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Knocking?


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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 :stirthepot: .

 

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.   :whistle2:

 

 

 

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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.

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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.

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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.

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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.

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

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

Edited by Vais01
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