My 89 Yanmar 2GM20 puts out a considerable amount of smoke when I first start it up. The exhust put out black soot and a bit of raw fuel at start-up as well. Other than this the engine runs fine. The guy at the local Yanmar engine service center tells me it is the injectors and high pressure fuel pump. For a whooping $800.00 dollars they will send these parts out to be rebuilt. My first question is could it possibly be something else that I can eliminate before I forego the big bucks(i.e., mixing elbow)? Secondly, If I do need to have these parts rebuilt, does anybody out there have a reliable source to get this work done? I got to wonder what the mark up is to simply send these parts out to someone else to rebuild. As always thanks for the help.
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Wow JJ.
Have seen alot of info in the archives on this problem. Sounds like mixing elbow to me, but maybe more because of the raw fuel. Have you heard of Torrensen marine over here on my side of the State? ( Muskegon ) They do exceptional work( best in the Lakes IMO). Contact them at WWW.Torrensen.com and discuss your problem. To the rest of the room, does this sound right? Hope this helps. Pray for Wind, Lugeman
Have seen alot of info in the archives on this problem. Sounds like mixing elbow to me, but maybe more because of the raw fuel. Have you heard of Torrensen marine over here on my side of the State? ( Muskegon ) They do exceptional work( best in the Lakes IMO). Contact them at WWW.Torrensen.com and discuss your problem. To the rest of the room, does this sound right? Hope this helps. Pray for Wind, Lugeman
Startron
I would try a bottle of Startron first, it really helped my engine to be nearly smokeless! Here is a link to that page of our site: http://shop.sailboatowners.com/detail.htm?fno=400&group=720 Dave Groshong Customer Service SailboatOwners.com
I would try a bottle of Startron first, it really helped my engine to be nearly smokeless! Here is a link to that page of our site: http://shop.sailboatowners.com/detail.htm?fno=400&group=720 Dave Groshong Customer Service SailboatOwners.com
Injector service
JJ - If the price you were quoted includes the labor to remove & replace the injectors & pump & get the engine running properly when the rebuilt parts are installed, it doesn't sound excessive. I pulled my single injector myself, took it to a shop that specializes in diesel injection systems for rebuild, & installed it myself & the bill was c. $ 75.00 for the shop work alone. That did not include the injection pump, as I didn't need to touch it. If the $ 800 figure does not include the above labor, it seems a little steep. I think that if you pull the pump & have it rebuilt you may have to get involved in timing the thing when it's re-installed: you may be able to handle this yourself, but probably should have a factory service manual on hand for reference.
JJ - If the price you were quoted includes the labor to remove & replace the injectors & pump & get the engine running properly when the rebuilt parts are installed, it doesn't sound excessive. I pulled my single injector myself, took it to a shop that specializes in diesel injection systems for rebuild, & installed it myself & the bill was c. $ 75.00 for the shop work alone. That did not include the injection pump, as I didn't need to touch it. If the $ 800 figure does not include the above labor, it seems a little steep. I think that if you pull the pump & have it rebuilt you may have to get involved in timing the thing when it's re-installed: you may be able to handle this yourself, but probably should have a factory service manual on hand for reference.
Injectors maybe but not the mixing elbow
It seems if a person says their Yanmar sputters there is always a comment that its the mixing elbow! That problem is overrated! My bet is that if you would rebuild the injectors like TT recommends (@$75 each), you won't have a new engine but it will be much improved. See, injectors allow pressure to build up to a certain range and then "break" or spray. As they age they start breaking too soon (under less pressure) and overfuel the engine. The result of overfueling is exacerbated by a cold engine. Injectors will get looser and looser. Dirty fuel with microscopic grit can score the injector parts causing this sooner than expected. As I recall, Yanmar injectors should break at about 2000psi. New nozzles on your old injectors after a good cleaning will vastly improve you efficiency and performance. (By the way, when you pull the injectors, the diesel shop can benchtest them. If they are breaking properly (at recommended psi in a uniform pattern) then its not the injector and could be the diesel pump. And like injectors, pump failures are frequently caused by forcing bad fuel (dirty, waterey, or under oiled) through the pump. If its the mixing elbow, I owe you and Lugeman a round of drinks.
It seems if a person says their Yanmar sputters there is always a comment that its the mixing elbow! That problem is overrated! My bet is that if you would rebuild the injectors like TT recommends (@$75 each), you won't have a new engine but it will be much improved. See, injectors allow pressure to build up to a certain range and then "break" or spray. As they age they start breaking too soon (under less pressure) and overfuel the engine. The result of overfueling is exacerbated by a cold engine. Injectors will get looser and looser. Dirty fuel with microscopic grit can score the injector parts causing this sooner than expected. As I recall, Yanmar injectors should break at about 2000psi. New nozzles on your old injectors after a good cleaning will vastly improve you efficiency and performance. (By the way, when you pull the injectors, the diesel shop can benchtest them. If they are breaking properly (at recommended psi in a uniform pattern) then its not the injector and could be the diesel pump. And like injectors, pump failures are frequently caused by forcing bad fuel (dirty, waterey, or under oiled) through the pump. If its the mixing elbow, I owe you and Lugeman a round of drinks.
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