P80 (-1998 , 1999-2000) Serpentine belt path route diagram picture

[abscate]

image.jpg (182.08 KiB) Viewed 3833 times

[erikv11]

Go to IPD's pages when you can't recall how to route the serp belt.

IPD serp belt P80 https://www.ipdusa.com/products/8483/115286-auxiliary-serpentine-drive-belt-for-models-without-air-conditioning-850-s70-v70-c70

fullsize_6592.jpg (66.8 KiB) Viewed 3814 times

[abscate]

Do you see the problem with the 1999- short belt routing? The alternator reverses direction of rotation so that a free wheeling pulley will no longer make juice. You could get home during daylight from an hour or two and a good battery

The Zexel AC compressor also mounts differently than pictured. 4 Long M10 x 150? Bolts run front to back into four mounts on engine vs the transverse bolts pictured above

[scot850]

I am not seeing what you are. The belt is turning the alternator in the same direction in both pictures. There is just less contact surface on the alternator pulley, which is why Volvo changed the belt routing at one point.

Neil.

[bmdubya1198]

I am not seeing what you are. The belt is turning the alternator in the same direction in both pictures. There is just less contact surface on the alternator pulley, which is why Volvo changed the belt routing at one point.

Neil.

That is the -'98 short belt routing in Erik's picture. The '99+ uses a different belt and routing.

[scot850]

I am looking at the top picture that abscate shows as a 99- routing. It would work the same as that for the 98, or is the picture wrong?

Neil.

[abscate]

We don’t have a picture of the 1999 with a short belt but if you look at the right hand picture of First post a short belt runs from bottom of crank pulley to to bottom of alternator , which reverses its spin

[1998v70xcbill]

I'm no expert, bu I googled it and found
"An alternator will charge spinning backward. ... Since the fans are centrifugal, they work, but less efficiently in the backward direction" . The brushes should be ok going backwards too. Might be ok short term.

[abscate]

Electrically you are fine but if you have a freewheeling pulley the alternator won’t charge. It’s a mechanical issue.

The other issue is the rotation is now unscrewing the pulley from the hub, which can get interesting.

[bmdubya1198]

I'm no expert, bu I googled it and found
"An alternator will charge spinning backward. ... Since the fans are centrifugal, they work, but less efficiently in the backward direction" . The brushes should be ok going backwards too. Might be ok short term.

Well, the obvious way to check this theory would be to test battery voltage at idle. If it's charging, I see no reason to worry about it other than the fan not working as efficiently as possible.