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F-250 SD 7 3L Diesel Engine help

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Iowafun
Join Date: Jul 2004
Posts: 955 Central Iowa
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2006-01-16          122840


Need some help for my 2000 F-250 SD with 7.3L Diesel. It's developed an aweful squeel in the front of the engine. It's something that turns as it fluctuates with RPM. The truck has a new water pump (old one exploded badly) and I just replaced the alternator 1 week ago (it died). It has 135k miles. any ideas? I'm having trouble tracking it down.

I pulled the top idler pulley Sunday but the bearing there is not loose or makes noise when I spin it by hand. I'm worried the compressor or pwer steering pump may be going considering the major components that have all died within 7-8k miles of each other (water pump & alternator).




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yooperpete
Join Date: Jan 2004
Posts: 1413 Northern Michigan
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2006-01-16          122842


Could be a bad bearing on the belt tightener. Turbos also have bearings. ....


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Murf
Join Date: Dec 1999
Posts: 7249 Toronto Area, Ontario, Canada
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2006-01-16          122843


When one of ours have had that squeal it was always the spring-loaded serpentine belt tensioner.

They're dead easy to change and not much money.

BTW, you can't tell they're bad by just turning them either. We went round & round on the first one, after much unsuccesful diagnosis we went with the dealers advice and just replaced the tensioner. That was the culprit.

Best of luck. ....


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Iowafun
Join Date: Jul 2004
Posts: 955 Central Iowa
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2006-01-16          122856


Murf, I've been suspecting the tensioner. Did you change out the whole tensioner or just the pulleys w/ bearings? I've tried to look on the net for finding the pulley's but haven't been successful so far.

I'm willing to spend the money and swap out those parts if it's reasonably priced. Heck, the squeel drives me nuts and I hate to give the Dodge & Chevy boys ammunition. ....


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yooperpete
Join Date: Jan 2004
Posts: 1413 Northern Michigan
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2006-01-16          122857


I had a Mercury Mountaineer with about 135,000 miles that started squealing. A shop replaced the tensioner. Same thing happened about a month later. Let it get so bad that it stopped rotating. Engine started to get hot! Had it towed and found out there were 2 tensioners. ....


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Iowafun
Join Date: Jul 2004
Posts: 955 Central Iowa
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2006-01-16          122858


Actually, before I get too far, there are 3 miscellaneous smooth pulleys on the engine. 2 are on the tensioner and one at the top. Is there any way to figure out which one is doing it? I don't have one of those stethoscopes some mechanics use for isolating noise.

I checked the local parts supply place and they have one in stock. I'll just pick it up and swap out at least one pulley. If the noise exists, then onto the next one I guess. ....


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Murf
Join Date: Dec 1999
Posts: 7249 Toronto Area, Ontario, Canada
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2006-01-16          122860


The tensioner is an assembly, pulley, bearings, sprung arm, everything in one.

I grumbled at first, but the parts man said if the bearing was shot the spring was likely not at spec. either anymore, hmm, good point. Besides, the bearing is a press fit affair, and like as not I'd break something trying to either pull the old one out or press the new one in.

That said, also check the belt itself. If the belt is getting old and hard, or there is an accumulation of dirt on the smooth side it will do the smae thing. On these trucks the back side of the belt is the driving side for certain devices in the system.

Best of luck. ....


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kthompson
Join Date: Oct 2005
Posts: 5275 South Carolina
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2006-01-16          122861


I am sure you have checked the fluid in your power steering pump. I had a Ford that is even a little low it would do the same.

I think you will post it was the tensioner assembly also.

....


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yooperpete
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2006-01-16          122862


I'd STOP THE ENGINE when it is only moderately warm. If you place your hand on each of the tensioners, the bad one should be warmer than the rest.

....


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Peters
Join Date: Feb 2002
Posts: 3034 Northern AL
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2006-01-16          122870


I piece of thin tubing can act as a stethoscope. You don't need both ears. I used to keep a piece of the thin PVC clear flexible tubing they used on fish tanks in the tool box. For comfort you can use a disposable ear plug with a hole in the middle hold the tubing in the ear. ....


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kwschumm
Join Date: Feb 2003
Posts: 5764 NW Oregon
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2006-01-16          122876


Heck, you can use a long screwdriver as a stethoscope. Put the blade end on the suspect area and hold your ear next to the handle. A hard plastic handle works best. Sometimes you can even feel the noise through the screwdriver with your fingers. ....


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Iowafun
Join Date: Jul 2004
Posts: 955 Central Iowa
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2006-01-17          122878


Well, I checked the power steering pump and it was low. So that's topped off. It didn't take much at all. That wasn't it.

I replaced the tensioner since that was the next logical item and much less than a compressor or steering pump. It did nothing. BUT, after driving in this morning so it had some miles on it, the noise was significantly less. I don't mind the new tensioner as I could tell the difference between the new and old when installing the belt.

I know it's not the belt since it got a new belt when the truck got a new water pump. I'm going to run it a few more days and see if the noise stays improved. I should be able to tell when I leave work.

Replacing the tensioner wasn't bad except you can't see the bolt and I couldn't get it out once I had it off. So I held it with my left hand while I removed another pully with my right hand to clear out space. Then it was ok. ....


