Do All Their Engines Rattle?

[Username Taken]

What do you think it is? Piston slap?

I just watched a video and the engine sounded kinda rough. You can't tell in a video but it made me want to open the hood and look for loose shields or something.

Then I read in the remarks that they all rattle like that, even the Kioti. If that is so, is it piston slap? That's a llot of piston slap if it is.

 

[sd455dan]

edit:

We have a Bobcat T250 in the family and it is smooth and quiet- It has a few thousand hour kubota in it another Bobcat in the family a 70 HP mini excavator was a rental machine before bought at auction-but actually built by komatsu also smooth with over 5000 hours on the engine and virtually no low speed or idle knock.

I thought you were asking about their Bobcat (skid steers) Sorry

After watching the video

yeah the new Kioti (Daedong) powered Bobcat tractor sounds like the ones we test drove last year at the Kioti dealer

 

[Username Taken]

The engines in the new Bob Tractors are Daedong, same as Kioti. It sounded pretty ratty when he started it. Commenters were saying it was normal.

If that's normal......... I don't know what to think. I'm wondering if it isn't some of the Loader Stand slapping around a little bit. I could live with that, I'd just tie it off or bungee cord it. If it's piston slap...... Not so sure.

 

[ptsg]

Would you care to share the video with us so we can have a better idea of the sound/rattle in question?

 

[Username Taken]

 

[Username Taken]

"That engine clatter is typical for the small Daedong engines (at least the ones i've owned) . Not sure why. Seems to quiet down a little when warm but not much. Didnt seem to hurt engine life of mine but sure was hard on the ears. Always made me wonder. Owned a 30 hp and a 35 hp and both sounded just like the one in this video."

From the comments section.

 

[ptsg]

Sounds normal to me on a cold diesel engine, however the mic does pick a lot of the noise and makes it sound worse.

Mine does it too but not that much, although I don't really go past 1500 RPMs without the temp gauge start climbing, but mine is a gear tractor, so it doesn't need all the RPMs in the world to keep the HST happy. It goes away once the engine gets up to temp.

 

[obscureflora]

Mine doesn't rattle, knock or click or anything like that.

 

[AZShawn]

My ROPS pins rattle louder than the engine! Haven't bothered to shim them tight yet. Engine really only rattles for a few seconds after startup when cold.

 

[Midniteoyl]

Mine doesn't sound like that in person. Pretty quite to tell the truth. 35hp though.

 

[Patches]

I was told that it's the engine design that creates the knock/rattle. The fuel is injected into a "pre-combustion chamber" in the cylinder head as opposed to directly into the cylinders as typically done in other designs. Why that produces the noise, I've no idea

 

[sklunk]

My son bought a new 2020 CT2025 and the engine doesn't rattle at all. The only noise on the entire unit comes from the ROPS pins and mostly from the bucket level indicator. He hasn't gotten around to shimming either of them to quiet it down.

He is the Parts Manager for the local Bobcat dealership. He did a lot of research and talking to the salesmen and technicians before he made the purchase. They all had good things to say about the 2000-series and up (stay away from the 1000-series; those are junk!) These are still made by Kioti but are night-and-day over the "original" ones that were released a few years ago.

 

[Doughknob]

My ROPS pins rattle louder than the engine! Haven't bothered to shim them tight yet. Engine really only rattles for a few seconds after startup when cold.

YES! Same here!

 

[fasttruck860]

The only time my 2040 rattles like that is when I'm going up a very steep switchback section in my backyard. It happens for about 3 seconds and smooths out as I come over the top.