My CK20 Manual Transmission

unkajed · May 11, 2008

My tractor now has 25 hours on it. Since day one, I have heard a knock. Perhaps I am not use to a diesel engine. I don't know.

Basically:
I turn on the ignition switch to glow plug. The glow plugs stay on for about 8 seconds or so. Glow plug light goes out.

I start the engine: Oil lamp/light goes out and I adjust engine speed to approx 1500 rpms and I let it warm up.

When I start it I hear knock, knock, knock. I hear this sound regardless of load, no load, rpm, transmission engaged or transmission not engaged.

The tractor is not smoking whatsoever.

I can make the knock go away by quickly lowering the rpm's via the throttle lever.

Let's say I am idling the engine around 1500 rpms. I adjust the throttle level all the way down to 1000 rpms which is the minimum rpm and the sound goes away until I guess it starts the injectors again to supply fuel to maintain the minimum rpm. Then the sound starts again.

Perhaps I am hearing Ignition Knocking.

Even though I am at 25 hours, I am considering changing the oil in case the tractor set on the lot for a while and perhaps the filter failed, is failing or something. Maybe the factory uses cheap engine oil for initial break in.

I know one thing. When I do change the oil, I am going to run the old oil through a pair of women's hose just to see if I have any metal particles.

If it is ignition knock, what can I do to quiet it down?? Higher centane rating?

It has not failed but it defintley sounds different than a gasoline engine.

I called my dealer and basically he said don't worry about it unless it fails.

Any suggestions or comments???

PAB_OH · May 11, 2008

It's probably just diesel knock but that is a diagnosis from xxx miles away without listening to the machine. Take it for what it's worth.

I have noticed the Daedong engines are MUCH louder than some others. My previous tractor was a Kubota and it purred once it warmed up. The 'ol Kioti definitely make more of a racket. I don't mind it really but I was surprised at first.

unkajed · May 11, 2008

PAB_OH said:
It's probably just diesel knock but that is a diagnosis from xxx miles away without listening to the machine. Take it for what it's worth.

I have noticed the Daedong engines are MUCH louder than some others. My previous tractor was a Kubota and it purred once it warmed up. The 'ol Kioti definitely make more of a racket. I don't mind it really but I was surprised at first.

Thanks.. I am thinking the same thing. Especially since you say it is MUCH louder than some others.

Kill the fuel the knocking stops, re-apply the fuel, it starts again. Adjust the rpm downward and it stops.

I know if it was a rod or something, I would hear it all the time. I once has a car with a bad connecting rod bearing and it made noise when I applied gas or not. It never went away.

Maybe I am just freaking out.

Thanks again!.

{I would be pissed tho if something failed on this thing with just 25 hours on it since I bit the bullet and paid it off last month. I know Murphy and his laws.}