fan clutch problem
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New User
Joined: Mar 2003
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fan clutch problem
Hello, I have a 92 F150 with 4.9l and 5 speed. I have been having a problem with the the truck bucking, studdering, or something when i am not in the throttle cruising in 4th or 5th gear.
I made a egr restrictor plate for it and installed. This cured the stuttering problem, however on the way home from the lake my truck was getting hot when i stopped for a minute with the a/c on. It is 98 degrees here today.
I turned the a/c off and proceeded ( the needle left the safe zone) and slowly on the interstate the temp came back down to middle of normal.
At home putting the boat up, I turned on the a/c and the temp creeped up again.
With the truck hot, i shut it off and looked at the fan clutch which turned very freely. Do you think that this is the cooling problem or did the egr restrictor plate?
The radiator looks clean, by the way. I am waiting for the truck to cool to check to see if the water pump is acting ok and that the thermastat is not stuck open or something.
thanks james
ps great site
I made a egr restrictor plate for it and installed. This cured the stuttering problem, however on the way home from the lake my truck was getting hot when i stopped for a minute with the a/c on. It is 98 degrees here today.
I turned the a/c off and proceeded ( the needle left the safe zone) and slowly on the interstate the temp came back down to middle of normal.
At home putting the boat up, I turned on the a/c and the temp creeped up again.
With the truck hot, i shut it off and looked at the fan clutch which turned very freely. Do you think that this is the cooling problem or did the egr restrictor plate?
The radiator looks clean, by the way. I am waiting for the truck to cool to check to see if the water pump is acting ok and that the thermastat is not stuck open or something.
thanks james
ps great site
Senior User
Joined: Jun 2002
Posts: 108
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From: U.S.A.
fan clutch problem
I must have gone for 2 years with a bad fan clutch and did not know it. I noticed the engine would get hot as I got off the Florida turnpike and waited my turn at the light. I also noticed it got real hot in traffic. After much looking and thinking I decided to change the fan clutch even though it did seem to be working. I read the Haynes manual description of using cardboard, etc and my old fan clutch did not seem to be failing in a classical sense. Still I thought I would give the job a try. The job is easy to do with the right tools....boy that is a story all its' own...and cheap enough. The results in my case were rather immediate. I have driven in all sorts of conditions and weather and the hottest I can get the meter to get is the the right side of the diagonal line in N on the word NORMAL. The other day I got it up to 80 for about 30 miles and came off I75 into Naples traffic. The needle just refused to go beyond the N. I am sure the complete flush and fresh coolant didn't hurt either.
Elder User
Joined: Dec 2002
Posts: 559
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From: South Carolina
fan clutch problem
Check the hub of the old fan clutch with your finger - reach down between the fan blades when the truck is cool - if there is a lot of grease around the spring in the center of the clutch, that's generally grounds for replacement. It means the viscous fluid has leaked out - you'll need a special spanner for grabbing the old fan clutch. It fits where the fan bolts to the clutch.
Senior User
Joined: Jun 2002
Posts: 108
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From: U.S.A.
fan clutch problem
Yeah when my old fan clutch came out it had grease and dirt on the front. It is sort of hard to notice that as it is tucked way under the fan shroud. I would advise you to obtain the correct special tool for this job. There is a tool that holds the water pump pulley from moving and a thin spanner than unscrews the nut holding the fan clutch on. Make note of which direction the screw comes off...on my truck it was printed on the fan shroud. I warmed up the engine and then sprayed the but with PB Blaster. After messing about with the wrong tool for days it was almost silly easy getting it off with the right tools.
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New User
Joined: Mar 2003
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fan clutch problem
just a quick follow up. Checked the fan clutch and it was all oily. There was no difference in spin between engine hot or cold.Replace fan clutch heating problem is now gone and a/c is working better. Thnks for the help
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Senior User
Joined: Jun 2002
Posts: 108
Likes: 0
From: U.S.A.
fan clutch problem
Its kind of rewarding to get that done, huh? My fan clutch seemed normal but the difference after it was changed is dramatic. I asked myself why I didn't do this before....and why the mechanics I was paying didn't notice this. Glad it worked out for you!
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