco part #89001. According to the information I was able to find, that's the correct part number. This pulley does have ridges like the existing pulley but it is about half to an inch to an inch wider in circumference than existing pulley. What am I missing here?

Where did you get your part from that said Dayco 89001 is for our cars? According to Rockauto you should have Dayco 89003. Check out the different specs (diameter and width) between the two and measure the one that came off your car.

Image1631245895.744186.jpgImage1631245902.839896.jpg

What made you replace the pulley? Is your tensioner okay?


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[Atari_Prime]

Originally Posted by HAWAIIZR-1

What made you replace the pulley? Is your tensioner okay?


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It wobbles and it shouldn't.

[HAWAIIZR-1]

Originally Posted by Atari_Prime

It wobbles and it shouldn't.

Okay, thanks. I was just curious.


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[Atari_Prime]

Originally Posted by HAWAIIZR-1

Okay, thanks. I was just curious.


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While changing out the serpentine belt recently me and my mechanic noticed that it didn't spin smoothly. It was kind of like a car wheel only being held on by a couple of lug nuts. You can actually kind of here it rattle a little bit with the new serpentine belt installed. Not sure how it goes bad with low miles on the car but I saw a few others post they have had them go bad too.

[HAWAIIZR-1]

Originally Posted by Atari_Prime

While changing out the serpentine belt recently me and my mechanic noticed that it didn't spin smoothly. It was kind of like a car wheel only being held on by a couple of lug nuts. You can actually kind of here it rattle a little bit with the new serpentine belt installed. Not sure how it goes bad with low miles on the car but I saw a few others post they have had them go bad too.

Thanks for taking time to explain. The only problem I have ever encountered belt tensioner pulley wise is all the while plastic guts (tape) was coming out of the tensioner. I just replaced it with a new tensioner, but I plan to rebuild it one day with the guts from the more common available units. At the same time I replaced the pulley with the billet unit, but since then have seen some issues with that one so I?ll eventually replace my pulley too.


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[Atari_Prime]

I can't get the images above to increase in size, but all the ones I found on Rock Auto had the smooth top design , no ridges to keep the belt in place (update just noticed that the Dayco on Rock Auto says smooth with flange). I then looked at Jerry's Gaskets. He has one that is theoretically the OEM Dayco design. When you put in the sku listed for the part on Jerry's site, it comes up as Dayco model 89001.

I can take a picture of what I received. I don't think I can pull the one off the engine though without a headache.

At least apperance wise, the one I received looks a lot like the image below. Would anyone be willing to take the circumferance of their pulley for comparison?

The simple thing for me to do would be to order the one from Jerry's and send mine back but right now I'm not sure if they would be any different.

[HAWAIIZR-1]

Originally Posted by Atari_Prime

I can't get the images above to increase in size, but all the ones I found on Rock Auto had the smooth top design , no ridges to keep the belt in place (update just noticed that the Dayco on Rock Auto says smooth with flange). I then looked at Jerry's Gaskets. He has one that is theoretically the OEM Dayco design. When you put in the sku listed for the part on Jerry's site, it comes up as Dayco model 89001.

I can take a picture of what I received. I don't think I can pull the one off the engine though without a headache.

At least apperance wise, the one I received looks a lot like the image below. Would anyone be willing to take the circumferance of their pulley for comparison?

The simple thing for me to do would be to order the one from Jerry's and send mine back but right now I'm not sure if they would be any different.

Got it. Sorry, I wish I could help you out but I?m not with my car or parts until I move back to Japan. I know I have two NOS tensioners with pulley but cannot recall if they have flange or not. It should be easy enough to measure the pulley on the car. As you said you can?t go wrong if you order from Jerry. For example here is the photo from Butler Chevrolet despite an old listing with no flange if the photo is correct. Unfortunately they don?t have a part number listed to cross-reference.

https://www.ebay.com/itm/90-91-92-93...-127632-2357-0


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[TX '90 ZR1]

Just order one from Jerry. He knows which pulley will be correct.
An added bonus is that he is a Registry member and deserves our support for helping keep our Z's on the road.
(By the way 2022 membership is now available so you need to get in!)