No, but, I do recall a past lister’s documented postings on two methods to install the GM part. One self made and the other Johnscar sourced. Alex Carnarra is his namew.
Search rthe archives, it was on the old J-L do I hoe the material was moved here.
Thank you Carl. I have the John´s car instruction sheet; which I think is pretty straightforward, but I just wanted to have a “picture” in my head before I dove in.
Oh well. Everything came together fairly OK… with the BIG exception that I have a something between 2-3 centimeters misalignment between the alternator pulley and the other pulleys (jockey pulley - euro (uk) car with no air pump (1986 V12)).
I´m pretty sure I´ve done something wrong, but can´t think of what. Any ideas?
Here go some pics:
Here´s the original Jaguar bracket, the John´s car bracket and the jockey pulley bracket assembled:
And here is the end product. What you can see at the bottom, is the Alt pulley. The “yellowish” thing in the foreground is the jockey pulley. I believe the misalignment is clear:
Any ideas?
1 Like
Kirbert
(Author of the Book, former owner of an '83 XJ-S H.E.)
5
I believe you misunderstand what the John’s Cars adapter is supposed to do. As I understand it, it’s supposed to locate a GM alternator in the same place as the OEM Lucas alternator, which means it’s driven by a belt around the groove in the crank damper. The jockey pulley operates off the next belt forward, fitted to the rearmost groove on the pulley that’s bolted to the front of the crank damper.
If you intended to eliminate one belt, the John’s Cars adapter wasn’t the way to go. Some of us have done that by replacing the air pump with a GM alt. In a car without an air pump, that would mean replacing that jockey pulley itself with the GM alt.
I sent them an email before seeing your reply, and they confirmed me that the alt (in the Lucas original location) is now driven by a new belt directly from the crank.
As I understand it, I can do away with my jockey pulley anyway, as it´s only meaning in life was to drive the dead Lucas alternator.
I correct myself. No, I won´t be able to take away the jockey pulley, as it also drives the AC compressor.
Everything´s set. I´ll give it a try tomorrow!
Cheers.
Kirbert
(Author of the Book, former owner of an '83 XJ-S H.E.)
8
When I did mine, I tossed the air pump over the hedge and installed a GM alt
in its place, so that particular belt drove both the A/C compressor and the alt,
and the alt served as the belt tensioner.
That got me down to three belts. Tossing the belt-driven fan over the hedge
and installing electric fans got me down to two belts.
I can picture Kirby´s neighbour´s lawn full of Lucas parts…
Anyway, I started the car yesterday, as promised, and I have this large smile in my face I cannot get away.
The end result, is that I have a hefty 13,8 volts when running, at idle, with heating fans at high speed and all lights on. This is how it looks from inside the car:
And this is what it looks from the battery side:
And down there is the GM SI12 alternator, running away on the original Lucas alternator belt.
Considering everything, it´s not that hard. The most difficult part is figuring out how parts go together, but that´s me, and my clumsiness.
I believe the John´s car bracket is an extremely well designed product (no affiliation, just a customer).
For anybody who wants more information, more pics or just a chat or advice on my experience, feel free to chime in.