New engines on cold startup

[RalphVa]

How many have newer diesel engines, particularly tier 4, who are still getting smoking on cold startup?

My 1025 still smokes and shudders a bit, even a little bit of blue smoke like my 4010 had, on cold startup, and it's not really cold here yet, only down to the mid twenties. Whereas, my Isuzu diesel generator starts with no significant smoke and very smooth, and its operating rpm is near what the 1025's "idle" now is. The 2004 JD 4010 was basically 1980s technology, more or less identical to what our 1983 240D had in the way of glow plugs (time needed, etc.) and little bit of smoking on cold startup but otherwise no smoke. Doesn't seem as though Yanmar has made much progress on these tier 4 engines other than to make the idle speed irritatingly high, AND the engine is not as smooth as before.

Our 2010 VW TDI starts and runs like a gasoline engine. No smoke. There is some odor when it goes through the soot burnoff every so often, when it's doing it while parked in the garage.

Ralph

 

[buickanddeere]

A non issue and worrying over nothing.

 

[corey9212]

How many have newer diesel engines, particularly tier 4, who are still getting smoking on cold startup? My 1025 still smokes and shudders a bit, even a little bit of blue smoke like my 4010 had, on cold startup, and it's not really cold here yet, only down to the mid twenties. Whereas, my Isuzu diesel generator starts with no significant smoke and very smooth, and its operating rpm is near what the 1025's "idle" now is. The 2004 JD 4010 was basically 1980s technology, more or less identical to what our 1983 240D had in the way of glow plugs (time needed, etc.) and little bit of smoking on cold startup but otherwise no smoke. Doesn't seem as though Yanmar has made much progress on these tier 4 engines other than to make the idle speed irritatingly high, AND the engine is not as smooth as before. Our 2010 VW TDI starts and runs like a gasoline engine. No smoke. There is some odor when it goes through the soot burnoff every so often, when it's doing it while parked in the garage. Ralph

Mine does but like buickanddeere said it's not an issue.

 

[ovrszd]

A non issue and worrying over nothing.

It's certainly not a "non issue". Probably isn't something that needs worrying about. But I don't think the OP is worrying, he's just curious.

My M9540 is Tier III. It smokes considerably upon startup and if under heavy load. I have the same curiosity.

I run a JD770G road grader. It's Interim Tier IV. I've never saw it smoke. Upon cold startup it will steam out the exhaust for a minute or so until it warms the system. Beyond the total lack of smoke, what amazes me most is the inside of the exhaust stack is perfectly clean. You can wipe it with your hand and get no soot or smudge on your hand.

The only explanation I can give is the standards might be different for Tier IV engines depending on useage and possibly HP rating??

 

[Katahdin]

Is the Isuzu direct or indirect injection?

 

[DeereMann]

Ralph -

the reason the small diesel guys have not made their engines more "modern" is the EPA Tier IV emissions limits are different depending on engine power. The smaller engines are less strigent because the extra cost of the same emissions control equipment on bigger engines would price them out of the market. Hence the most you see is retarded fuel injection timing and a soot filter. No SCR catlylst & blue goo tank, no EGR, no variable vane turbochargers, piezo multiple-injection fuel injectors, super computer engine control modules, etc. That is why your VW TDI performs like it does, but you paid a lot for it regardless if you realize that. I don't mean to be disrespectful. I work for a major diesel engine manufacturer, so see these types of unrelated comparisons often.

I don't want all that junk on my occasional-use tractor that I don't use for primary transportation. :thumbsup:

 

[RalphVa]

Not sure about the Isuzu. It's 12.5 kw, probably about 18-20 hp, model 3ce1-B6761. Really smooth engine.

Ralph

 

[RalphVa]

Sales person says the smoking on startup is due to enrichment of fuel at startup. Service person who solved the clamp leakage problem says the fast idle is for emissions.

Suspect the small engines won't get a whole lot of engineering applied to them to solve these startup shudder and other things. Some fixes will trickle down.

Ralph

 

[buickanddeere]

Look on the EPA site . Regulations vary for different HP levels and applications