Belt Tensioner Pulley

[KPW]

Old tensioner pulley rattles, tells me that the bearing is on its way out. Bought the L98 Dayco unit to rebuild my LT5 unit.

I noticed that the pulleys (old and new) are really tight fit to the Dayco post, but have a tiny bit of play on the LT5. Otherwise, things seem to be the same. Any thoughts on how I can fill the gap?

[Paul Workman]

Old tensioner pulley rattles, tells me that the bearing is on its way out. Bought the L98 Dayco unit to rebuild my LT5 unit.

I noticed that the pulleys (old and new) are really tight fit to the Dayco post, but have a tiny bit of play on the LT5. Otherwise, things seem to be the same. Any thoughts on how I can fill the gap?

Whatever works, i guess. I believe Jerry's Gaskets carries the right pullies. If not, I am using one for an LT1 motor on the Z. Been good for 6 years now.

[Dynomite]

Belt Tensioner Pulley (http://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-12.html#post1590759181)

I just put over 2,000 miles on this billet aluminum pulley with no issues.


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[Locobob]

I'm thinking about tensioners as well. My car got a little hot yesterday and I also noticed it wasn't charging very well. Poking around a little I noticed the belt seemed to have more slack in it than I feel like it should. The belt appears to be in good condition. Kinda thinking maybe the tensioner spring is not doing its job very well.

[KPW]

Rebuilt my Tensioner per issue 34 of HOB. Took care of the rattle noise, but I'm experiencing the same issue as Locobob.

On that topic, I found this:
http://www.zr1.net/forum/showthread.php?p=241294

Possible that a new (shorter) belt could stiffen things up. :)

[Locobob]

I discovered that I can actually move the tensioner quite a bit just by putting finger pressure on the belt up by the power steering pump, I don't think it should be that easy to move.

[Dynomite]

I discovered that I can actually move the tensioner quite a bit just by putting finger pressure on the belt up by the power steering pump, I don't think it should be that easy to move.

To move the Tensioner which I just tested 4 of them......on average starts at about 17 lbs and goes to almost 30 lbs fully compressed. I had one start at 25 lbs and goes to 40 lbs. This force pulling from center of Tensioner pulley perpendicular to tensioner arm.

The Force measured would be the actual force on the Belt Tensioner Pulley perpendicular to belt between Alternator Pulley and Harmonic Balancer.

[Locobob]

Here is how much I'm moving it with just one finger pressing on the belt.

http://i418.photobucket.com/albums/pp270/locobob68/th_IMG_3275.mp4 (http://i418.photobucket.com/albums/pp270/locobob68/IMG_3275.mp4)

[Dynomite]

Here is how much I'm moving it with just one finger pressing on the belt.

http://i418.photobucket.com/albums/pp270/locobob68/th_IMG_3275.mp4 (http://i418.photobucket.com/albums/pp270/locobob68/IMG_3275.mp4)

You have very strong finger :D

I have no idea where you were pressing but am assuming you are pressing perpendicular to belt between two of the pulleys. I would say that is a very weak Belt Tensioner. I will go out now and press on my belt for ya :p

OK....I pressed down with finger between Power Steering Pulley and AC Compressor and could not push hard enough to move Belt Tensioner pulley hardly at all. I then pushed down with my thumb pretty hard (maybe 10 pounds) on the belt and the Belt Tensioner Pulley moved almost as much as your video. If that helps you ;)

Also......your Serpentine Belt is maybe a bit long (by 1/4 inch) making the belt tensioner stroke almost maximum with minimum pressure at maximum stroke. Just judging from the small space between the Belt section passing the Tensioner and the belt section going from the Alternator to the Water Pump.

[Locobob]

Yeah its rattling like a mofo too, the tensioner is definitely bad. What are you getting out of that fancy pulley Cliff? Is it just bling?

[Dynomite]

Ya.......some bling, an easily replaceble pulley bearing, Just a tad larger diameter pulley, and the pulley is not plastic :D


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[Locobob]

Ya.......some bling, an easily replaceble pulley bearing, Just a tad larger diameter pulley, and the pulley is not plastic :D


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Is the bearing in the plastic one not easily replaceable? Does the metal one come with a bearing? Do you think the metal pulley offers an advantage over the plastic one in some way? I've got an L98 tensioner on order to gut for parts so I have a few days to consider options.

[Dynomite]

Billet aluminum pulley has a nice bearing that is held in place by a c-clip. I do not see a c-clip on stock bearing. No particular advantage other than that and both Aluminum and plastic will prolly last equally ;)

If you install an aluminum pulley with c-clip which c-clip is installed against boss on tensioner.......you have to touch up boss with file so c-clip does not touch boss as pulley rotates.

I am assuming spring on L98 tensioner is same? I did have one tensioner on shelf with stronger spring starting out at 25 lbs vice 17 lbs (1 out of 4).

You can measure tensioner torque using fish scale or bow pull (archery) from any outdoor store.


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[HAWAIIZR-1]

Hey folks, Rather than start a new topic I figured to chime into this one. No tension or noise issues, but when I had my car on the lift I saw that white tape coming out from the tensioner. I read you can stuff it back in, but being paranoid I'm a replace person. This 95 has only 31K miles so I'm surprised.

https://uploads.tapatalk-cdn.com/20170529/d0ce4694cf02010647476c726bd71986.jpg

I had a new tensioner on the shelf and I figured
go for some bling with the Dynomite pulley while I'm at it. Thanks Cliff for the offline consultation. I owe you several beers now. All went well and easy R/R and just a little bit of muscle to get the belt over the alternator pulley. I used the Goodyear Gatorback 4060805. The stock belt (GM 10067477) was fighting me so I cut that biatch off.

https://uploads.tapatalk-cdn.com/20170529/aa471aaed6c7e9b1cd2b367d8d473cd8.jpg




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[Roadster]

Nice job Craig, a good thing you happen to catch that now rather than later.
I know it is not, but it appears to me that it looks like a Mike & Ike piece of candy sitting in the belt area on the RS top of the pic...shows you where my head is, always thinking about food one way or another....:D

[Dynomite]

Time for the Billet Aluminum Alternator Pulley :)

http://i287.photobucket.com/albums/ll142/dynomite007/Dynomite19/d8a219b2-f604-4653-9c28-360157f1027b.jpg

All Aluminum Alternator Pulley (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-13.html#post1592505495)

[HAWAIIZR-1]

Nice job Craig, a good thing you happen to catch that now rather than later.

I know it is not, but it appears to me that it looks like a Mike & Ike piece of candy sitting in the belt area on the RS top of the pic...shows you where my head is, always thinking about food one way or another....:D


Thanks Tom! You're too funny. That is actually a red cap that is on the end of the hose clamp for the air duct. It won't taste as good as Mike & Ike and a bit more chewy.....lol.


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[HAWAIIZR-1]

Time for the Billet Aluminum Alternator Pulley :)



http://i287.photobucket.com/albums/ll142/dynomite007/Dynomite19/d8a219b2-f604-4653-9c28-360157f1027b.jpg



All Aluminum Alternator Pulley (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-13.html#post1592505495)


You're a troublemaker aren't you....lol? I eventually might put on the SRP underdrive pulleys from the 90.


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