The universe delivered to me a free new-ish water pump for a S3 XJ6 from Rock Auto, in very nice condition.
Now, I have:
A S2 XJ6 engine and car that need a water pump.
The original S2 water pump with a crusty bearing
A water pump from a federal S2 (with the fitting for the carburetors cooling), with an almost acceptable bearing.
The newish S3 pump.
I am not really into keeping things 100% original and looking at the options from this point forward.
It seems that the most reasonable thing to do is to use the new-ish S3 pump. This comes with 3 actions needed:
1- Plug the conduit to the throttle body. Done. I simply replaced the connector with the plug from the original pump.
2- Figure out a solution to mate the smaller bypass connector to the larger hose at the top. I am thinking putting a rubber sleeve to increase the diameter. Or may be I can find a bigger connector, or fit a S3 hose. TBD.
3- Figure out the fan/clutch and fan: the S3 pump pulley has 4 bolts sticking out, I suppose for a fan clutch, while the S2 fan clutch has a big bolt in the middle. Any suggestion on the best way forward?
Fit S3 clutch and fan? What minefield would this lead me into re the fan shroud, radiator etc…
Swap the pulleys (I read that pulling them out and pressing them in is not a fun job without heavy duty tools…).
Top: The S3 pump
Middle: Federal one with connector for the carbs
Bottom: Original with crusty bearing
The S1 has a four bolt clutch. The single bolt version has been used on some S3s too I think. I can measure the bolt hole distance of my S1 clutch when I‘m with the S1 again. You can make out the bolts on the pulley…
When looking into this a while ago I found that there are no changes in fan shroud parts from S1 - 3.
I wanted a “short-nose” pump to allow more space for electric fan installation. I ended up buying a Series S3 pump, and I’ll be using the rubber sleeve method that you’re considering.
My S3 pump came with the clutch mounting studs loose, so you probably have the option of removing the studs from yours if you go electric. The bolt centres (clutch flange to pulley) seem to be the same for S1 and S3, so I think you can consider a Series1 fan and clutch or a Series 3 fan and clutch for your S3 pump.