diesel leaking into radiator - Diesel Forum - TheDieselStop.com
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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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Old 01-04-2007, 12:20 AM   #1 (permalink)
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diesel leaking into radiator

Here is something very strange,there is a fuel leak somewhere but my mechanic cannot find where it is comming from,but there is a very strong smell of diesel fuel in my antifreeze resevoire,has anyone come across this before, any reponse would be grateful.Thanks
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Old 01-04-2007, 12:31 AM   #2 (permalink)
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Re: diesel leaking into radiator

There are very limited possibilities:

1) cracked head allowing the internal fuel passage to communicate with the cooling system

2) leaking injector cup (loose, corroded, some combination of the two) allowing the fuel system to communicate with the cooling system.

#2 is the most likely.
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Old 01-04-2007, 01:17 AM   #3 (permalink)
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Re: diesel leaking into radiator

Green coolant? have you been using your additive?
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Old 01-04-2007, 05:54 AM   #4 (permalink)
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Re: diesel leaking into radiator

Hmmmm... not sure of the age of your truck, but if you haven't kept the SCA levels up, you may be experiencing the results of upper cylinder wall cavitation. [img]/ubbthreads/images/graemlins/phoney.gif[/img] [img]/ubbthreads/images/graemlins/vomit.gif[/img]
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Old 01-04-2007, 07:50 AM   #5 (permalink)
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Re: diesel leaking into radiator

[ QUOTE ]
Hmmmm... not sure of the age of your truck, but if you haven't kept the SCA levels up, you may be experiencing the results of upper cylinder wall cavitation. [img]/ubbthreads/images/graemlins/phoney.gif[/img] [img]/ubbthreads/images/graemlins/vomit.gif[/img]

[/ QUOTE ]
While this is a distinct possiblity, I have never HEARD of one doing this. (I KNOW it is possible, but I go with the above poster as the Injector cup being the MUCH more distinct possiblity) And lets hope it's so, a new injector cup, is much less costly than a block or sleeved cylinder,,,
Anyone know how many miles or how long it takes for the cavitation to eat thru a cylinder wall?
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Old 01-04-2007, 01:07 PM   #6 (permalink)
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Re: diesel leaking into radiator

The cavitation levels our trucks see are so low (really!) that it's EXCEPTIONALLY unlikely that you'd erode the bore boss in the block enough to get perforation in the lifetime of the truck.

Furthermore, any combustion gases going into the cooling system wouldn't produce a raw diesel trace, and would in fact push coolant out of the cooling system as the combustion pressures are a LOT higher than cooling system pressures.
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