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.  

 

 

 

Same knock warm and cold?  Does it change when loaded or does it just knock all the time?  

100% consistent or intermittent at all?

Sounds like a diesel, lol. Just kidding. Maybe injector?

Sounds like a diesel, lol. Just kidding. Maybe injector?

 

That would be easy to find,  just loosen the line to each injector individually til it stops knocking.

Same knock warm and cold?  Does it change when loaded or does it just knock all the time?  

Same from dead cold to warmed up.

 

100% consistent or intermittent at all?

Consistent as can be.

 

Sounds like a diesel, lol. Just kidding. Maybe injector?

HAHA It is not. It was there on the old injectors also.

That would be easy to find,  just loosen the line to each injector individually til it stops knocking.

Not injector related I am certain of that.

Maybe it is because I am on my laptop, but it sounds exactly the same as my truck haha.

Maybe it is because I am on my laptop, but it sounds exactly the same as my truck haha.

How many miles on your rig?

Sounds like my 02 did for the 135K miles I put on it B4 selling it.

Maybe it is because I am on my laptop, but it sounds exactly the same as my truck haha.

That's what I though, mine sounds about same. Maybe in person a guy cold tell the difference.

Somewhere north of 250-260k prob.  The odo/ speedo didn't work for quite a long time haha.

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.

Somewhere north of 250-260k prob. The odo/ speedo didn't work for quite a long time haha.

I'm in the same boat. No odd wear metals in the engine oil so that rules out the possibility of a bearing, rod, or wrist pin.

That's what I though, mine sounds about same. Maybe in person a guy cold tell the difference.

Its a knock. I've seen too many VP44 injected 24 valve trucks nearly as smooth as early common rails.

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.

Its on the rear of the engine between cylinder 6 and the bell housing. I'm fairly certain I will eventually need to pull the transmission to be sure. If I go that far I hope to have enough money to go through with a rebuild. My problem is I have no place to do it.

I've pulled transmission and installed transmission laying in the dirt what wrong with that?

I've pulled transmission and installed transmission laying in the dirt what wrong with that?

Haha not the transmission. I would want to do an engine overhaul but in a shop not in my upstairs apartment.

Edited October 1, 20159 yr by Vais01

We yeah doing a overhaul of a engine on the kitchen table is not exactly my cup of tea either. What stops you from pulling the transmission down and checking the flexplate?

That might be a bit iffy. 

We yeah doing a overhaul of a engine on the kitchen table is not exactly my cup of tea either. What stops you from pulling the transmission down and checking the flexplate?

A jack and some time honestly. Also I live in apartments.

Edited October 1, 20159 yr by Vais01