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Tractor Transporting Discussion Forum

Re: '94 K2500 6.5L diesel ????

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FC Andy

06-06-2011 14:35:01

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Well, you'd better get it cheap. It's an old truck with a few inherent problems.

1. Those trucks before 1997 (I have a '97) have a single thermostat water crossover pipe. They are known to overheat under load. It is upgradeable to the dual thermostat setup found in '97 and later, and it may be best to do that if it hasn't already been done.

2. '94 and later trucks have a computerized Injector pump. These computers are known to go bad, as they overheat. You can buy a relocater kit to move the PMD it is called to a heat sink at a cooler location than on the side of the pump. Mine had that done with a hillbilly setup, I need to buy a nice one, as mine starts hard when hot, and I belive that is the Issue. (At least that's what the 6.5 performance shops say)

In the end, If you do some research, and are well informed and mechanically inclined, they can be a good truck. Mine has 140,000 on it, and I bought it with 126,000 last september. It has made 2 500 loaded mile trips for me, and other than having less power than a person would hope for, it is serving me well. It will get the job done, just not as fast as a duramax or powerstroke or cummins. If you have a lot of hill country you plan on hauling your tractors through, you may be annoyed by that particular truck. An A and a 50 is what, 9,000 plus trailer? That's more than I'd want to pull through hill country with mine. I pulled my 450 Diesel farmall with loaded tires on one trip, weighd about 7,000 I guess and that was plenty for me.

Hope this helps! -Andy

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Allan In NE

06-07-2011 06:59:29

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 Re: '94 K2500 6.5L diesel ???? in reply to FC Andy, 06-06-2011 14:35:01  
I worked for Chevy for the better part of 36 years.

That 3/4 ton '94 diesel was the worst truck they ever run off the assembly line.

Believe me, you don't want it.


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06-30-2011 07:54:59

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 Re: '94 K2500 6.5L diesel ???? in reply to Allan In NE, 06-07-2011 06:59:29  
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I have to agree with allan.

The 6.5L is a highway crusier and that's it. no power to do anything. i also had the pmd fail on me.

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06-06-2011 16:31:27

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 Re: '94 K2500 6.5L diesel ???? in reply to FC Andy, 06-06-2011 14:35:01  
"Those trucks before 1997 (I have a '97) have a single thermostat water crossover pipe. They are known to overheat under load."

It ISN'T the dual 'stat conversion that keeps 'em cool. it's the (much) higher-flow waterpump that goes with it. Installing a cutdown (to fit) D-max fan and D-max fan clutch help, as well

MANY of the problems associated with that engine (overheating, failing PMD's and pumps, etc.) could have largely been solved if they would have installed an intercooler. When pulling them a bit you could fry eggs on the INTAKE manifold!

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FC Andy

06-06-2011 17:51:33

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 Re: '94 K2500 6.5L diesel ???? in reply to Bob, 06-06-2011 16:31:27  
You know, at the time, I didn't even think about the water pump. In the upgrade kits I've seen, it comes with the dual thermostat housing. If you bought the upgrade kit, you'd use all the parts, right? :)

You're right about the intake. Underhood temps in general are warmer than one would think. Considerably warmer than the gassers I have. But I've read that the intercooler kits you can buy are wothless. They put them in asinine locations, at least for a 4wd. -Andy

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