Bottom-end eng. knock?

[Bluebird]

I'm quickly approaching 200K. Just chagedthe oil and when I checked the drain plug for leaks I noticed a ping-type of knock toward the back of the engine. I know noises are hard to define on the Internet, but has anyone had a lower end knock? What would it sound like. Or, is this normal diesel noise? I don't hear it in the cab, and no, I have not listened at different engine speed under the truck yet Thanks for any replys guys... Have a great Independance Day weekend, be safe. Patrick.

 

[1stgen4evr]

200k miles and ping

The rods won't be the source of a ping. 200k miles is just broken in all thing being equal. There are more things that make noise on the engines than the rods but a rod bearing going out will allow the piston to slap the head and the noise is quite noticable. I had an engine that was making excessive noise and the cause was a galded piston on number six hole. It had extreme blowby as well. If you don't have any blowby at the crankcase vent, the pistons and bores are good. You have some numbers in your signature line that suggest some tweaks. You might have the timing a half a hair too much on the high side. Or maybe you never listened to the engine from the bottom side before and heard something that really isn't anything other than the dependable Cummins doing its thing.



By the way, the engine with the bad no 6 cylinder was still pulling and cranking like nothing was wrong. These are really tough engines.



James

 

[JFaughn]

I like to use a stethascope to look for noises , but sounds to me like you should check the flex plate for cracks.

 

[Reb.B]

95% posative its your flexplate. I've done 5 of those first gens with broken flexplates

 

[paccool]

Yep on the flex plate. Mine started out sounding like a heavy rocker arm rattle and got deeper in just few miles. Was really knocking and banging by the time I got it home. The center of the flex plate was completly busted out, only because of the little clearance around it did it stay in place.



Hope this is your problem and not something internal in the engine!

 

[Bluebird]

Just noise...

I'm gonna hope that it is what "1stgen4ever" stated, that it is just the CTD doing it's thing. I'll keep an ear to her flexplate and crankcase. I do have blowby, but from a previous it doesn't seem bad. I'll look up some local members and give them an earfull. She continues to run great... Thanks a-million guys for the relpys. I can always count on this forum Oo. Read y'all in cyberspace :-laf Patrick.