LB7: LB7 fuel in coolant, how?

[DPC]

2004 stock lb7 sheared cam pin and bent pushrods nothing new...but the coolant has fuel in it, how could the fuel get to the coolant?? Pressurized the short fuel returns in the heads, no leaks.

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[Chevy1925]

bent valves or something take out an injector and cause it to crack within the head? injectors are surrounded by coolant so if a body cracked in there, i could see it.

 

[DPC]

bent valves or something take out an injector and cause it to crack within the head? injectors are surrounded by coolant so if a body cracked in there, i could see it.

Possibly, they would also have to get past the injector cups also.


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[DPC]

Cups were also stuck on the injectors like compression was getting past the copper washers.


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[DPC]

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[Chevy1925]

sure its fuel and not some mix separating out of the "use in any cooling system" coolant?

 

[DPC]

Set a cap of it on fire to make sure, it’s fuel.


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[Dukchunter]

Injector cup not seated in the head? But of that was the case you would think the coolant system would be over pressurizing and you would be losing coolant

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[DPC]

Heads passed pressure check at the machine shop. New cups and injectors were going in anyways. I'll have it back together in a day or two. I think we will be good. Still have no idea how the fuel got into the coolant.

 

[blk smoke lb7]

I jector sprays fuel 340 psi piston squish could force the fuel past the injector cup in theory.Thats why I make threaded injector cups.