V12 Alternator question

XJ
1

Hopefully someone can assist with this alternator question. I have a 1985 Jaguar Vanden Plas V12. I had to replace my alternator as it was no longer charging. I received a rebuilt one , and when switching over the pulley and fan I went to have lunch and when I came back I think I may have mixed up some parts. Stupid me, I also forgot to take a picture. What I’m
Confused about is specifically the order in which the parts go back onto the alternator shaft. I have two spacers (washers) ,each with a woodruff key notch, a fan, the pulley, a lock washer and a nut. The shaft has a woodruff key in it. I suspected only one washer/spacer went back onto the alternator and the other one came with the rebuilt unit, but couldnt remember or be sure. Anyhow, I put it back the shaft in this order (closet to alternator to end of shaft)

  1. Only one spacer
  2. Fan
  3. Pulley
  4. Lock washer
  5. Nut

When I installed the rebuilt one back on my car, I heard a sound from the alternator that suggests it’s bearings are bad. However, before I return it I want to make sure the order of parts on the alternator shaft are correct.

Hopefully someone can help or has an old alternator lagging around

2

Alternators in general have the same assembly regardless of the make, so it goes> front housing > spacer > fan > pulley > flat washer > lock washer > nut.
did you spin the alternator shaft before you refitted it to hear if it ran smooth & quiet-ish?..often when you replace an alternator it will start to whistle/whine as the new components are being activated…if it doesn’t spin by hand smoothly & it sounds like something is binding recheck assembly.

3

If the pulley locked to the axle; the only issue is whether the driven alt pulley is aligned with the drive pulley - misaligned, the belt may make noise…

That said; there are ‘rebuilds’ and there are rebuilds - not all are up to scratch…

Frank
xj6 85 Sov Europe (UK/NZ)