Water Pump Replacement 4.7L - JeepForum.com
 
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post #1 of 6 Old 11-22-2021, 09:46 AM Thread Starter
bfry
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Water Pump Replacement 4.7L

Water pump is leaking so bought a new pump and figured I’d replace the thermostat as well since I will be draining the system.

Question is, my car seems to have 2 fans? I think I got some heavy duty cooling option when I bought it… There’s a fan attached to the water pump with a massive bolt and then there’s a fan in front of that one right up on the radiator which I assume is the electric one.

To replace the water pump I’m gonna have to detach that first fan. Anyone familiar with the process to do so?

Every video I’m finding shows WJ’s without that back fan attached to the water pump.

Thanks.

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post #2 of 6 Old 11-22-2021, 09:56 AM Thread Starter
bfry
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Buddy said to use a fan clutch to get it off and when I googled it, the thread below came up - sounds like if I leave belts on though I can just use a large crescent wrench…

https://www.google.com/amp/s/www.jee...661/%3Famp%3D1
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post #3 of 6 Old 11-23-2021, 08:04 AM
Double E
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You see the WJ without the big fan because in 2002, they started using the Power Steering pump system to move the cooling fan. It recovered some horsepower but I'm not convinced it is a more reliable system.
Yes, a large fan clutch removal tool will break the nut free. Just be aware that it may be reverse thread. I forget if it is but someone will chime in if not ...or you can look it up.

You'll probably need to mechanically brace the pulley from turning to get it loose. I think I used a screwdriver or a bolt in a hole in the pulley to keep it still. (It's been a long time since that fix.) That's what those holes are there for. Not a bad idea to get a new fan clutch assembly since you'll be right there anyway and you might also consider a new idler pulley. New hoses are also a consideration but on mine, the hoses were still perfect after 15 years when I did mine. You might do it anyway for peace of mind. Be sure to keep the lower spring if the new lower hose does not come with one.

"We have it totally under control. Its one person coming in from China. We have it under control. Its going to be just fine." ~D. Trump, Jan 22, 2020.
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post #4 of 6 Old 11-23-2021, 09:48 AM Thread Starter
bfry
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Appreciate it - was able to get a tool that held the pulley in place - inserted that into the pin holes in the pulley and then attached a 1 3/8” crescent to the fan nut and hit it a few times with a hammer to loosen the nut and then was able to just spin it off. Had put some PB blaster on it and wasn’t bad at all. Mine was not reverse thread fwiw if that helps anyone else out there.

With flush, new thermostat and new water pump the truck is now running just below 210 - pinned there - doesn’t move - it had been running consistently around 225-230 so very happy with the fix!
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post #5 of 6 Old 11-25-2021, 08:49 PM
rjh41388
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I’ve always used an air chisel to remove mechanical fans. Also look at the new water pump threads to find out if they’re left or right hand threaded. I’ve done tons of 3.7 and 4.7 water pumps at the dealership and still can’t remember if they’re reverse threaded. You absolutely don’t want to inadvertently tighten it with an air chisel. You may never be able to get it off. I know this because I’ve done it. Also loosen the upper radiator support and move it forward to give you more clearance to get the fan out. Other than that, these are the easiest water pumps I’ve ever done.
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post #6 of 6 Old 11-26-2021, 03:01 PM
WJ04JGC
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Quote:
Originally Posted by rjh41388 View Post
I€™️ve always used an air chisel to remove mechanical fans. Also look at the new water pump threads to find out if they€™️re left or right hand threaded. I€™️ve done tons of 3.7 and 4.7 water pumps at the dealership and still can€™️t remember if they€™️re reverse threaded. You absolutely don€™️t want to inadvertently tighten it with an air chisel. You may never be able to get it off. I know this because I€™️ve done it. Also loosen the upper radiator support and move it forward to give you more clearance to get the fan out. Other than that, these are the easiest water pumps I€™️ve ever done.
"I support this message" 🤣 and have personally used the same method on my own WJ. It works great! LGB
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