6.5 chevy diesel

dbNga

Member
Friend is looking at "99 Chevy 3500 w/6.5 diesel to tow his tractors. Looking for info on reliability/problems w/this engine. Anyone have any thoughts good or bad appreciated. This truck is showing extremely low mileage.
 
They aren’t a bad truck they are only good for about 16 mpg which isn’t bad they aren’t super powerful . If the fuel solenoid driver hasn’t been relocated to the front bumper do it . They drive nice . They aren’t a heavy duty diesel but they aren’t bad for what it is . I’d buy one if the right deal comes along they have 2 crankshaft dampers rev it up to about 3000 rpm if it has a vibration there or anywhere at a steady rpm Parked in nuetral or park it needs a new damper set make sure you torque them to spec
 

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A 6.5 will last a long time, if it hasn't been hooked to a goose neck trailer and pulled the snot out of it,What happen's if it's been worked hard is the webbing in the block breaks,on the main bearing support, and once that occurs it looses oil pressure and its all over! I bought a 95,new still have it, run likes a dream 210,xxx miles,but i baby it most of time, i even plug it in,, when it sits in the garage to take the knock out of it, in the winter, not because it wont start, it starts good. How did the previous owner change oil etc ??
 
I relocated the fuel driver also like SV stated, most injection shop have a kit for that,not a big deal,but the way GM had it,it gets to hot!
 
By '99, most of the problems were fixed, but it would still be better to leave it where it is sitting. You never know what you are getting with a 6.5. I have had customers get 300+K out of one with no problems, and I have seen them break down everytime it rains. The 6.5 is also not what people expect of a modern diesel. They are not a power house. The 6.5 turbo diesel was designed to have the power of a 350 gas, with the economy of a 6 cylinder. It does that very well. It IS NOT a Cummins, Powerstroke, or Duramax in power levels.

Possible problems? Fuel driver module, fuel shut off, fuel lift pump, optical sensor (pump replacement), broken harmonic balancer leading to broken crank, cracked blocks, cracked heads. All of these repairs can be more than a '99 is worth, so pay accordingly for the truck.
 
Yep I can do a lot of repairs on my 99 F550 diesel for the cost of a new truck,it been a very reliable truck with very few problems would drive it anywhere.
On the other hand those GM 6.5 diesels were a dog from the get go.
 

I paid a lot less than that for Mrs B&Ds GMC crew cab 1500 max towing 6.2 with every option and four extra rim with winter tires .
 
After all the troubles I had in the past with GM diesels you could not even give me one for free !
 
My dad bought a new one in 96 to replace a 6.2. At the time the diesel race was heating up. Our local media people tested all three makes and they were supposed to be about equal in all aspects. Nope. It was a beautiful truck ordered just the way he wanted. Anemic on power, crappy on mileage. It would run hot on a 70 degree day. It went to the shop every other month for repairs that "we know whats wrong,, they all did that". I still have the letter from GM that he got a few years later that said "we know they all have overheating problems, we won't fix it but will give you a discount on a new truck". CTD ever since
 
Had one in a 2000 4x4 crew cab dually. Its really weak compared to other diesels of that time. Tuners dont work on it. Some of the electronics fail, lift pumps also. It will over heat fairly easily. Even just going up a steep hill without towing anything. For just riding around in they can be ok. For working I would look at something else.
 
(quoted from post at 20:52:31 01/26/21) Work one everyday . You can do a lot of maintenance on an
old truck for one 900$ truck payment

On a truck that you know, yes. You've owned that truck for how long again? The truck wasn't 22 years old when you bought it, and you've run it, maintained it, and fixed it in that time.

When it's a truck that you DON'T know, it's different. You're buying someone else's problems, no doubt. You're buying a truck that is well known for not being all that powerful, reliable, or durable, and is 22 years old.

Let's put it a different way. Put a price on your truck. If you had just laid eyes on your truck for the first time today, not knowing anything but what you could see in front of you, a 22 year old truck with hundreds of thousands of miles on it, would you consider buying it at that price?
 
The 6.2 and 6.5 were best in half ton trucks, and mostly made for improved mpg's over a gasser. GM never should've put those motors in 3/4 and 1 ton trucks, since they weren't built for pulling in the first place, and they new it, yet kept using them.
As for using an old truck daily, my work truck is a 1987 F250HD 6.9 idi, and my 1987 International s1600 6.9 idi, which I use for hauling hay and lumber. They earn their keep, and are a lot cheaper to run and maintain than a new electronically controlled diesel. Personally, I would stay far away from the 6.2 or 6.5, and in general a better choice is a 5.9 12 valve, or 24 valve cummins, 7.3 powerstroke, 6.9 or 7.3 idi turbo.



Rock
 
I bought a 2002 3500HD stake/dump body couple of years ago for $2000 with 150K miles on it, has that engine. Was a delivery truck for a lumber yard. There are some good you tube videos on consistent problems with them. I've made a few 1000 mile trips without issues to pick up equipment, but have not towed with it. the cabs tend to rust in the rear corners and rockers panels, replacement sections available on-line, that's on my project list
 
I don't think he'll be pleased. bad tow'r and bad reliability! truck couldn't been a real winner with a good engine!
 
A buddy had one in a duallie to tow his sprint car in an enclosed trailer, not a very heavy load, and it wasn't used for anything else. If you tried to go over 50 (questionable) the temp guage would climb. Was a true doggo, acceleration with the trailer was embarrassing. He babied it something fierce to get by and sold it. Much better to get something with a real diesel- my 2001 F350 SD/7.3 has 100hp added, tows like a beast, has 300K miles, and I have replaced the alternator and water pump- that's it. Starts and runs like a train, and you can torque it up and roast all four rear tires when the kidz are crowing about their new gadgetmobiles
 
There are a lot of ways to cure the overheating . A company can reprogram the ecm and with some modifications you can push 10 and 15 pounds of boost instead of the 3 with factory settings and that keeps them cooler
 
I have never ever bought one with less than 200 to 250,000
then red dually had over 350,000 when I bought I miss that
truck totaled it
 
Ya and they are closer to 90 for one you want to work like a tented mule and then you get into emissions and all that crap
 
(quoted from post at 11:16:48 01/27/21)

I have yet to have a GM pickup of that era come into the shop that isn't packed full of bugs (and if used as a work or farm vehicle, grass, straw, and debris) between the AC condenser and the radiator.

Keeping that area and the condenser and radiator free of debris sure helps with the cooling.

I personally have a 1994 K1500 and a 1995 K3500 and they have been decent vehicles for me.
 
Ill second Sv's comment I've worked on alot of em and owned a few of em.. 93 was the best, it was still a mechanical inj pump.. you could make those run.. the next was the down pipe and stock exhaust.. then up the boost a lil it will run.. the last 93 we did (3/4 4x4 with the 4500 5spd) would get 20mpg all day long running down the highway loaded with tools.
 

11,000 lbs is not shabby . And above most pickup truck drivers license. In fact more weight than these beloved diesels of the 1990s .
Why are so many bass boats hauled by diesel dualies .
 
😂😂 a whole bass boat Whoopi 😂 please bring your 1500
mail delivery car over we’ll load it
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For heavier loads I would
Move up to the 3500 with the 6.6 DI gas .
Lets see you pull into an interstate weigh station with a couple of those loads and find out how it goes .
What do you plan on towing with when that truck is too far gone to repair ?
 
Here's the way I keep most debris and dust and bugs out of my radiator fins in my cars and trucks as well as my tractors. Furnace filters. Works like a charm. I've been doing it for years.




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