aircon idler pulley bearing replacement

Moderators: dhdove, davidr, BigCatXJS

Brakebuster
Posts: 3131
Joined: Tue Apr 18, 2006 1:17 pm
Location: Gloucester UK

aircon idler pulley bearing replacement

Postby Brakebuster » Tue Jan 27, 2015 10:10 am

we are quite lucky with our V12 XJS's , honest.......

as all the belts are separate for each device , and no ' serpentine belt ' there arnt any idle pullies to go bad , apart from one, this is the adjustment for the aircon pump , and in overseas markets has the air injection pump in its place
Image
897 by MyPix on Talk Photography

this bearing has become noisy due to the forces put on it over 26 years and 100k miles,
some people modify a V12 water pump bearing to fit, as its a similar size, bt not a lot of people know that the bearing is available new from Jaguar, but at the cost of £90 all in :?
here it is below next to my existing bearing holder
Image
910a by MyPix on Talk Photography

first you have to slacken off the belt adjustment to allow the arm to pivot, remove the belt, and then you need to remove the three bolts holding on the pulley to the armature , undo the top and bottom bolts and remove from the car

you then need to remove the retaining grub screw and nut from the side of the arm
and drive out the old bearing with the collet still on using a puller/pusher
below is a spare unit I pulled apart next to the one I want to refurbish
Image
918 by MyPix on Talk Photography

next is to take apart the one I want to refurbish , and clean it up , then drive in the new bearing as below using a suitably sized socket
Image
915 by MyPix on Talk Photography

until it looked like this
Image
916 by MyPix on Talk Photography
to be honest it went in a little to far , so I flipped it over and sent it back 2mm

then I had to push on the pulley collet ,

Image
917 by MyPix on Talk Photography

and then threw it all back into the car
Image
919 by MyPix on Talk Photography

one less noise to worry about

BB :mrgreen:
1989 5.3ltr V12 XJS Coupé FULLY RESTORED
2004 2.1V6 X-Type Saloon in platinum silver for the good wife
1994 3.2S XJ40 in Morocco Red with Doeskin interior

used to have
1999 4ltr Sovereign XJ8 in Seafrost

User avatar
poprivet
Posts: 1743
Joined: Mon Jan 16, 2006 3:20 pm
Location: Hampshire

Re: aircon idler pulley bearing replacement

Postby poprivet » Tue Jan 27, 2015 11:54 am

Good write up Vince. Much usefullness in there. :D
1988 3.6 XJ-S coupe
'Remember that the value of your investment can plummet as well as fall'

oldtimer
Posts: 1311
Joined: Thu Jan 19, 2012 3:19 pm

Re: aircon idler pulley bearing replacement

Postby oldtimer » Tue Jan 27, 2015 6:50 pm

Hi BB,
Excellent job, we spoke about this some months back and the cost frightened me off - a touch of the "tight git in Scunthorpe syndrome". So come on then, what did it set you back and where did you get it.

Oldtimer

oldtimer
Posts: 1311
Joined: Thu Jan 19, 2012 3:19 pm

Re: aircon idler pulley bearing replacement

Postby oldtimer » Tue Jan 27, 2015 6:56 pm

PS to above, did you have any problem pressing the pulley mounting flange on and off ?

Brakebuster
Posts: 3131
Joined: Tue Apr 18, 2006 1:17 pm
Location: Gloucester UK

Re: aircon idler pulley bearing replacement

Postby Brakebuster » Tue Jan 27, 2015 7:24 pm

lol

i paid full price , £90 from Jaguar

sometime you got to pay full whack..............

the pulley flange was ' driven out ' in the vice with a drift and 2lb lump hammer , and slid on very easily in the press , but gently gently when getting to the point it needs to be ,

and the old bearing was pushed through using a 2 jaw puller


one thing to bear in mind, my pulley uses metric threads, i think this was changed from imperial thread in the mid eighties , but don't know for sure, i would guess a series 3 xj or earlier using a V12 will be imperial threads for the pulley flange ?

so best to use the same bits you have if refurbishing, rather than an ' exchange ' basis if you see what i mean


BB :wink:
1989 5.3ltr V12 XJS Coupé FULLY RESTORED
2004 2.1V6 X-Type Saloon in platinum silver for the good wife
1994 3.2S XJ40 in Morocco Red with Doeskin interior

used to have
1999 4ltr Sovereign XJ8 in Seafrost


Who is online

Users browsing this forum: No registered users and 4 guests