Moses Ludel’s 4WD Mechanix Magazine – How-to: Jeep 4.0L Water Pump and Serpentine Belt

How-to: Jeep 4.0L/4.2L Inline Six Water Pump, Serpentine Belt and Radiator R&R!

In this HD video how-to, Moses Ludel removes and installs a water pump in a 1987-2001 Jeep XJ Cherokee 4.0L engine.  The basic steps in this water pump replacement carry over to other 4.0L Jeep inline sixes, including the 1991-95 YJ Wranglers and the 1997-2006 Jeep TJ Wranglers.  Jeep Grand Cherokee ZJ/WJ models also use this engine from 1992-2004. (Many steps apply to Jeep CJ models equipped with the 232 and 4.2L/258 cubic inch inline six cylinder engines.)  Included is how-to on removal and installation of the serpentine drive belt.

Jeep inline 4.2L and 4.0L six-cylinder water pump and serpentine drive belt
Water pump and serpentine belt on Jeep 4.0L inline sixes

The video includes the step-by-step Part 1 (removal) and Part 2 (installation) plus bonus footage covering radiator design, technology and aftermarket radiator upgrades.


Viewer comments:Thanks so much.You saved me $360. I’m not mechanical at all, but I’d watch about a minute of the video, then run out to the driveway and work on the Jeep, come back in and watch another minute, run back to the driveway. Wasn’t that hard at all with the video!”—Paul M.

Water pump and serpentine belt replacement for Jeep 4.0L inline six

Replacing both the water pump and serpentine drive belt assure reliability on the trail and in hot summer traffic with the air conditioner running. With the radiator removed, these components are readily accessible. The pump can be changed with the radiator in place, although space is crowded. If you do remove the radiator, have it cleaned and pressure tested by a professional radiator shop.     If you do want to simplify a water pump installation, consider removing the radiator first.Once out, the radiator can be sublet to a local radiator shop for “boiling out” and pressure testing, your assurance that the Jeep XJ Cherokee will be reliable. These cooling systems tend to be marginal in stock design. Keeping the radiator at peak efficiency, or changing to a more efficient design, can enhance the cooling.