Identify this injector

haligen · Mar 27, 2017

And..... there went the head gasket. [emoji35]Jody said I should be getting almost 40lbs of boost, I checked for leaks, tightened a few minor leaks at the boots, up pipes were clean, and went to relog. Hit 30psi and heard the gasket go. Guess I should have been watching the damn back pressure. [emoji19]

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gnxtc2 · Mar 27, 2017

You sure???? Maybe you blew a boot or an intake. The HG on a 7.3 is pretty hard to blow.

What symptoms do you have?

Billy T.
[email protected]

haligen · Mar 27, 2017

Giant white cloud, reached 230f oil temp as I nursed it into the driveway and coolant sprayed all over the underside of the hood.

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Vader's Fury · Mar 27, 2017

Sounds like you may have blown the radiator.

I would pressure test the system before tearing the motor apart.

haligen · Mar 27, 2017

I'll pressure test everything but the white cloud was coming out of the tailpipe all the way back to my house.

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gnxtc2 · Mar 27, 2017

Or an injector might have not been installed correct or cracked an injector cup on install. I would diagnosis the issue before tearing apart the motor.

Billy T.
[email protected]

sootie · Mar 27, 2017

Pull the intake and check play on the turbo shaft....

haligen · Mar 27, 2017

Just rebuilt turbo with a new wheel

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haligen · Mar 27, 2017

The coolant is black. Injector cup?

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gnxtc2 · Mar 27, 2017

Or oil cooler. Oil pressure is higher than coolant pressure.

Billy T.
[email protected]

DZL JIM · Mar 28, 2017

Pull the injectors and add shop air to the degas bottle to around 15 psi or so (have a helper wrap a rag around a blow gun and press tight to the bottle opening) and watch in each injector bore. If you don't see any coolant or hear any hissing then it's not the sleeves.

But I can't believe a head gasket would blow at 30 psi. I had my stock head bolts/gaskets hold several runs over 50 psi.

haligen · Mar 28, 2017

Ran a compression test. All but one cylinder was between 300-320 with a cheapy harbor freight gauge. Oil pan level is way up and degas bottle is empty. Pulled the injector from the cylinder with zero compression and it looked like the cup was full of coolant. Could have just been the oil/coolant mix from pulling the injector since I didnt drain the rails. Cracked cup pour coolant into the pan?

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haligen · Mar 28, 2017

Shop air in the degas comes pouring out the injector open that had no compression

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haligen · Mar 28, 2017

Pulled the cup. No cracks and was in the head quite firmly.

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Bobs 7.3 · Mar 28, 2017

Cracked block, cracked head or blown head gasket. Cracked head ive never saw before on a 7.3 but ive heard they can crack inside. Cracked cylinder wall.

Bobs 7.3 · Mar 28, 2017

I just dealt with the cracked cup problem and fuel in the coolant no oil in the coolant.

oldschool · Mar 28, 2017

that looks like a Cat part number

haligen · Apr 2, 2017

While I wait on Riffraff to get my studs here, curiosity got the better of me. I disassembled one of the injectors to take some measurements. The piston is 29.7 or so, plunger is 7mm, and the nozzle is marked with 7-16 F6. I'm not sure what the nozzle markings are but I'm pretty sure the short piston and larger plunger makes a 238? hybrid.

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