My 1987 XJS has been in need of a new fan clutch. After some phoning around, I discovered that the stock one was not immediately available. I did some research on the net and found that there was another part that is a direct bolt on.

I ended up using the Four Seasons part #36956. It has a little longer shaft which puts the fan about 1/2" closer to the rad (not an issue as there is plenty of clearance and it probably helps it pull more air). This is a heavy duty clutch which also spins the fan slightly faster.

Hayden also has this clutch, part #2747.

I believe that this is a good upgrade for any V12 to help the "challenged" cooling system. It probably makes a little more noise and may hurt fuel mileage some, but it's worth it IMO to not overheat the engine.

 

Great info Thank you

 

I wasn't sure my fan clutch was good, and when I pulled it I found the fan was cracked and ready to explode apart. Since I had everything removed already I purchased an electric fan and mounted it inside the shroud. Now I can manually turn the fan on, or wait until the temp triggers it. My engine runs considerably cooler even on very hot days and climbing steep hills.

 

Napa Auto parts also carries the correct fan clutch for the XJS. Its about $60 and fits inside of the updated black fan.