GM 6.5 Diesel Question

Jeff NWOH · Aug 25, 2012

Just picked up a '97 Chevy 3500Hd with a 6.5 TD.

Runs pretty decent with almost 300k on it, but it smokes blue pretty bad at idle after it gets warm. It will almost engulf the truck sitting at a light, but doesen't seem to bad going down the road.

I'm kinda thinking turbo seals. I bought a supposed good turbo from the previous owner for a few bucks, but was wondering if I'm on the right track before I go to the trouble of swapping.

Anything else I should look at? With the mileage on this and what I gave for it, it'll just get run til it dies. Not looking to spend a whole lot on it.

Thanks, Jeff.

DannyE · Aug 25, 2012

I had the same thing with the smoke, was injectors, $350 each on 02 duramax, runs like new now.
dan

El Toro · Aug 25, 2012

The engine may need a rebuild with that many miles. Is it using any oil? Hal

NEKS · Aug 25, 2012

Put it under a good load where you have to keep your foot in it and see if it don't overheat. Have a 92 and can't keep up with the boy's 92 Dodge diesel and can't keep it from overheating. My Chev has 165000 and his Dodge has 340000.

Greenday · Aug 25, 2012

yep injectors are shot

mite-help · Aug 25, 2012

turbo is easy to check for oil coming out of it, also play in the wheel--check & see how much blow-by is going into air intake--it reburns this---make sure that air intake system is clear--some ran up the side of rh fender--gave probls.

redtom · Aug 25, 2012

had a 96. With 300k that engine has run its life cycle. Maybe, maybe a little more if it had ultra superb service. Id say its a combo of everything, valve guides, rings, and injectors. Blue smoke is definitely oil.

bison · Aug 25, 2012

(quoted from post at 06:05:13 08/25/12) Just picked up a '97 Chevy 3500Hd with a 6.5 TD.

Runs pretty decent with almost 300k on it, [b:3dd8af57f8]but it smokes blue pretty bad [/b:3dd8af57f8]at idle after it gets warm. It will almost engulf the truck sitting at a light, but doesen't seem to bad going down the road.

I'm kinda thinking turbo seals. I bought a supposed good turbo from the previous owner for a few bucks, but was wondering if I'm on the right track before I go to the trouble of swapping.

Anything else I should look at? With the mileage on this and what I gave for it, it'll just get run til it dies. Not looking to spend a whole lot on it.

Thanks, Jeff.

lue smoke points to oil in the exhaust post turbo,a bad inj usually causes white or grey smoke.
Is it using oil?

Wont hurt to check the turbo,could be bad exhaust seal, leaking intake seal or high oil pullover trough the CDR (high blowby)causes black smoke as the oil is burned(rebuild kit is only $80 or so.

300 k is getting there,but..
My wife drives a 6.5 with 410 k on it, i have a 6.2 with over 700 k on it,..both run strong.

just saying.

PS,..the 97's have the worst engines of all

David G · Aug 25, 2012

Drippy injectors will do that.

GM 6.5 Diesel Question

Jeff NWOH

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DannyE

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El Toro

Well-known Member

NEKS

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Greenday

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mite-help

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redtom

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bison

Well-known Member

David G

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