kwhitez28

Needing to replace the WP on a 1994 jeep grand cherokee i6 4.0. Cant find any instructions online on how to do it, dont want to buy the book. Anyone know where I can find detailed instructions on how to replace the WP?

N20jeep

1. Disconnect negative battery cable at battery.
2. Drain the cooling system. Refer to Cooling System Draining .
3. Loosen (but do not remove at this time) the four fan hub-to-water pump pulley mounting nuts. NOTE: The engine accessory drive belt must be removed prior to removing the fan.
4. Remove engine drive belt as follows:

Fig. 4 P.S. Pump Rear Mounting Bolts - 4.0L Engine

• Loosen two rear power steering pump mounting bolts A.

Fig. 5 P.S. Pump Front Mounting Bolt/Locknut - 4.0L Engine
Fig. 6 Bracket Mounting Bolts - 4.0L Engine

• Loosen upper pump pivot bolt B and lower lock nut C.
• Loosen pump adjusting bolt D until belt can be removed.
• Remove belt.

1. Check condition of all pulleys.
2. The power steering pump must be removed from its cast mounting bracket to gain access to bolt E. Bracket mounting bolt E is located behind the power steering pump.
3. Remove two bolts A.
4. Remove locknut C and belt adjustment bolt D.
5. Remove bolt B. Position power steering pump to the side. Hold pump in position with wire. Do not disconnect hydraulic lines from pump.
6. Remove bolts E, F and G and remove pump mounting bracket.
7. Remove idler pulley mounting bolt and remove idler pulley. This must be done to gain clearance for the water pump mounted heater hose fitting when water pump is being removed.

Fig. 7 Hose Clamp Tool - Typical
WARNING: Constant tension hose clamps are used on most cooling system hoses. When removing or installing, use only tools designed for servicing this type of clamp; such as special clamp tool (# 6094). Snap-on clamp tool (# HPC-20) may be used for larger clamps. Always wear safety glasses when servicing constant tension clamps .

Fig. 8 Clamp Number/Letter Location
CAUTION: A number or letter is stamped into the tongue of constant tension clamps. If replacement is necessary, use only an original equipment clamp with matching number or letter.

1. Remove lower radiator hose from water pump. Remove heater hose from water pump fitting.
2. Remove the four fan hub-to-water pump pulley mounting nuts.

Fig. 9 Fan Shroud Mounting

1. Remove the two fan shroud-to-upper radiator crossmember attaching nuts.
2. Remove the fan assembly and fan shroud (together as one unit) from the vehicle.

Fig. 10 Water Pump Remove/Install - 4.0L 6-Cylinder Engine

1. Remove the four pump mounting bolts and remove pump from vehicle. Discard old gasket. Note that one of the four bolts is longer than the other bolts.
2. If pump is to be replaced, the heater hose fitting must be removed. Note position of fitting before removal.

N20jeep

let me know if you cant see the pics. ill upload them another way

kwhitez28

Thanks a lot for the information! Just what I needed. I tried to click on the link to drain the cooling system but it asked me for a login and password. Anyway I can get to click those links for more information?

N20jeep

for draining, just open the petcock valve on the bottom of the radiator.

i cant give you the password for it, but i can get you whatever other info you want

kwhitez28

thanks again! So im assuming to reinstall i just reverse the steps?

N20jeep

yep. water pumps on 4L's are pretty straight forward. just take your time if its your first time and the rest will seem easy.

kwhitez28

seems like it will go ok...any chance of having torque specs on the wp and power steering pump? Do you recommend using rtv to seal gasket?

N20jeep

i dont have the specs near me, but use a short 3/8 rachet to tighten it. you want it tight, but you dont want to crank down on it

as for the RTV, i recommend putting a thin coat on bot sides of the waterpump gasket and let it sit for about 10 minutes before you re install it..(this is after you clean off all the old gasket from the block ofcourse)

kwhitez28

Cool thanks for all the help!!!!

ol"blue

For the '94 4.0L, the water-pump bolts should be torqued to 22 ft. lbs.
It doesn't give a torque spec. for the power steering pump mounting bolts in the manual. It simply states to "tighten securely".
Hope that's helpful.
Dan

4jeepers

I think that the torque on the WP bolts are around 17 ft pounds. As for RTV don't use if the new gasket already has a sealant embedded in it!