Cat 3116 Diesel clunking noise

[Eppic]

There is a clunking noise coming from my recently re-built Cat 3116 diesel. I would have posted a video if possible. As the RPM's ramp up the sound gets less. Motor runs fine and has comparable performance as other motor. The mechanic who did the rebuild and install has not been able to solve the issue. I am hoping I can point him in the right direction.
Thanks
Jody
jepp216@gmail.com

 

[Portofino]

Spun rod bearing .

 

[rafiki_]

What was done with your rebuild? How much was done?

 

[vas]

Spun rod bearing .

Ouch!

 

[Spare Thyme]

Does it start and idle smooth?, could be something simple like incorrect adjusted valve lash, injector timing or bad injector or bad injector seat, setting the injector timing is fiddly even with the CAT tools

 

[Eppic]

here are a couple of Youtube videos of the motor running.

 

[Eppic]

What was done with your rebuild? How much was done?

Just waiting for a detailed report.

 

[Eppic]

Does it start and idle smooth?, could be something simple like incorrect adjusted valve lash, injector timing or bad injector or bad injector seat, setting the injector timing is fiddly even with the CAT tools

Starts great, runs smooth. Equal power to other motor. Idles fine. I have posted a couple of videos.

 

[Spare Thyme]

Sounds mechanical so not a diesel knock, take the valve cover off and run it and see if you can pinpoint the source of the noise, does sound a bit like valve adjustment or valve train related

 

[AllanG]

I agree with @Spare Thyme that it sounds like a valve adjustment problem......so, I’d be checking the tappets clearances and general valves assembly.

 

[Portofino]

You said “ clunking “ that’s a tapping noise .
Whats it had done ? Your engineer or yourself with a stethoscope should be able to pin point the spot / small area .
Use a piece of 10 cm dia pipe to your ear and move it about , start with the valve gear on top of each cylinder , then inlet and exhaust side if one s making the racket .
Then the block up and down each cylinder , and everywhere else , water pump alternator etc etc .
You will find where quickly.

 

[lynallbel]

You said “ clunking “ that’s a tapping noise .
Whats it had done ? Your engineer or yourself with a stethoscope should be able to pin point the spot / small area .
Use a piece of 10 cm dia pipe to your ear and move it about , start with the valve gear on top of each cylinder , then inlet and exhaust side if one s making the racket .
Then the block up and down each cylinder , and everywhere else , water pump alternator etc etc .
You will find where quickly.

10mm

 

[lynallbel]

That sounds like something is hitting a cover/shield internally?

 

[Bilgediver]

There is a clunking noise coming from my recently re-built Cat 3116 diesel. I would have posted a video if possible. As the RPM's ramp up the sound gets less. Motor runs fine and has comparable performance as other motor. The mechanic who did the rebuild and install has not been able to solve the issue. I am hoping I can point him in the right direction.
Thanks
Jody
jepp216@gmail.com

Not as bad as this one but getting there

 

[rafiki_]

Listen to Spare Thyme. He knows his stuff.

 

[Portofino]

Listen to it with a bit of 10:MM hose to your ear .
Put an X marks the spot .Post that pic .