White Smoke Under Load - Kioti LB1914

TugBarge · Aug 24, 2022

Hi all,

A friend of mine has a Kioti LB1914 and I was over helping him today.

He had a valve collet fail - he put new collets in it, and re adjusted valves, and it's running better now.

However, it's blowing white smoke under load. I tired to attach video, that didn't work, so I frame grabbed. It smokes a bit while operating, but under load it's very evident. It's possible a valve seal is leaking a bit of oil during operation, but this smoke under load is very white.

It's very quick to appear and disappear as you add and reduce throttle.

Any ideas? Seems like injector to me. But I'm a lousy mechanic.

Thanks for any help!

Roadworthy · Aug 25, 2022

White smoke is a possible indicator of water entering the cylinder. If the head was removed to replace the valve collets it's possible the head was not torqued properly. Hopefully the head gasket was replace if the head was removed.

nyone · Aug 25, 2022

That looks more like oil smoke to me.

TugBarge · Aug 25, 2022

Roadworthy said:
White smoke is a possible indicator of water entering the cylinder. If the head was removed to replace the valve collets it's possible the head was not torqued properly. Hopefully the head gasket was replace if the head was removed.

Good idea. However the head was not removed.

TugBarge · Aug 25, 2022

nyone said:
That looks more like oil smoke to me.

The video shows it's pretty white. If I can figure out how to attach it. Perhaps there is a mix of oil and fuel? Not sure

M59 · Aug 25, 2022

TugBarge,

Place a small mirror or sheet of glass in the freezer until it is very cold and then immediately place it in front of the exhaust to get "smoke" to condense on the glass. If water then it will condense but not be oily. If water then you have a leak from water coolant system into the combustion cylinder. If oily then you either have unburnt diesel ( soot ) or oil from lubrication system.

TugBarge · Aug 25, 2022

M59 said:
TugBarge,

Place a small mirror or sheet of glass in the freezer until it is very cold and then immediately place it in front of the exhaust to get "smoke" to condense on the glass. If water then it will condense but not be oily. If water then you have a leak from water coolant system into the combustion cylinder. If oily then you either have unburnt diesel ( soot ) or oil from lubrication system.

Great idea! I will try this tonight. Thank you.

ROUSTABOUT · Aug 25, 2022

Could be a simple as stem cup seals.

TugBarge · Aug 25, 2022

ROUSTABOUT said:
Could be a simple as stem cup seals.

I ordered some through work - they are inexpensive so hopefully we can get those on soon.

rScotty · Aug 25, 2022

TugBarge said:
Hi all,

A friend of mine has a Kioti LB1914 and I was over helping him today.

He had a valve collet fail - he put new collets in it, and re adjusted valves, and it's running better now.

However, it's blowing white smoke under load. I tired to attach video, that didn't work, so I frame grabbed. It smokes a bit while operating, but under load it's very evident. It's possible a valve seal is leaking a bit of oil during operation, but this smoke under load is very white.

It's very quick to appear and disappear as you add and reduce throttle.

Any ideas? Seems like injector to me. But I'm a lousy mechanic.

Thanks for any help!

OK, to me that looks like the white smoke that happens with unburned diesel being pushed out the exhaust. Usually from a cylinder that isn't igniting. Typical of cold weather starts. White smoke that smells strongly of diesel is sometimes called "diesel fog".

If that is what it is, it could be injectors, but just as likely - given the history of a valve problem - it is compression related. One good diagnostic step would be to do a compression check. You can do that when you pull the injectors to check them.

BTW, you call that part a "collet"? I've always heard "keepers" and had to look up the term "valve collet".
But regardless whether we call it a collet or keeper, I was a mechanic for a long time and don't think I can ever recall seeing that part failing on anything.

Can you tell some more about the failed collet? Had he taken the head off and done a valve job? How does one replace the collet without taking off the head? How did he know it had failed? Did the valve fall down? Lots of questions...

rScotty