7.3 knock

[JC4440]

Hey guys long time reader . Always wanted a idi I don’t know a whole lot about them thought . I bought a 1993 7.3 turbo diesel not running . Finally got it running and it has a very low knock that gets louder as it warms up . There’s definitely blowby but idk what’s a normal amout for these engines . I have a video of it running just no idea how to post it . It idles with white smoke . It bellows out black soot when you rev it up . What are the odds it’s only an injector are burnt valve verses blown piston it sounds like the knocks up top

 

[Trevtron]

Knock might be a bad injector or 2, does it sound like it’s missing if you rev it up some?

 

[Thewespaul]

Haha Trevor you sure know about that injector knock now!

Try loosing one injection line at a time till fuel starts seeping out and see if you can find any change in the knock. If you do it’s an injector that’s your issue

 

[pelky350]

Injectors make a knock sound when stuck or bad or non working, I forgot to tighten one of mine and i thought I blew up my engine lol

 

[Macrobb]

Knocking + white smoke? Time for a new set of injectors, then you'll need to re-time the engine(usually advance it due to the higher pop-pressure of the new injectors).