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F-250 SD 7 3L Diesel Engine help
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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F-250 SD 7 3L Diesel Engine help
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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F-250 SD 7 3L Diesel Engine help
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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F-250 SD 7 3L Diesel Engine help
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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F-250 SD 7 3L Diesel Engine help
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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F-250 SD 7 3L Diesel Engine help
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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F-250 SD 7 3L Diesel Engine help
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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F-250 SD 7 3L Diesel Engine help
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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F-250 SD 7 3L Diesel Engine help
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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F-250 SD 7 3L Diesel Engine help
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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01-16-2006, 09:27 
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