I have a buddy who has a 93 1/2 with the non turbo 7.3; 129,000 miles. Auto trans. His wife drove it to the store and when she cranked it up, it began to knock.
It has good oil psi and they run good fuel.

They had it towed in and a shade tree guy says it may be the flywheel.
Has anyone ever had this issue?
Could it be a rod?
Anyone?????
Thanks

 

wut the heck would the flywheel have to do with an engine knock

 

Don't let the wife drive it....

 

injecter going bad

 

wut the heck would the flywheel have to do with an engine knock ???
That is what I was thinking, but I have heard of flywheels or flex plates going bad.
So, instead of pulling heads and all that junk, I wanted to see if anyone had another opinion.
I always thought the old 7.3 had a very good bottom end?

Bad injector: How can we check or determine?

 

when truck is runing crack open the line to the injector one at a time and c if the sound gets better

 

If the flywheel is a dual mass flywheel then it could be it knocking. The dual mass flywheels have springs that dampen the power strokes of diesel since diesels produce much more intense spikes of power then a gas. When the springs get stretched then there becomes too much play in between the parts of the flywheel, then the parts of the flywheel beat at each other producing a knock.

 

Says auto tranny right in the first post.

But it would not be the first time someone has posted about a broken flex plate.

And an injector sticking open could also be the culprit.

 

I had a ford falcon years ago that started knocking and as I was in the Air Force, didn't have the money to get it fixed. I was talking to a guy that needed an old beater and he offered me I forget how much money. Needless to say I sold it right then. A few months later I happened to see him and he said the flywheel was broken and that's what was knocking. REplaced the flywheel and that fixed it.

 

I agree it could be a flext plate issue. First I would check that the flexplate/torque converter bolts were tight. I have seen countless gassers and diesels just for no apparent reason the bolts would back off slightly just enough that the flexplate would rock back and forth hitting the bolts and producing what genuinly sounds like an internal engine knock. If those are tight get you a small light and check to see if you have any cracks on the flex plate near the crank bolts. A lot of vehicles are notorious for doing it and producing the same sound. It may be a little difficult to be 100% sure it is crack free being you aren't looking dead horizontal at it. If it is neither of those then I would move to the engine and work it out systematically narrowing it down before I would condemn my motor.

 

True about those DMF, mine knocks when you turn th engine off, knocks really loud too.