Spent some time playing with water pumps today, the water pump was leaking when we bought the CJ and I put a Patrol unit on it only to discover that the pulley spacing is different between the Jeep SD33 and the Nissan one. Rather than try and find the correct water pump I decided to investigate the differences and see if I could make the Patrol unit work.
The two water pumps side by side.
Nearly 150mm from the back of the pump to the mounting face on the Patrol unit
Around 133mm on the old unit
After some investigation it appears that the shaft lengths are actually very close and most of the difference in length is taken up by the pulleys
The pulleys removed from the pumps
The original pulley pressed onto the new pump
All fitted up and working fine now. The pulley is pressed down the shaft a little further on the new pump but that does not cause any issues with the pulley or fan mounting.
Now it looks like the alternator has packed it in as its noisy and not charging so some more work to go.......
Regards,
Tote