omega_rugal Posted June 1, 2018 Posted June 1, 2018 this is from a pdf about the 4.0 histoty and specs... "In 2000 a distributorless coil-on-plug ignition system was installed, intake and exhaust manifolds were revised, and a more efficient water pump was included." so, what`s the difference between this more efficient pump and the others? can it be used in the earlier block?
Jeep Driver Posted June 1, 2018 Posted June 1, 2018 Newer stock pumps have an impeller that looks just like the Flowcooler impeller.................IIRC.
HOrnbrod Posted June 1, 2018 Posted June 1, 2018 1 hour ago, omega_rugal said: so, what`s the difference between this more efficient pump and the others? can it be used in the earlier block? Looks like the 91-01 carried the same water pump p/n, but for the 90 and below Renix the p/n is different. What's the difference?
omega_rugal Posted June 1, 2018 Author Posted June 1, 2018 so a lil more agressive impeller counts as more efficient pump... whatever
75sv1 Posted June 1, 2018 Posted June 1, 2018 18 hours ago, HOrnbrod said: Looks like the 91-01 carried the same water pump p/n, but for the 90 and below Renix the p/n is different. What's the difference? It there an offset difference? I think there are two p/n for water pumps for each year. One is wider than the other, and takes a different pulley. I could be wrong. The 99-06 WJ 4.0L has a plastic impellor. It is a spiral vane as I remember. Also has an extra bolt hole.
HOrnbrod Posted June 1, 2018 Posted June 1, 2018 33 minutes ago, 75sv1 said: It there an offset difference? I think there are two p/n for water pumps for each year. One is wider than the other, and takes a different pulley. I could be wrong. The 99-06 WJ 4.0L has a plastic impellor. It is a spiral vane as I remember. Also has an extra bolt hole. I should have been more clear. 91-01 4.0 MJ/XJ's all carry p/n 4626215, with AB, AC, etc. suffixes added as the years go up. I was told by an old Mopar parts guy that as long as the basic p/n is the same, they will all fit the 91-01 4.0 XJ/MJ models. The AB, AC, etc. suffixes usually indicate a design change or mod, like an improved impeller. Also WJ's, ZJ's, YJ's etc. sometimes use different belt mounting configurations, so the offsets and even pump rotation may be different in some cases.
DirtyComanche Posted June 1, 2018 Posted June 1, 2018 21 hours ago, HOrnbrod said: Looks like the 91-01 carried the same water pump p/n, but for the 90 and below Renix the p/n is different. What's the difference? I'd like to know this too.
FrankTheDog Posted June 2, 2018 Posted June 2, 2018 93-98 ZJ pump is same as 91-98 Wrangler pump, it has a longer shaft so that the bearings can be farther apart to support the shaft because of the fan being mounted on it. I don’t know if the 99-04 WJ is the same as the 99-06 TJ.
DirtyComanche Posted June 2, 2018 Posted June 2, 2018 4 hours ago, FrankTheDog said: 93-98 ZJ pump is same as 91-98 Wrangler pump, it has a longer shaft so that the bearings can be farther apart to support the shaft because of the fan being mounted on it. I don’t know if the 99-04 WJ is the same as the 99-06 TJ. If you use that pump do you need the matching pulley then? I'd assume so at least... Will the belt offset be correct for an XJ/MJ 4.0 if you do use the pulley it comes with?
FrankTheDog Posted June 2, 2018 Posted June 2, 2018 You do need the YJ/ZJ/TJ pulley to use that pump. Belt position will be the same with the ZJ pulley as on an XJ. I don’t know how close the pulley/ fan mount will be to the radiator.
MeanLemons Posted June 3, 2018 Posted June 3, 2018 The ZJ/YJ/TJ pump has different bolt pattern also... it uses studs to hold the fan on it. The pulleys are designed differently. can't be mixed with a XJ/MJ pulley.
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