7.3 oil in radiator overflow tank - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 8 (permalink) Old 06-15-2017, 09:45 PM Thread Starter
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7.3 oil in radiator overflow tank

I have oil in my radiator overflow tank I'm mean full of oil but no water in the oil is this the orings on the oil cooler. It's a 97 f350


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post #2 of 8 (permalink) Old 06-15-2017, 10:22 PM
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Re: 7.3 oil in radiator overflow tank

Most likely yes its an oil cooler issue either orings or the cooler its self failed internally

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post #3 of 8 (permalink) Old 06-15-2017, 10:35 PM
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Re: 7.3 oil in radiator overflow tank

Yeah when I started my rebuild I had started seeing some oil in coolant and when I pulled my cooler there was a piece out of the one of the orings.

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Upgrades:
|Bellowed UpPipes|160CC Injectors|Adrenaline HPOP|Rebuilt Turbo 360 Bearing|Custom E-Fuel|Manual to Auto Conversion
|Delete Pedestal|3" Down Pipe 4" Exhaust|Dual Tensioner and Belt|Stainless Steel HPX Crossover|Custom Banks InterCooler
|42 Gal Rear Tank 35 Gal Front Tank |DP Infinity Tuner
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post #4 of 8 (permalink) Old 06-15-2017, 10:36 PM Thread Starter
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Re: 7.3 oil in radiator overflow tank

Ok then that's not to bad.


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post #5 of 8 (permalink) Old 06-19-2017, 05:42 AM
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Re: 7.3 oil in radiator overflow tank

When I had the same issue, it was the gasket between the block and the oil cooler front housing.
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post #6 of 8 (permalink) Old 06-22-2017, 01:16 AM
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Re: 7.3 oil in radiator overflow tank

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Originally Posted by dodgehem04 View Post
Ok then that's not to bad.


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No but it takes a bit of work to drain the coolant, oil , remove the cooler, inspect and replace the o-rings/gaskets, reassemble and flush. I just did mine and went ahead and replaced the water pump while I had the coolant drained. I got my cooler and parts here: DieselOrings
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post #7 of 8 (permalink) Old 06-22-2017, 01:35 PM
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Re: 7.3 oil in radiator overflow tank

do NOT use Dorman gaskets or rings here get the good stuff from DieselOrings, Riff Raff, Ford, Alliant, somebody just don't use Dorman

Good time to change thermostat and waterpump, also fan clutch if needed = $$$$ but very worth while upgrades
I also took the opportunity to change out my block heater while I had the cooler apart
Very straight forward job on the 7.3 = Hooray!

1997 CCFB 7.3, ZF5, 4x4, 4.10, baby swamps, TS6, E99 spyder, RiffRaff pipes, 6.0 FMIC, RSK, 315 toyo at
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post #8 of 8 (permalink) Old 06-23-2017, 12:33 AM
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Re: 7.3 oil in radiator overflow tank

Don't forget to pull the block drain plugs when you do the flush. One is right there near the rear of the oil cooler, the other is on the passenger side just above the starter. If you can't or don't remove them when you drain the coolant, it will seem like you never get all the oil flushed out of the system.......and I agree, never buy the Dorman (Dormant) stuff. There's very little difference in price between them and the original Ford parts, it's just not worth the risk most of the time......
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