[Austin88f250]

Hows it goin guys back at it agian with my idi i noticed yesterday on my way home my truck started knocking slightly then the smoke started pouring out was blueish white and smelt of raw fuel (injector) i popped the hood the next day after work i let is sit overnight and while i was at work and when i got home i started the truck and started cracking injector lines after doing all but the one driver side farthest in the back not sure what number but the line was glowing red i didnt think nothing of it and went to wipe it off thinking it was rusted well no after losing all fingerprints i know now it is glowing hot what would cause this and could this be the culprit of smoke and knock?

 

[Bill1013]

The copper washer seal has been destroyed. From what your saying, the injector itself had never been torqued down correctly letting combustion escape back up the line. It's possible that the injector nozzle is destroyed. If the injector comes out without the nozzle, take an injector and grind the large threads off, then screw it back into the nozzle, keep turning in the same direction and pulling/prying up. Before doing that if the nozzle is still in, flood the injector opening with PB Blaster to soften the carbon which sure will be there.

 

[Austin88f250]

Ok i swapped injector got copper washer out replaced copper washer put tiny bit of grease on said washer to insure it stayed on during installation also used anti seize on threads runs better but at low throttle it seems to have a slight knock not loud like previous knock from injector but more of a quieter knock with a less hollow sound

 

[oldrebuiltdodge]

Crack the line loose on that injector, and see if the knock goes away.

 

[Austin88f250]

Its only under slight acceleration the knock occurs and goes away quickly iill crack it and try to mimic the acceleration while out side of cab and see if it goes away

 

[Bill1013]

If the knock occurred after changing the injector, then it's that injector causing the knock. IDI diesels are kind of finicky when it comes to injectors.

Did you tighten it down to 37 to 45 ft lbs? Won't cause the Knock, but that is the torque spec. The nozzle has to kind of embed itself into the copper seal.

An injector knock can develop when only one is changed. It can be a leaking injector, or way out of spec compared to the others.

 

[Austin88f250]

Knock went away i drove truck to work today ran great im gonna order all 8 new injectors off line because i cannot find anyone that has my kind of injectors instock only luck i have found is advance had one bwd in stock so i grabbed it and replaced the injector turns out the one was stuck open but now messing with the injectors i have caused fuel to leak in the return lines it never ends ?

 

[Austin88f250]

Also yes i torqued it down to 37

 

[chuckster57]

Get a bag of Viton O rings from McMaster Carr:
P/N 9464K24.111