Well gents I have put over 30,000 miles on this truck since I purchased it and I have had an interesting knocking noise. It is beginning to bug me so I plan on finding whats causing it. 

 

I have been told cracked flexplate, loose converter bolts (checked a few days ago all tight), loose flexplate bolts on the crank and even cracked pistons. 

The engine has over a quarter million miles and there is some mild blow-by (within spec) and oil analysis shows low wear metals. 

The transmission is built and the converter is custom (triple disk billet). Injectors are currently 4% balanced and of course the wrong VP44  .

 

Any ideas please let me know. I would prefer to not pull the transmission if I can help it.

 

I stole this video from YouTube that perfectly shows the exact same sound.  

 

 

 

That might be a bit iffy. 

Agreed. I am not so sure that the floor could support 1200 lb of iron.

Well the best I can say is hit a shop that can do the work...

Well the best I can say is hit a shop that can do the work...

Not many are qualified to do the work. Quite a bit of them don't even touch a torque wrench or know it has to be certified every so often. I do know a great place but it will cost me.

Edited October 1, 20159 yr by Vais01

Mike any idea if the truck will throw a check engine light for cranking up without a transmission?

There are two options... 

 

1.  This is America, when it doesn't run right, we thrash the hell out of it!  

 

2.  Be like TFaoro, and do a wonderful awesome rebuild that the rest of us envy!

 

 

Realistically, I might try a stethoscope, a bore scope to look at the flex plate closer if you can borrow one... try to isolate the knock more.

Well thanks for making my night! I did the first one then the second one haha!

 

These engines don't run smooth as silk.... Trust me over 7 thousand dollars later mine still does not run smooth as silk!

 

I'd check the flex plate... if that's good run it! If something was majorly wrong it would show up in the analysis.

Well thanks for making my night! I did the first one then the second one haha!

 

These engines don't run smooth as silk.... Trust me over 7 thousand dollars later mine still does not run smooth as silk!

 

I'd check the flex plate... if that's good run it! If something was majorly wrong it would show up in the analysis.

Nothing in the oil that would cause a stir. Now smooth as silk is my rifle but not my engines.

 

Having said that the distinct knock almost reminds me of a CAT 3116 with an improperly adjusted fuel rack.

 

Now I can say that over 2100 RPM the knock vanishes. I wounder if the timing key on the VP44 shaft can be swapped for another. 

I bet money you'd never notice the difference between two keys.... Heck guys have jumped teeth on the gear to try and gain timing. It didn't even make the truck run funny.

I bet money you'd never notice the difference between two keys.... Heck guys have jumped teeth on the gear to try and gain timing. It didn't even make the truck run funny.

You know, I seem to remember a video you made with the injection pump timing plunger sticking. I bet its pretty close to that noise. I wonder if I have a sticky delivery valve or plunger on the rotor.

Edited October 1, 20159 yr by Vais01

Mike made that..... I though the same thing. Swapped vp's and no difference. Too bad you aren't in CO I'd let you listen to an angry motor!

Mike made that..... I though the same thing. Swapped vp's and no difference. Too bad you aren't in CO I'd let you listen to an angry motor!

I may make the trip one day up to a military base my brother (very close friend) is in. It is not to far from you.

Ft. Carson?

Ft. Carson?

Sounds about right.

Come on up! 

Come on up! 

I will let you know when I do.

Yep, couple of us here.  

Yep, couple of us here.  

We would have to try and set up a mini meet.

What did it turn out to be? I have the same problem, a loud knock. Three out of five people told me "its the injectors" after changing injectors knock still there.