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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 02-09-2008, 07:07 AM   #1 (permalink)
madcarson
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6.5L trbls?

Hi new to site hello everyone ! My98 6.5L just began using coolant,nothing in oil but,lots white smoke in exhaust,I'm guessing head issues ? I started to take apart got pass side off today looks good so I'll pull drivers head tomorrow!

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Old 02-09-2008, 08:09 AM   #2 (permalink)
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welcome to the 'Place. before anything is said read here about the coolant system Coolant Reference Thread

once you read through that it will teach you of the cooling systems shortcoming in the early models of these trucks. But to answer your question yes coolant being burned is bad. could be a cracked head cracked block or bad headgaskets. Anyway you slice it your truck has been overheated so i would go over everything with a fine toothed comb. if that block is cracked then its probably no good. if the heads are cracked into the coolant passages its time to buy new heads. when removing the heads replace the gaskets of course. good luck and hope everything turns out ok.

- Dave

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Old 02-09-2008, 08:13 AM   #3 (permalink)
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Quote:
Originally Posted by madcarson View Post
Hi new to site hello everyone ! My98 6.5L just began using coolant,nothing in oil but,lots white smoke in exhaust,I'm guessing head issues ? I started to take apart got pass side off today looks good so I'll pull drivers head tomorrow!
A few more questions on my part to figure this out. First put your truck info in your Signature Line so we know exactly what we are dealing with.

Second. Does the truck some white when the engine is up to temperature?

Third. How much coolant are you using?

Fourth. Have your oil analyzed because that will tell you if there is anything in your oil better than any other way of checking. If the oil is even a little milky then thats very bad.
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Old 02-09-2008, 09:05 AM   #4 (permalink)
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Quick fire way to check if it's head issue is cold start, your radiator hose getting hard from combustion pressure entering the coolant system.
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Old 02-09-2008, 09:10 AM   #5 (permalink)
SteveM
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You should see milky oil gunk under valve covers, in the cdr and hose from the cdr to the turbo if the water is getting into the oil. I just put mine back together, was lossing coolant but no other symptoms. I could see some water droplets on the dipstick though. I would pull the pan and inspect for cracks in the block also. I never found an obvious leak in my head gaskets though...I think I found it before it got to bad.

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Old 02-09-2008, 09:11 AM   #6 (permalink)
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I have to disagree with Knreb, mine was leaking into oil only. No overheating issues ever.
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Old 02-09-2008, 09:20 AM   #7 (permalink)
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Quote:
Originally Posted by SteveM View Post
I have to disagree with Knreb, mine was leaking into oil only. No overheating issues ever.
interesting....
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Old 02-09-2008, 10:10 AM   #8 (permalink)
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when mine went it took the tank off the radiator 20.00 gasket turned into 400.00 radiator. i have the best luck. so i thought, come to find out it was both heads. now its a 1200.00 fix and im the laborer. ye ha.

if it was still to gather you can take off th goose neck. fill with water and run with out belt and you will see wich side the air bubble are from.

-sam
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Old 02-09-2008, 11:02 AM   #9 (permalink)
madcarson
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No press. trbls in system,white smoke pretty much all the time, it was using about gal/150-200 miles,no white **** under valve cover or on stick that's why I'm confused as to where it's going,yet signs of coolant in breather hose to turbo!
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Old 02-09-2008, 01:13 PM   #10 (permalink)
teroma25
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Quote:
Originally Posted by SteveM View Post
I have to disagree with Knreb, mine was leaking into oil only. No overheating issues ever.
Sorry but me too.
The first time my heads went, I got major pressure into the coolant. The second time, which was a crack above a valve, I got coolant in my oil only. On the 2000 we just got, which was a cracked block in the bottom of cyl's 5 & 7, we had coolant in oil only. If these cracks were at the top of the cyl's, there should've been pressure in coolant.
Anytime I work on one, the first thing I do after removin' valve covers, is pressure test it. If you can remove valve covers and oil pan then pressure test, even better!

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