Hmmwv fan clutch leak

Steel Soldiers is supported by:

Dayron84

Member
62
12
8
Location
Tennessee
Good morning. New guy here. Just purchased a 94 m998. Seems to be in overall good mechanical condition but I am still learning how works. I have tracked down a power steering leak to my fan clutch. Ive done quite a bit of research on this site and others and still am not clear on exactly how these work. The fan does constantly spin when the engine is running but this seems to be normal from what I’ve read. I did pull the line from the Cadillac valve and apply 100 psi of air pressure. The fan did slide forward slightly but did not rotate. Since I’ve had it the engine temp hasn’t gotten above 180-190 range and it’s cool weather so it might not be warm enough for it to kick on. It’s not leaking a lot of fluid just a few drops after driving for a while. It’s not clear if the leak is coming from the hose fitting or the clutch assembly itself. Just looking for some advice from those of you that have had this problem. I don’t want to pull radiator and dive into this if I don’t need to. Thanks



Sent from my iPhone using Tapatalk
 

Dayron84

Member
62
12
8
Location
Tennessee
I think I’m going to go ahead and pull radiator and replace the clutch and take care of other maintenance items while I’ve got it apart. Does anyone have a good source for a new clutch? Looks like eBay has a few. Fairly expensive. I plan on replacing the serpentine belt, all radiator hoses, and inspecting everything closely. Any other recommendations for maintenance I should take care of? Don’t want to have to do this again for a long time


Sent from my iPhone using Tapatalk
 

Milcommoguy

Active member
414
52
28
Location
Rosamond, CA
Once you peel back the radiator stack, you have to ask your self... Do I feel lucky? Not having any history and mileage may not count to " What's next to go out?"

Having the "stack" out of the way opens up a window to many of the hard to get at parts. You are right ! This would be the time to Check, Repair, Remove, Replace and Check again. Check-check and double check.

IMO, I would be looking at rebuilding clutch (kit cheap) and add QDC ?
Correct new water pump and anything having to do with cooling
Careful check of vibration damper
Anything that spins or turns or pumps or flows or clamps and clips gets a GOOD looking at.
Add in flush, fluids, fill, cap, torque and check
There a lot to eyeball with the hood and stack out of the way. All things mechanical and electrical

It's really hard to say, do this or that. How big is budget, timeline? What do you want to have in the end. (not another headache or heartache for sure)

Get and study the TM's getting a feel of what's going on and how to put it back on.

At this point you're in pretty deep and time to get it right when easiest, CAMO

GOOD LUCK.

Check everything and more>water pump.jpg
 
Last edited:

Andyrv6av8r

Active member
Steel Soldiers Supporter
926
61
28
Location
Spartanburg,SC
Mine was leaking a few drops from the QD fitting on the hose at the clutch. I replaced it from underneath witout removing anything and all is well now.
 

papakb

Well-known member
1,492
86
48
Location
San Jose, Ca
I went out and bought a nice Aeroquip quick disconnect to put into the truck and then thought about it for a while. How often do you need to disconnect the fan hydraulic line? I know it's a pain to work on but I thought some nice aircraft fittings would be a better option and went that route. There are hoses and fittings all over because of the aircraft industry and they're cheap. Now I have fittings that don't leak and no hose clamps!
 

Dayron84

Member
62
12
8
Location
Tennessee
I plan to go ahead and replace water pump while I’ve got easy access. It’s been a while since I’ve done a water pump. Any suggestions as to gasket? Use paper gasket or rtv? Whatever I do I want to make darn sure it doesn’t leak...obviously


Sent from my iPhone using Tapatalk
 

86humv

Active member
Steel Soldiers Supporter
1,241
21
38
Location
High Desert ca and Texas
I plan to go ahead and replace water pump while I’ve got easy access. It’s been a while since I’ve done a water pump. Any suggestions as to gasket? Use paper gasket or rtv? Whatever I do I want to make darn sure it doesn’t leak...obviously


Sent from my iPhone using Tapatalk
Make sure you order the right water pump...as there are two types.....6.2 and 6.5 de-tuned use same one....and then 6.5 NA and turbo use same one.
They come with gaskets.
 

missionexpert

New member
Steel Soldiers Supporter
13
4
3
Location
Houston/Texas
I plan to go ahead and replace water pump while I’ve got easy access. It’s been a while since I’ve done a water pump. Any suggestions as to gasket? Use paper gasket or rtv? Whatever I do I want to make darn sure it doesn’t leak...obviously
I used a gasket sealant because the gasket the pump came with was already ripped or more likely when removing it from the plastic wrap I broke it.
 

Dayron84

Member
62
12
8
Location
Tennessee
Still trying to bleed the power steering after putting everything back together. I have done the wheel lock to lock with engine off and front end raised off the ground 40-50 times. Still have a little whining coming the the steering. I have the newer style reservoir that is on top of the engine with the sight glass on the side. The filler cap is missing the screw that goes in sideways ( not sure what the purpose of that is ). Could the system be sucking air through that small hole? I’ve checked everything else for leaks and all is dry.


Sent from my iPhone using Tapatalk
 

Dayron84

Member
62
12
8
Location
Tennessee

Anyone know if this makes a difference? I’m still having a hard time getting PS bled and wandering if it’s sucking air through this hole. I also installed an inline trans filter when I was replacing all the hoses not sure if that could have any effect on getting the system bled properly


Sent from my iPhone using Tapatalk
 
Last edited:
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks