9 posts / 0 new
Last post
p.mole1
Offline
Last seen: 3 hours 36 min ago
Joined: 02/05/2016
Fan belt

Does anyone know the correct length of the fan belt on a Rover K series car.

My car is a 95 vintage and uses the older ACR alternator, this is a bulking old thing. I have an Apollo tank so the hoses pass through the belt. My fan belt has started to squeal on start up but the alternator is perilously close to chassis rail.

SM25T
SM25T's picture
Online
Last seen: 4 min 54 sec ago
Joined: 17/04/2014
... or more correctly alternator belt. You may well find the part number on the belt. They may be different compared to other cars, depending on the radius of the alternator from pivot bolt to centre of pulley, and diameter of pulley fitted.
Wrightpayne
Wrightpayne's picture
Offline
Last seen: 21 min 21 sec ago
Joined: 17/04/2014

Is it a traditional belt or polyvee? If its the latter the part number is a combination of how many V's and overall length. If there is a code on your current one you can probably work out the next size down. If it is 10mm shorter then it should move the alternator 5mm.

JonT
JonT's picture
Offline
Last seen: 4 hours 2 min ago
Joined: 07/05/2019

When you find out, put a spare one one as well (ie with the oil pipes through) then cable tie out of the way. If the one fitted fails, at least you don't have to take the oil hoses off to replace.

 

Wrightpayne
Wrightpayne's picture
Offline
Last seen: 21 min 21 sec ago
Joined: 17/04/2014

Just checked and I have two polyvee belts (used) both with part no 100840 which is the Rover part number. I have the later alternator but its the pulley that determines whether the belt is different!

The Gates equivalent is 5PK738 - 5 ribs 738mm long.

Next size down is 5PK725 - 13mm shorter so should move alternator 6.5mm.

Belts are about 7 quid so no big deal if the smaller one doesnt work out.

Please check everything for yourself to ensure all the info is correct - dont take my word for it! (All learnt researching dry sump drive belts)

Ian

Wrightpayne
Wrightpayne's picture
Offline
Last seen: 21 min 21 sec ago
Joined: 17/04/2014

Jon T,

Thats a misconception - you only need to undo the vent hose and jubilee clips holding the apollo and the belt will go over.

Ian

JonT
JonT's picture
Offline
Last seen: 4 hours 2 min ago
Joined: 07/05/2019

Thanks Ian. I have to admit, I haven't looked that closely at mine as it was fitted by 7workshop and the tip passed on. Still, if I'm doing it roadside, the less that has to be disconnected the better. 

p.mole1
Offline
Last seen: 3 hours 36 min ago
Joined: 02/05/2016

Thanks, it's a poly v belt. I didn't realise the part no related to the length, doh! A 725 should do it. My alternator doesn't touch the chassis yet but it looks too close for comfort and by belt need a bit more tension.

p.mole1
Offline
Last seen: 3 hours 36 min ago
Joined: 02/05/2016

I had a 755 belt and I have replaced it with a 738 and now have much better clearance. It was a hell of a job to get the belt on due to the oil pipes, I can't get enough slack to enable me to fit the belt without extreme effort. When I fitted the Apollo I relieved the block to give a bit more clearance for the oil pipes. It seems due to the physical size of the ACR alternator. Also I am having to run a 4 rib belt as that is what is fitted to the alternator the crank pulley is 5 rib as I now have a 1.8 fitted. Are the later alternators physically smaller? My car is a 1995 vintage