Fuel in the Coolant

[RandyH]

in another thread I mentioned I'd had a cracked injector bore that resulted in fuel contaminating the coolant and replugging my year old oil cooler. Thought I'd post a pic of the resulting coolant sludge as it really shows what happens when the two mix and the importance of a good flush afterwards. This was what the thermostat housing looked like.



Out of curiosity, anybody else had a cracked injector bore. Sounds like a not uncommon event but not as common as say the EGR/oil cooler issues.

 

[RandyH]

A few more pics that might be of interest showing the cab off during the head replacement and the second head that was tested with dye penetrant to detect the valve seat micro cracks.

 

[RandyH]

And a really good pic from Accurate Diesel's site showing the common location of the cracks where there is a thin casting wall (black arrow). The stock injector cup (replaced with an extended cup in the pic) is the shorter one shown to the side and the cracks typically happen just above the stock cup height in the bore.

 

[RandyH]

And last is the actual video I took of the injector bore leak when I pressure tested it.

http://vid213.photobucket.com/albums/cc41/randyh1221gj/IMG_1889_zps1css1aso.mp4

 

[troutwest66]

Thanks for sharing. Pray I don't experience that with mine.