2001 7.3 Oil in Coolant, Coolant in Oil - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 3 (permalink) Old 06-03-2012, 10:48 PM Thread Starter
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2001 7.3 Oil in Coolant, Coolant in Oil

Hello All,
I rebuilt my engine last year and have put roughly 10k miles on it at this point. Over the winter the icp O-ring blew and was leaking in a similar fashion to the HP System End Plugs. So in the giant puddle of oil on the ground I noticed little red drops of coolant. Ever since the rebuild I had not noticed any oil in the degas bottle, but now with a closer look there is some residue.
Over the course of time I had been driving the truck I noticed really no coolant loss or raise in oil level during service intervals

So.. What could this mean from my research I found a few things.

Oil Cooler O-rings- Replaced during rebuild (Ford)
Oil Cooler- Was cleaned but not replaced
Injector Cups- All 8 replaced by machine shop and flow tested (Dorman)
Head Gasket- Heads were cut, and put back in with studs not bolts(Victor-Reinz HG)
Front engine cover- Checked for plumb, was straight no cavitation noticed on housing(Victor Reinz Gaskets)
Injector O-ring- Stock cores rebuild to 238 cc, installed with new o-rings

Given what others have said the cooler is the first place to look, I just took out a faulty injector so While things were removed I took the cooler off to inspect it again. I was just going to replace it but for 240 dollars I am just going to assume it may be a waste of time and money, given my luck I am probably just going to have to look at the heads or the cups....

Any info or help would be appreciated kinda at a wall here with what to do, given each system is contaminated.
Thanks Everyone,
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post #2 of 3 (permalink) Old 06-04-2012, 11:40 PM
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Depending on how well the cooler was cleaned there could still be residue that would eventually make it to the bottle. You could do a coolant system pressure check.

2002 F-350 CC Shortbed, Rebuilt 7.3 Powerstroke, 200K, head studs, Adrenalin HPOP, DIY BHAF, EBV brake mod, New motor, New trans both @ 170K, 4" Lift, 35" BFG KM2, GEAR HEAD 6 Position, Banks Big Head Wastegate, 4" Duals, Superlift Air Bags, B&W Hide a ball W/ 5th Wheel Companion, Marinco mod, '15 steps,'12 tailgate,'15 mirrors,'12 seat belts and jump seat. no more lap belts

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post #3 of 3 (permalink) Old 06-06-2012, 08:40 AM
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If you actually have new coolant in the oil, and not just leftover from previous repairs, then the most likely culprit is the mating surface between the engine oil cooler and the engine. IOW, a leaking gasket, similar to a leaking head gasket.

If that's the problem, then the fix is to drain the coolant, remove the engine oil cooler, clean it up squeeky clean, then install it right with a new gasket and the correct torque.

I wouldn't worry about oil in the coolant. That won't hurt anything other than act as a warning that you may have coolant in the oil. But even a small amount of coolant in the motor oil can ruin the engine in a heartbeat.

My Sierra Blanca in the sig pic was a great pickup for 11.5 years. I sold it a coupla years ago. I drove a hand-me-down 2003 F-150 SuperCrew 4.6L 2V for a while, but it was unacceptable for towing more than a rowboat. Replacement is a 2012 F-150 EcoBoost SuperCrew Lariat that tows my 5,000-pound TT like a dream.
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