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 03-30-2007, 04:44 Post: 140846
FullPull



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 diesel goes knock knock knock

i just bought a old limegreen yanmar 240d 2 cyl diesel that was left out in the weather for 10 YEARS!! .. i know nothing about diesels... i drained all the fuel and got her to fire right up.... Knock!! Knock!! Knock!!! She Went!!!.. I was so HAPPY Smile... i know these 2cyl diesels knock like hell...but it had no power and NO SMOKE!! .. is it true that bad injectors can cause excecive Knocking?? .. ....... some times it Knocks at idel..some times it knocks at higher RPM ....... when it knocks at a given RPM (FAST OR SLOW) i just speed it up or lower the RPM.. then it sounds OK..(for about one minute).. I HAVE TO ALWAYS ADJUST THE RPM TO AVOID KNOCKING.................. IS IT A ROD??. . . IS IT A INJECTOR OR THEINJUCTOR PUMP??.. . . IS IT THE TIMMING???? . .. ... .. .. ... .. .. .. .. PLEASE HELP!!!!
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 03-30-2007, 10:54 Post: 140861
Art White



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 diesel goes knock knock knock

Risky business here, but to loosen the injector line to the cylinder individually would tell you which cylinder has the trouble. To switch the injectors would tell you if one is the problem as the knock will switch cylinders. You should wear glasses and coveralls when doing this as to loosen the line will have high pressure fuel spraying most everywhere!






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 03-30-2007, 11:02 Post: 140862
Art White



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 diesel goes knock knock knock

Risky business here, but to loosen the injector line to the cylinder individually would tell you which cylinder has the trouble. To switch the injectors would tell you if one is the problem as the knock will switch cylinders. You should wear glasses and coveralls when doing this as to loosen the line will have high pressure fuel spraying most everywhere!






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 03-30-2007, 12:05 Post: 140864
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 diesel goes knock knock knock

Art is on the right track, but I would offer a couple of pointers, and need a little more info. too.

First, it might be easier, and safer, to loosen an injector line, wrap the dickens out of it with rags, then start the beast with some WD-40 or similar NOT ETHER or quick start. This way the fuel is better contained, but it will take longer.

Any chance the previous owner will give you any background? Any information is better than tearing it down for nothing.

If I understand what you are saying, it will knock, after a minute, at any rpm? It's not uncommon for the injectors to leak down, causing air to be trapped behind them, this would make it act strange until it was cleared out. Slacking off each injector line will do this, so will some run time.

IMHO, you should completely drain the fuel system, clean it out well, and refill it with fresh clean diesel, and add a good amount of Power Service. Then drain out the oil, check it carefully for any metal particles or debris, cut open the filter and also check it's contents, then install a new filter and fresh oil. Only then will you have a better idea of what is going on. You might also want to consider taking the pump and injectors to a specialist to have them both checked and cleaned properly.

Best of luck.






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 03-30-2007, 12:59 Post: 140867
FullPull



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 diesel goes knock knock knock

no i can`t get any backgrond or history on the tractor... the owner passed away and his son sold it to me... after turnning it over sevral times bleeding the injector line fitings i fired it up for the first time... wile i was sittng on the tractor my brother grabed a wrench to bleed the lines... as he cracked each line opend the knocking would stop then return a few seconds after tightening the line back up.... then i discoverd by adjusting the RPM i could control the knocking...but then it would start kocking agan..... we ran the loader for about half an hour just to test it out.... it luged down vary easy and knocked like hell under a vary light load..... PS. thanks for the warning.. we didnt know about the dangers in bleading the lines wile it is running... next time i will have him ware eye protction






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 03-30-2007, 13:37 Post: 140868
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 diesel goes knock knock knock

I'm a former Y240 owner, and I'm here to tell you that they KNOCK even when they're running right. It's the nature of two cylinders, and why a lot of folks call them Yamma-Hammers.

But the lack of power isn't right, two cylinders generally have huge amounts of torque.Perhaps you can provide some more specifics if you ignore the noise and concentrate on the power issue.

//greg//






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 03-30-2007, 20:12 Post: 140876
Art White



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 diesel goes knock knock knock

Most all two cylinders do have a knock to them, I guess for your ears only, find one the same model or close and listen to it run. I wasn't thinking of someone not used to how one would sound to begin with. They do normally smooth out under load but do have a distint sound......

Thanks Murf!






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 03-30-2007, 22:18 Post: 140882
FullPull



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 diesel goes knock knock knock

yes first thing i did was to remove the fluids and change the oil filter ther was no metal in the oil.. i have been around diesels quite a bit.. a perkens 6 and a vary loud perkens 4 banger!! the perkens 6 was nice and smooth running with vary little knock.. the perkens 4 banger was a real rattle trap with lots of knock!! i sleeped next to both engines for days at a time on my dads fishing boats..but the knock was more of loud tick.. and it was a constant knock!! this is more of a RANDOM Knock!! it comes and goes at random... it can be doing fine at any given RPM..then it starts to slowly build to a louder knock i chang the RPM and te knock smooths out...then the knock slowely builds up, i change the RPM again and the knock goes away.. if i play it by ear i can run the motor just fine.. could i be a bad injuctor pump?? .. when we bleed the lines it just dirps from the line fittings.. is this normal?? i know about the danger at the end of the injuctors but i didnt think it was dangerus to blead the lines at the injuctors... i hope i have given enough info...






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 03-31-2007, 00:39 Post: 140885
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 diesel goes knock knock knock

Given that description, you might have a piston slapping. If you're lucky, it just might be a connecting rod that needs tightening on the journal. Before running it again, it might be a good idea to pull the oil pan and grab both conn rods. While you're under there, try to feel if a crank bearing might be going bad too.

I think there's a screen on the oil pump pickup that you might clean while the pan's off too.

Having said that, I'm not sure that a loose conn rod would be responsible for that you describe a that significant power loss. But at this point it's much easier to pull the oil pan than to pull the head.

Do you get the power back when the "knocking" stops?

//greg//






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 04-01-2007, 07:33 Post: 140906
harvey



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 diesel goes knock knock knock

I would take a look at the injectors first and check pressure from pump. Timing is the next thing that I'm ah thinkin.

Never played with those kind so NFI on the timing steps. Some one smarter than me can probably explain how to check on that engine.






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Discussion Boards > Active Subjects > Messages as Posted > Yanmar Tractors Forum

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