I’m almost finished with the Serpentine Belt mod for my 93. This is the one that gets rid of the double sided belt, and installs the single.

Now my problem. I’m trying to install a DAYCO 5060670 belt and it appears it is too tight. I need probably another inch or two. Even with the Idler pulley removed, I still don’t have the need length. So what brand and length of belt did you guys use??? Yes, my belts are on the Crankshaft correctly. Everything appears normal, except the lenght.
Ideas???

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1992-1993: Service Bulletin: Noisy/Fraying Accessory Drive Belt
Subject: NOISY/FRAYING ACCESSORY DRIVE BELT (INST. SINGLE-SIDED BELT)
Model and Year: 1992-93 CORVETTE WITH 5.7L (LT1) ENGINE
Source: Chevrolet Service Bulletin
Bulletin Number: 93-273-6A

THIS BULLETIN IS BEING RE-PUBLISHED TO ADD THE LABOR TIME FOR LABOR OPERATION NUMBER E7310.

VEHICLES AFFECT HAVE TILT STEERING COLUMNS (ROUNDS STYLE) WITH THE EXCEPTION OF THE "W" SERIES (SQUARE STYLE).

CONDITION:

Some owners of 1992 and early 1993 model year Corvettes with 5.7L (LT1, VIN P) engines using the double-sided accessory drive belt may experience a noisy or fraying belt condition.

Cause:

Inherent stresses and/or processing of the double-sided belt.

CORRECTION:

To correct this condition a change was made from the double-sided belt system to a new single-sided belt system. Starting the week of March 22,1993, VIN breakpoint #1G1YY23P4P5113150 Corvettes with LT1 engines were built with the new single-sided belt. To repair older units with the double-sided belt to a single-sided belt, the following parts must be installed:

NEW PART NO. DESCRIPTION
----------- -----------
10230259 Belt
10227507 Tensioner
10227069 P/S Pulley
10105355 Idler Pulley

 

A decent parts counter guy should be able to set you up with a belt that is a touch longer than your current Dayco if no one replies.
Any chance you could share your conversion parts list with another early 93 owner?
Did you use the list from the Service Bulletin? Thanks.

 

Belts stretch the most during the first few minutes of usage.
My guess is the belt is correct, but needs some coaxing to get it on.

I just did this conversion on my '92 a couple of weeks ago and I remember having to put the belt on before putting on the upper radiator hose.
Without the upper radiator hose, the serpentine belt tool can move farther and get enough movement to get the belt in position.
With the upper radiator hose in place, I wouldn't have been able to get the belt on.
Even then, there were times that I thought I wouldn't be able to get it on.

After the belt stretches, it won't be near as difficult.

There are marks on the tensioner assembly that indicate the correct belt length.


Tom Piper

 

I want to do this soon

 

Is the Dayco belt number the correct one for a late 93? I have found that some Dayco belts are designed to fit a number of cars as the tesnioner has enough trave to allow for some variance in belt circumfrence.

Try a belt for a 94 and see if that works. Chances are it's the same number, but the Dayco catalog should have a cross-reference table to show belt sizes by part number.

You could always pay the price and use the GM belt listed in the TSB.

 

Here is a follow up on my belt problem. Again, My 93 was a early model that had a double sided belt. GM had a Service change that converted it to a single sided belt (see above).
Ok, this is what I have found since....
1. GM has plenty of double sided belts (24 in Denver alone). GM part number 10186198. Had I known this I probably wouldn't have changed mine. But then again, I already purchased the parts.
2. The Dayco belt I purchase pn 5060670 (67 inch long) appear too small. So I went and purchase a Dayco 5060675 (67 1/2 inch long). The 5060675 was way too loose. So I had to make the 5060670 work. After working hours trying to get the tensioner positioner into place, I quit with that. I found that if you bolt the tensioner into place and using a small flat piece of strong metal (mine was a Autozone Tension pulley loaner kit), you pry the belt around the power steering pulley. The belt easily streched. I sure wish I knew this before spending 5 hours screwing with the tensioner pulley.
Here is a picture...

 

Tough lesson in tensioners. I recently replaced my belt with the one from GM since I couldn't find the double sided one anywhere else. I think it was about $60. My old belt showed no signs of fraying, just severe cracking. I expect the pulleys for converson cost you a lot more but at least now you can use an inexpensive belt available everywhere. I believe I will pick up a spare belt from GM while they are still available rather than do the conversion, that should cover me for some time down the road.

 

The conversion cost:
Tensioner: $32.00 (Advanced Auto Parts)
Idler Pulley: $11.00 (Advanced Auto Parts)
Power Steering Pulley: $43.65 (GM)
Belt: $26.40 (Advanced Auto Parts) Price match against Goodyears
Total: $113.40 - $56.95 (Original Double sided belt 10186198) = $56.10 cost savings.

 

Now I'm sure of it! Sorry you had to learn the expensive way.

 

Fill me in. I'm trying to figure out what this mod does. Free up some power? Makes replacing belts easier?

 

The double sided belt wears out quickly. GM had a mod to convert it over to a single sided belt (See my 1st post). The single sided belt is found everywhere (AutoZone, Napa..etc), but the double sided belt is only found at the dealer.

If I had know the belt was only $56.00 at the dealer, I would have just purchased one. I thought no one had them.

Don't worry about the mod for you, its only for 92 and 93 with double sided grooves in the serpentine belt.

 

Damn it, I pulling my hair out for the last 3 hours trying to figure out how to get the new belt on my 96, guess I now have my answer. Off to Autozone tomorrow!

 

I loosen the alternator bolt by the throttle body, as it gives just a scosh of extra room, then once the belt is on, I pull up the alternator and voila, it is on. Then again, I think you can get a 67.3 inch belt from DAYCO?