p.mole1 Posted June 10, 2020 Share Posted June 10, 2020 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. Link to comment Share on other sites More sharing options...
SM25T Posted June 10, 2020 Share Posted June 10, 2020 ... 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. Link to comment Share on other sites More sharing options...
Wrightpayne Posted June 10, 2020 Share Posted June 10, 2020 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. Link to comment Share on other sites More sharing options...
JonT Posted June 10, 2020 Share Posted June 10, 2020 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. Link to comment Share on other sites More sharing options...
Wrightpayne Posted June 10, 2020 Share Posted June 10, 2020 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 Link to comment Share on other sites More sharing options...
Wrightpayne Posted June 10, 2020 Share Posted June 10, 2020 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 Link to comment Share on other sites More sharing options...
JonT Posted June 10, 2020 Share Posted June 10, 2020 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. Link to comment Share on other sites More sharing options...
p.mole1 Posted June 11, 2020 Author Share Posted June 11, 2020 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. Link to comment Share on other sites More sharing options...
p.mole1 Posted June 27, 2020 Author Share Posted June 27, 2020 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 Link to comment Share on other sites More sharing options...
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