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Old 10-23-2007, 11:07 PM   #1 (permalink)
KEVINL
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Dt466 coolant in oil

We have a truck at work new head gasket and top end rebuild 6 months ago. There is coolant in the oil the truck was not overheated so I dont think its the headgasket again. Any ideas? I was thinking maybe the oil cooler.
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Old 10-23-2007, 11:18 PM   #2 (permalink)
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If it's the oil cooler you should be getting oil in the coolant when the engine is running. Then you can get coolant in the oil once the engine is shut off. Could be a cracked or cavitated liner. How many miles? Has the SCA's in the coolant kept in check?
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Old 10-23-2007, 11:36 PM   #3 (permalink)
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We had one do that, kept getting worse, turned out to be corrosion in the liner
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Old 10-24-2007, 12:10 AM   #4 (permalink)
KEVINL
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It has 143,000 miles. It could be a liner but it started yesterday and it is bad. The liner would be more gradual I think. the Overflow tank is empty and the crank case is overfilled from the coolant
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Old 10-24-2007, 12:16 AM   #5 (permalink)
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Just take the oil cooler off and pressure check it in a 5 gallon bucket with 20 lbs of air pressure. Make two plates to cover the mount holes and drill a hole for an air hose end and tap it. Use the gaskets from the block to seal it. Then you know. Cheaper than tearing a motor down and finding nothing.
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Old 10-24-2007, 03:41 PM   #6 (permalink)
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We have had several DT466 engines do that, turns out to be the o ring around the liner. If they get hot just once, it will start dumping water into the base. Someone told me they used to have three o rings on the liner and the newer engines only have one.
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Old 10-24-2007, 04:16 PM   #7 (permalink)
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O-ring around the liner is the most likely cause. I've seen a ton of these do this.
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Old 10-24-2007, 08:46 PM   #8 (permalink)
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ill vote for the liner too. eitehr pitted or the bottom oring
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Old 10-24-2007, 09:07 PM   #9 (permalink)
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Old 10-24-2007, 10:31 PM   #10 (permalink)
KEVINL
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Ouch!

We are going to pull the oil cooler anyways just to make sure before we buy a new engine.

I am really unhappy with International Trucks everybody told us to stay away from the 7.3 trucks but I honestly don't think they could get any worse than the DT466.

We try to only buy Isuzu FTR's now. We have a 93 with over 500,000 miles and it never gives us any problems

Last edited by KEVINL; 10-24-2007 at 10:41 PM.
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