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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 10-22-2017
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JustLoafin JustLoafin is offline
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Default Tightening alternator pulley

OK...I am out of my league on this one. Would appreciate some insight.

Pulled out the old (bad) alternator. It came out surprisingly easy (had to swing the radiator, and pulled out the air intake hose on passenger side engine access and it came right out, after pulling off the other belts).

Pulled the pulley off the old alternator..again, easy.

Mounted the pulley on the new one...so far, so good.

But it says to torque to 70-80 lbs?

My torque wrench only goes to 80...OK...I guess I will need a better one for future projects. But how do I get that kind of torque on this...the darn thing spins! Do I stick a screwdriver in the blades of the "fan" that sits right below the pulley (the one that says to torque to 70-80 lbs)? That seems wrong...but not sure how else to be able to get that kind of torque on this nut

Any help appreciated.

Here is a pic

https://imgur.com/a/Ac485


Phil
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Old 10-23-2017
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Mike Hohnstein Mike Hohnstein is offline
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1/2" impact and loc-tite.
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Old 10-23-2017
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JustLoafin JustLoafin is offline
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Loc-tite...that is a great idea...thanks!
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Old 10-23-2017
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Put it together first as snug as you can Then install and tighten the belt up. Then use the impact wrench to finish snugging it up with the belt keeping the pulley from slipping.

I suggest Blue loc-tite. Red loc-tote is close to permanent

I defer to Mike H on which color he would suggest. But I think Blue should do it.
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Old 10-23-2017
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Default Tightening the Alternator Pulley

Phil,

I use a channel lock tool with a chain. See website.

http://www.autozone.com/wrenches-pli...171023120344:s

With this holding the pulley, you can tighten the nut to 80 ft lbs easily.

Alan
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Old 10-23-2017
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Tim T. Tim T. is offline
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Strap Wrench,

Less chance of damage to pulley than a chain tool.

Like this.

http://www.homedepot.com/p/Husky-8-i...2365/203526056
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Old 10-23-2017
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Thanks boys, for all the help so quickly. I was surprised how quickly I got that bag a$$ alternator out...getting a break in the rain today/tomorrow...hopefully can get her back together before the rain kicks back in.
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Old 10-28-2017
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Wanted to follow up and thank you all...worked out (pretty) well...I got the belts all tightened to approx 90lbs with Kriket tool.

But I noticed something odd...

3 of the 4 belts are "double belts" (so two belts drive the pulley).

And on two of the applications (the one for the alternator and the one that goes from the crank pulley to the fan clutch pulley), it seems that when I put the belts on, one is a bit looser than the other.

Is this common?

I thought perhaps I had a bad belt (since one was looser than the other) so I purchased brand new ones and installed...and the same problem. The one on the inside is a bit looser than the one on the outside...and if I reverse them, it is the same...so the belts are the same length...but for some reason, when installed, one is a bit looser than the other.

For example, when I tighten up the fan clutch, I get 100 lbs (measured with the Kirket) on the tighter one and 60lbs for the looser one.

I ate up a belt shortly after getting this back on the road...and wondered if that might be the problem.
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Old 10-29-2017
B.Nyhof B.Nyhof is offline
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Did you specify matched belts? Belts vary a lot. Matched belts is where I would start. Brian
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Old 10-29-2017
Clueless Clueless is offline
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The crank pulleys come in slightly different sizes. On mine, the outside bolt on pulley from my old engine was a slightly different size than the inside pulley that came on the new engine. I happened to be at Mike's when I realized the tightness difference, and he fixed me up with the right size.
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