blue smoke from muffler

[msjanket]

I've got a very low hour Iseki Bolens G152 with the Mitsu K3a diesel. Upon exertion, I get blue smoke. The engine has 390 hours, the engine is at least 25 years old. What are the chances my valve seals are hardened and not making a good seal? Otherwise, it would have to be the rings, right?

thanks

 

[Sutol]

I've got a very low hour Iseki Bolens G152 with the Mitsu K3a diesel. Upon exertion, I get blue smoke. The engine has 390 hours, the engine is at least 25 years old. What are the chances my valve seals are hardened and not making a good seal? Otherwise, it would have to be the rings, right?

thanks

Could be rings but could be valve stem oil seals or even crank case overfilled with oil.

 

[KYErik]

Intake valve stem seals usually leak most under high vacuum conditions (idle) and then a puff of smoke is produced when you rev up the engine. Smoke under load is typically the piston rings- but you can likely buy a lot of oil for what a rebuild would cost.

If the engine was sitting unused for a long period of time before you bought it, give it some time before you rebuild- the oil control rings might just be stuck and it is possible that they will unstick themselves the more you use the tractor.

 

[Soundguy]

does it give a burst of blue upon quick throttle up that goes away? if so that points to a bad valve stem seal.

or does it smoke blue full time?

soundguy

 

[Jerry/MT]

I've got a very low hour Iseki Bolens G152 with the Mitsu K3a diesel. Upon exertion, I get blue smoke. The engine has 390 hours, the engine is at least 25 years old. What are the chances my valve seals are hardened and not making a good seal? Otherwise, it would have to be the rings, right?

thanks

If your getting blue smoke out of your diesel at high power then either the rings are stuck or worn. Worn valve stem seals could also be the problem and they would cause the problem across the power range becaue there is very little vacuum in a diesel since it has no throttle plate like a gas engine.

 

[Soundguy]

depends on how the valve cover is vented too.. but yeah.. more info is needed.

soundguy

 

[msjanket]

The engine ejects blue smoke noticeably when first heavily throttled from stop. Upon constant exertion, like driving up a hill with a load, there is some blue smoke, not massive, just some. NCW has a kit with all gaskets, rings, crank bearings, etc for around 340 beans. I found a place that had rings alone for 580 bucks with no gaskets or other accoutrements. How do ya like those apples?

The Bolens Iseki is one fine tractor, easily in the Kubota class. The 15HP Mitsu diesel has amazing torque.

 

[Soundguy]

got a diesel comp tester?

 

[banjodunn]

G'day have you got an implement that REALLY loads the tractor up? If so then i suggest you put it on the machine check/top up all fluids and then go and give it 2-3 hours of good HARD work, it sounds to me with the age of the machine and the very low hrs that it could be glazed up bores from light loading. Keep a good eye on the gauges and you should be putting black smoke out the chimeny ( ya know its working then :thumbsup: ). I have had this a few times at work were we have had complaints of rough running/excessive smoke/ poor power and have been able to fix these with a good run on the dyno. A larger than normal implement will do the same thing as the dyno but you have to work it


Jon

 

[john_bud]

quick Q: are you sure it's blue smoke and not black ? Can you smell burning engine oil in the smoke?

Older diesels will smoke black when the gov kicks in and slightly over fuels. Black is ok. At worst, it typically just means the injectors may need to be adjusted or have new nozzles put on.

 

[msjanket]

On the Mitsu diesel, crankcase oil is supposed to add up to 2.7 quarts. Ironically, if I look at the dipstick, it shows 2.7 to be well below so-called ideal volume. Can't figure this one out. Since I have a pan gasket leak, I had to drain it and take off the pan for a new gasket. Just prior, I was running it and "topped it up" according to dipstick level. Due to the bad gasket, I leaked out a half quart into a drain pan. Total volume of leaked oil and remaining oil added up to 4.3 quarts. I wonder if the engine has to be exactly level to show a correct amount in the crankcase.

 

[Hooked_on_HP]

If it is suspose to hold 2.7 and you are putting in 4.3 this is problbly the problem. If you are 100% positive it takes 2.7 change the oil and put the correct amount of oil in . Start thye tractor and let it run fot a few min. to fill the filter. Shut the tractor off and let it sit for about 1/2 hr. remove the dipstick and remark the full mark.
Bill

 

[Haywire]

I wonder if the dipstick is the correct one. A shorter one would have you overfilling it.

 

[Sutol]

What I forgot to mention was...
is the engine reaching operating temperature?

If it runs cold you will get blue smoke