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 Write-Up: Replacing Supercharger Belt Tensioner

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1998 Riv
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Tue Aug 26, 2008 1:46 pm

38351 is a Gates part #. If you type it in the search, it brings up both the Gates 38351 @ 65.79, and the AC Delco under 38351 but with the ACD part # in the description @ $74.79. If you type in the GM part # it only brings up the 38351 under AC Delco. I wonder if they are really different mfgrs? I'd think the AC Delco would fall under it's own part # instead of Gates' #.
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AA
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Tue Aug 26, 2008 1:49 pm

I.m thinking one uses different materials than the other. There has to be a difference. They wouldn't sell the same part at 2 different prices, I hope.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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1998 Riv
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Name : Dave
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Tue Aug 26, 2008 1:54 pm

I did some part # interchange searching, and it looks like a few mfgrs use the 38351 part # to identify this tensioner. Gates and ACD call them DriveAlign auto belt tensioners. I think they are identical.
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1998 Riv
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Tue Aug 26, 2008 1:59 pm

Don't know when an answer might come, but I emailed RockAuto and asked about these 2 options.
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AA
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Tue Aug 26, 2008 2:10 pm

Thanks for the help, Dave. I'll stand by in case they shed some light on things.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
1998 Riv
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Name : Dave
Age : 56
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Joined : 2007-01-17
Post Count : 4490
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Tue Aug 26, 2008 5:57 pm

No reply yet.
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1998 Riv
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Wed Aug 27, 2008 9:13 am

Replied overnight. Pulleys are the same, plastic ribbed, and steel smooth. But DUH, that info is already stated online. I replied and asked about the tensioners themselves. Will let you know what they say. I'm sure the Gates is fine, but for $9 I'd just go with ACD.
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1998 Riv
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Wed Aug 27, 2008 9:28 am

Ok, they replied already. But they don't really answer the question. I'm assuming they don't have physical access to the parts to check it out.
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1998 Riv
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Wed Aug 27, 2008 10:25 am

... as I suspected. No parts there to compare. Either choice is probably going to be fine. Buy both and you can compare them for us. smile
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ewolfe0050
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Wed Aug 27, 2008 8:54 pm

I have a new one in the shop I can take a photo of but it won't be until Saturday
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1998 Riv
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Wed Aug 27, 2008 10:53 pm

New, but from who? Gates? AC Delco? Dayco? NAPA?
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AA
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 8:54 am

Thanks for the diggin, Dave. Eric, what's your price?

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
ewolfe0050
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 9:47 am

I bought mine from NAPA approx $99.00. It came with a metal pulley. I don't think it looks like the one pictured earlier in this thread but I might be wrong.
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1998 Riv
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 9:51 am

The one I posted earlier was incorrectly spec'd by Dayco and RockAuto. Dayco doesn't offer one for the Riv, it turns out.

Your NAPA piece has a steel smooth, and plastic ribbed pulleys, right?
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ewolfe0050
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 9:54 am

I am pretty sure it just has one steel smooth pulley.
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1998 Riv
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 11:06 am

Really? Gates and AC Delco units have the ribbed pulley included.
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1998 Riv
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 11:08 am

http://198.208.187.182/internet/PartImage.jsp?mfgname=&prodlinecd=&acpartnbr=38351
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1998 Riv
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 11:12 am

Sounds to me like they may have sold you the tensioner unit by itself, instead of the complete assembly. That's what RockAuto tried to give me as a repl for the Riv, until we found out it was not the correct app(see pic on pg 1) and the tensioner could only be purchased as a whole assembly. I could not figure out a way to remove the tensioner only, from the complete assy, on my car. Because you can't replace it.
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ewolfe0050
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 11:21 am

The one in the link is the one I have. I know the smooth pulley is metal and I will have to check on the ribbed. It's been a while since I have had it out of the box.
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 11:23 am

Ok, you should be good to go then
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AA
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 2:50 pm

Selling price, Eric?

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
ewolfe0050
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Thu Aug 28, 2008 3:24 pm

It's not for sale... sorry. I bought it to put on my car but haven't gotten around to it yet.
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BoattailBob
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PostSubject: Tensioner pulley bolt   Tue Oct 14, 2008 3:21 pm

I cannot get the bolt (rev thread) off my s/c tensioner pulley. The bolt is stripped and wont accept a torx bit. Im about to drill it out but need to get another bolt like this. Can anyone help me out? Have one lying around? GM will try to sell me the entire assembly. Im not sure how else to get that bolt out. Advice appreciated.
It's the bolt that goes here:
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AA
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PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Tue Oct 14, 2008 3:43 pm

I believe that bolt is reversed thread.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
Back to top Go down
http://www.cardomain.com/ride/657082/4
1998 Riv
Aficionado


Name : Dave
Age : 56
Location : In The AZ Oven
Joined : 2007-01-17
Post Count : 4490
Merit : 43

PostSubject: Re: Write-Up: Replacing Supercharger Belt Tensioner   Tue Oct 14, 2008 4:15 pm

That's what his post says. smile

Maybe you could try heating it a bit then try again?
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