I went to my local Bennett Auto Supply
store and got their help with the different Jeep waterpumps. They sell ASC Industries
brand waterpumps, and they allowed me to get all the fitment info & take pictures of the parts. I wanted to show the differences between the models & the standard and reverse rotation impellers.
Here is what I found.
These CJ style waterpumps are NOT interchangeable with YJ pumps.
= '83-'86 2.5L & '81-'86 4.2L Serpentine reverse rotation only
= '83-'86 2.5L & '80-'86 4.2L V-belt standard rotation only
Notice the water pipe for the heater core supply is cast into the housing.
This pipe casting will not clear the A/C & alternator bracket on YJ models using the same engine as the CJ models that these pumps fit.
The last pic in this group shows the pipe to bracket clearance on a YJ.
These are AMC YJ water pumps, and are NOT interchangeable with Daimler-Chrysler YJ waterpumps.
= '87-'90 2.5L & '87-'90 4.2L V-belt standard rotation only
= '87-'90 2.5L & '87-'90 4.2L Serpentine reverse rotation only
Notice that the pump has a threaded hole for the heater supply pipe to be threaded into the pump.
The waterpump on the right, part #WP-853 is a reverse rotation pump for Daimler-Chrysler YJs
= '91-'02 2.5L YJ & TJ models & '91-'99 4.0L YJ & TJ models
Notice the lower profile shaft.