6.5 Turbo Diesel engine....good or bad? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-08-2007, 12:53 AM   #1
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Default 6.5 Turbo Diesel engine....good or bad?

I am looking for feedback on this engine as I am considering buying a truck with one in it. Any comments?
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Old 08-08-2007, 12:56 AM   #2
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The 6.5 DuraMax?
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Old 08-08-2007, 01:03 AM   #3
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Yes. Sorry I wasn't more specific. My husband has some questions about its track record and potential problems.
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Old 08-08-2007, 01:29 AM   #4
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One of the worst diesel engines..ever...

Owners like to brag how many times they have rebuilt their engine in the past 200,000 miles, that cant be a good thing lol....there are a couple forums out there with the "common problems" and such.

Broken Crankshafts, Cracked Heads, Blowby, Faulty Injection Pumps, the list goes on. i just sold my 6.5 after I found out what the repair costs are associated with the items and the frequency many people have with severe failures on the trucks.

http://www.62-65-dieselpage.com comes to mind

Lets not forget the trucks have poor resale value.

If you need a diesel look at a dodge, they are generally considered much more reliable...you can probably get a cummins with higher miles around the same year that will likely be much better in the long run

duramax are a whole different story as far as reliablity goes, they are signifcantly different

Dont take my word for it..talk to a few mechanics that have first hand experience with the early chevy diesels.....
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Old 08-08-2007, 03:16 AM   #5
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i worked at a chevy dealership for a while we mainly had problems with fuel delivery on the 6.5'* and uhh...just dont get them wet...ever.
one of our detailers washed down a motor and it ruined the truck, a brand new 06 right off the trailer, we just had our driveway paved so all the dust went everywhere they had to clean everything up, but any who the truck was running he sprayed some engine degreaser on it quickly rinsed it down it ran fine he pulled it out of the wash bay, started it up the next day and i guess it dropped a cylinder because it was misfiring and sputtering the mechanics took a look at it diagnosed nothing, and i also talked to one of my friends at a neighboring dealership whom was a detailer at the time, the same thing happened to him on a 2006 deisel maybe it was just the year i have no idea but i just suggest you dont get it wet from my personal experiences lol
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Old 08-08-2007, 03:42 AM   #6
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Default 6.5 Turbo

The GM 6.5L Turbo Deisel engine is what we use in the Army on our Up-armored HMMWV'* (Hummers), Lets just say we replaced three of them last week and have one going into the bay today. Granted, due to the our situation out here sometimes it is easier to swap an engine, get the truck back on the road and then do a head gasket job while the engine is sitting in the corner of our building, but we have a lot of trouble with them. I am honestly not sure if this is the exact engine that is used on the civ side, but I am thinking there cant be much differance if it is not.


jake
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Old 08-08-2007, 03:48 AM   #7
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any idea why they are sensitive to wet? i dont see the issue there? i mean whats the deal there?

i've seen that the new 6.6 duramaxes produce the most power with mods simply because they're a V8 against the traditional I6 for light duty applications such as a pickup
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Old 08-08-2007, 05:34 AM   #8
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I think the truck they are looking at is a '94. Would this be the same 6.5 you guys are referencing? Was the 6.5 any different back in '94?
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Old 08-08-2007, 01:33 PM   #9
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The 6.5 is a completely different creature than the 6.6 Duramax... The 6.5 injection system was designed by Stanadyne. The 6.6 Duramax was designed "mostly" by Isuzu.

I used to work on the GM Techline for the 6.5 diesel... Unless you plan on replacing the wonderfully engineered Stanadyne injection pump at leats once a year, pass on it... The design of the optical sensor in the pump is super sensitive to any sort of debris and contamination. If you get even the smallest bit of debris past the filter or you get some bad fuel, you either won't be able to start it or you'll be diving for the shoulder of the road when it dies on you. 9 out of 10 driveability issues with the 6.5 are caused by the injection pump. I won't even get into talking about mechnical failures on those...

I used to cringe when I'd see an ambulance that had the 6.5 in it
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Old 08-08-2007, 01:57 PM   #10
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6.5 is not a Duramax by the way. 6.5 litre was designed by detroit deisel I beleive. Its a weak motor anyways.
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