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water pump relacement 98 4.0 sohc

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Old 08-14-2010, 01:32 PM   #1
rainbow9
avon new york
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US water pump relacement 98 4.0 sohc

Hello again , I am going to attempt a water pump relacement on my 98 explorer with a 4.0 sohc..240,000 miles. It leaking from around the pump gasket from what I can see. The truck runs hot under load but temp is good any other time.

There is a thread with pics and step by step but it look like a 96 explorer w/V6 not sohcV6 like mine..any difference in the procedure??

Any tips or other step by steps in here to help out. I simply can't afford a shop right now. I have done some tough repairs on this truck, it still runs great, tranny good,motor has very little Mobil 1 syn burning off yet

Thanks alot!!!
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Old 08-15-2010, 08:29 AM   #2
rainbow9
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Hi again . I was reading about a water pump "weep hole". could it be leaking from this hole because the thermostat is stuck ??

Thanks hoipng for a response
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Old 08-15-2010, 09:14 AM   #3
2000StreetRod
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weep hole

water that leaks past the bearing seal escapes via the weep hole. If it is leaking then the pump needs to be replaced.

Be careful with anything attached to the thermostat housing. It is made of plastic, cracks easily, and is expensive to replace.

You will need the Ford tool to loosen the viscous fan clutch nut. They are available at most local auto parts shops. The big nut loosens counter-clockwise.
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Old 08-15-2010, 09:25 AM   #4
Xplorer82
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Originally Posted by rainbow9 View Post
Hello again , I am going to attempt a water pump relacement on my 98 explorer with a 4.0 sohc..240,000 miles. It leaking from around the pump gasket from what I can see. The truck runs hot under load but temp is good any other time.

There is a thread with pics and step by step but it look like a 96 explorer w/V6 not sohcV6 like mine..any difference in the procedure??

Any tips or other step by steps in here to help out. I simply can't afford a shop right now. I have done some tough repairs on this truck, it still runs great, tranny good,motor has very little Mobil 1 syn burning off yet

Thanks alot!!!
the water pump is pretty easy to replace. my first tip would be to buy a prestone back flush kit($7.00), install it and back flush the system out via the directions on the box (if you never done it before). that way all the crap gets thrown through the old water pump and not the new one.. you will need the fan clutch set as 2000streetrod stated above and/or make your own version of them for future removal.

with that being said, here is the thread i followed to do my water pump.
http://www.explorerforum.com/forums/...r+pump+removal

remember back flush the system out (and reserve tank as well) before you start the process.


edit...... another tip, cover the Knock sensor with some rags before you unbolt the water pump otherwise it will get a coolant soaked bath. and of course plug the holes and wire wheel the block off where the new gasket is going to go. i cleaned mine w/acetone before applying the gasket sealant to make sure it got the best hold.

if i think of more i'll be back.




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'98 Eddie Bauer. 4x4, 4.0L SOHC. 190k miles and counting, Flowmaster 50 series, Amsoil Ea air filter, 31x10.5" Sumitomo All-Terrain & the dreaded rattle.

R.I.P : '97 XLT - it was a good 8yrs..

Last edited by Xplorer82; 08-15-2010 at 09:39 AM.
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Old 08-16-2010, 06:41 PM   #5
rainbow9
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wow, Thanks for all the tips!!!

I am definetly going for it, just waiting on another car so I can pull this hog into the garage and get busy.

This board is the best, I'll check back in when I get her fixed up
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Old 08-16-2010, 08:08 PM   #6
vegasjoe1969
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You can also use the oil filter removal tool made of rubber traps to hold the pulley, make sure to get the largest one.....

http://www.harborfreight.com/2-piece...set-94119.html

it is easier to use than the 2-piece tool that 2000streetrod mentioned, as far as I experienced it since I just did the same thing 10 days ago....
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Old 08-16-2010, 10:29 PM   #7
Xplorer82
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Originally Posted by rainbow9 View Post
wow, Thanks for all the tips!!!

I am definetly going for it, just waiting on another car so I can pull this hog into the garage and get busy.

This board is the best, I'll check back in when I get her fixed up
not a problem

one thing i forgot to mention about installing the back flush kit "T" is to drain the coolant before you cut into the hose mentioned in the directions on the back of the box. otherwise once you cut that line, coolant will be everywhere. then proceed with the back flush followed by the water pump removal.

and be careful to not hit the radiator to hard with your tools. i ended up w/a few dings, nothing major.




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R.I.P : '97 XLT - it was a good 8yrs..
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