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Iowafun
Join Date: Jul 2004
Posts: 955 Central Iowa
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2006-01-17          122879


Also, I did use a piece of clear tubing to try to find the sound after I replaced the tensioner. I was unable to locate the source. But it may be coming from down low where I wasn't willing to place the tubing due to high speed rotating objects being in the way.

When the water pump blew, coolant got everywhere. The first replacement pump also leaked. So significant coolant may have gotten onto some pulleys and just hasn't been cleaned off yet. The new tensioner may help with overriding that slippery stuff. Just a theory. ....


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Peters
Join Date: Feb 2002
Posts: 3034 Northern AL
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2006-01-17          122887


TWO WORDS!!! CLUTCH FAN? ....


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Iowafun
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2006-01-17          122890


Peters, I may go there next. Lots of items in that area took a bath when the water pump blew. I'll see how the truck runs tonight after work. ....


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Iowafun
Join Date: Jul 2004
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2006-01-18          122973


Well guys, after a full day on the new tensioner, the noise is better, but not completely resolved. Sigh... onto the next possible source. We'll see how far along I get. ....


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Murf
Join Date: Dec 1999
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2006-01-18          122978


If the tensioner improved the situation much I would have to say that the glycol rinse is likely the culprit.

Something is still slipping, but not by much.

Best of luck. ....


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yooperpete
Join Date: Jan 2004
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2006-01-18          122980


Did you replace more than one tensioner? Peters may also be correct about the fan clutch. Mine went out on my old '89 F-250 with a slight noise. ....


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oneace
Join Date: Mar 2004
Posts: 1490 south central pa
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2006-01-18          123004


Grab hold of the fan blade (while the engines is OFF) and see if there is any movement front to back. There should only be the flex of the fan and nothing else. If the is even the slightest I would replace it. Other wise you could be buying a new rad too. ....


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Peters
Join Date: Feb 2002
Posts: 3034 Northern AL
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2006-01-20          123082


Sorry I was travelling and needed to be brief. I have heard clutch fan squeal also, usually the sound is different than a belt or pulley, but with the sound changing and it having been bounced around with the water pump replacement? It was the first thing that leaped to my mind, but I thought you were on the right course with the tensioners. ....


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Iowafun
Join Date: Jul 2004
Posts: 955 Central Iowa
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2006-01-21          123172


I haven't had time to look at it sice I put the tensioner on the truck. The sound is like a rattle rather than the typical belt squeel. That's why I was worried about more expensive parts going. I'll check the fan next since that got shifted when the waterpump blew.

The water pump blew the bearing pieces out so the shaft that held the fan was just hanging there. The fan didn't get into the radiator (thankfully), but I think it got a glycol bath. Thanks for telling me how to check it, peters. ....


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Peters
Join Date: Feb 2002
Posts: 3034 Northern AL
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2006-01-21          123178


It is sounding more and more like a clutch fan. Now if we can just get Dennis to add the ability to include audio clips!!!
Oneace provided the description before I had a chance. As usual it is a team effort here. ....


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oneace
Join Date: Mar 2004
Posts: 1490 south central pa
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2006-01-21          123186


Yes there is no "I" in team. Fan clutches are generally not that expensive. But depending on what type you have you may or may not need a special tool to remove it. I never looked that closely at the PSD fan so not for sure which one you would have. Most Fords you do need it but since the engine is made by International I have no clue.? ....


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Iowafun
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Posts: 955 Central Iowa
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2006-01-27          123606


I grabbed the clutch fan last night and didn't feel any fore/back motion. However, it's fairly stiff to rotate. Any idea on how the fan clutch is supposed to feel when rotating it? Smooth? Free? Stiff? Is it supposed to free-wheel if you give it a spin? ....


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Peters
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Posts: 3034 Northern AL
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2006-01-27          123612


They should move when they are cold freely and smoothly, but with some resistance from the oil in the clutch. If you give it a had spin it should turn nearly one revolution. ....


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Iowafun
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2006-01-27          123613


Well, it's no free wheeling Peters. Give it whirl and it stops when you stop. I think I may check one out at the auto parts store and get a feel for how it should spin. If I detect a difference, then I'll replace it. ....


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oneace
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2006-01-27          123615


Every clutch feels a little different. You are right go to the parts house and see how tight a new one is. If the fas is not releasing like is should you fuel mileage will suffer by about 10 to 15 percent. ....


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Andy_H
Join Date: Sep 2003
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2006-01-29          123717


The fan clutch will not spin freely but will move when you turn in by hand when cold, when warm it will turn a little easier. Did you give the front of the motor a good bath to get rid of all the coolant that came from the water pump. Its good that you replaced the tensioner assembly, they do loosen up over time, not just the bearing. You say the sound got a little better when you replaced the tensioner? Try spraying a little water on the belt, if the noise goes away for a second, replace the belt and check all pullies to make sure they are clean, I know you already replaced the belt, but they don't like getting wet with coolant. Put a long screw driver to your ear to check for bearing noise, this is the easiest way to find your noise, compare all the pullies, you will know when you have found a bad one. ....


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