I am about to replace my A/C Compressor and will be replacing the drive belt at that time for the first time in my ownership. The JCW has an 11.3% reduction pulley and calls for a 6PK 1374 belt.

I want to put in a Goodyear Gatorback belt and there are two lengths I can go with as they don't have one that matches the factory 1374mm length.

Gatorback 4060537=53.74"/1365mm
Gatorback 4060539=54"/1371.6mm

I know most on here use the 4060537 for the bigger aftermarket reduction pulleys. Would the 4060537 be to short and put to much tightness on the tensioner and pulleys? I thought if it would not be too short it would give me some extra length and belt life as the belt stretches over time gradually getting to 1374mm.

Is any one using this shorter belt on their JCW or should I use the 4060539 to more closely match the factory size belt? I would appreciate learning from others experience here.

Thanks for any input.

Jim

 

My guess would be the belt closer to the correct size, Gatorback 4060539, if not the specific size required.

Perhaps there is a cross reference guide for the belts which would help.
The following part numbers are from Real OEM:

Stock pulley= 11287520199
JCW pulley= 11287545120

Hope this helps...

 

Any others with experience to share?

Thanks

 

4060539 will work. a 3mm belt length difference on the tight side will not hurt you at all. never go longer, only a hair shorter.

 

Would 9mm shorter be a hair too much shorter and to tight on the tensioner, drive, and accessory pulleys then?

 

The 537 can be tough to get on with a 15% reduction pulley so I wouldn't want to try it with a larger diameter SC pulley. As has been stated 539 is a closer fit to what you need if you want the Goodyear belt.

 

Thanks! I was hoping to hear from real application experience of the shorter belt.

 

wish you were able to get it worked out!

 

I have a 16% pulley with stock crank pulley. I have a 06537 and am praying it will work once the current belt wears. Since its is slightly smaller than a 15% maybe i'm in the clear... thoughts?