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Caterpillar 3208 Solutions This sub-forum is hosted by Mike Hohnstein who has been at this kind of thing for 50+ years now, guess I'm addicted. The saga has been all about progressively larger shop space since then. Honestly, never wanted to get into the CAT 3208's that were originally considered to be a throwaway engine but that's all that works in a FC in my world. Same thing with my Ford toter, that came with a NA, too much effort to hang in a 6, so been at it with the CAT V-8 for 20 years now. In reality you can get excellent life out of a CAT 3208 if it's built correctly. Post your questions about the CAT 3208 engines here and Mike will try to help you out.

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  #1  
Old 06-30-2019
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Default 3208 squeal under load

Ok...I am stumped on this.

The bus was squealing a tad bit, so I figured it was a belt issue. Swung the radiator this morning and it seemed that one of the belt pairs was a bit loose (60lbs on the kriket), so snugged it up to 100lbs or so (felt well tight)

PUt it all back together, took her for a spin and its 10x worse.

before the adjust, it might squeal a bit when she first started.

Now...she wails when I put her under load...

Any thoughts? I thought tightening up the belts it would reduce the squeal..but it seemed to make it much worse.
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Old 06-30-2019
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You could have a bad bearing in the alternator or on the idler pulley or even the water pump.
I hate to say this,but you will have to loosen all of the belts so you can turn all the pulleys by hand,until you find the problem.
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Old 06-30-2019
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Is that why it is squealing more with tighter belts?

I have gotten the radiator swing down to a science...2 hours...am going to swing her again this afternoon...would tightening the belts increase the squeal if the bearings are bad?
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Old 06-30-2019
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What Randy said, loosen all the belts A LOT and feel the various components, probably have to remove the belts to get a good feel. A start would be to feel the belts from underneath after making noise, the offender will be hot.
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Old 06-30-2019
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Thanks boys. So am I correct that of squealing gets worse with tightening it is not a problem with belt tightness? That it is something else? Also is a water pump something I can swap out on my own in backyard? Or is it bound for the shop if that is the issue?
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Old 06-30-2019
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They are saying it is likely a belt driven item. Water pump IDLER, alternator, power steering pump. Loosen belts and turn each item with your hands, you will probably find the tight one
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Old 06-30-2019
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Tightening the belts increases the load on the various bearings in each of the items mentioned. The more you load a failing bearing, the more resistant it is to rotating. Don't know if you have ever experienced a failing wheel bearing that made more noise with a increase of load because of cornering.
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Old 06-30-2019
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Thanks for the help. It was the 4 bolts holding down the fan clutch. Tightened them and we are back on the road
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Old 06-30-2019
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OK,now heres the monkey wrench.
On the fan bolts,the ones that hold the big casting to the block.
Those bolts go through 2 plates,2 holes per plate,one on each side.
The plates go over the slots in the casting.
Well,those plates have offset bolt holes,if the plates are on backwards they will not stay tight.
that may be your problem.
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Old 07-05-2019
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I was just thinking back to when I replaced my Horton fan hub last year. Yes, there are two little plates that act as a washer and help position the bolts. As I recall, they only went on one way. I put mine on pretty tight with a 9/16" wrench because there isn't much room. I used a bit of blue lock-tite just in case. I didn't want that thing coming loose spoiling my new rad, hub and plastic fan.
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