Yanmar L100 AE

[santsalvador]

HI. I'm  new to this forum,I live in Spain and having big problems trying to find a decent mech to help with my L100.
I'm certain I have a govenor problem as when the engine is on load it keeps over reving and droping out, my only way over this is to adjust the throttle manually before it drops out, the generator is running a Trace inverter.
Anyone know how to adjust the govenor on the Yanmar L100.
Regards Terry.

[beambeam]

Hello;
I have a yanmar L90 air cooled.I don't know if the L100 is exactly like mine but it should be close.If you take the bottom nut off the injector pump and remove the little plate and gasket you will see a little window.Open the throttle with the engine off and you will see the pointer on the injection pump move.There is a line marked on the bottom side of this window usually right of the center position.This is the mark they set the governor at the factory.You can check this but be sure to mark where you governor is set before trying this.Don't run the motor while the window is open.It will throw oil out.I'm having problems with mine.I can't get the low speeds.It will either rev or shut down.I have to find a solution for this.I hope this is a help.Good luck.




                                       jim

[santsalvador]

Hi Jim.
Yes Ive tried that,set the throttle lever to on and set the pointer to line up with the scribe mark on the body by adjusting the governor bolt, if I do this it wont start at all until I back it off.
Ive even spoken to Yanmar in the UK about this with no luck.
Its driving me mad.
Terry.

[Startomatic]

if i could offer some help, these are 2 pic of the throttle in relation to the spring hole setting and the below stop adjuster. these are critical position which i finally got it right after many hours trial. the engine runs at about 1500~1800rpm and governing the load properly now.





hope this help

[beambeam]

If you pm me your email i can send you the repair manual pdf for the lee 100.It's pretty much the same as the lae except for some emission changes.Also startomatic has been a great help to me.He knows his stuff.


                                                                                          jim

[santsalvador]

OK JIm And Startomatic thanks for that, ill check but think Mine is the same setting although my throttle linkage is the lever and press off type.
my email is santsalvadorkennels@gmail.com
Terry.

[santsalvador]

HI Jim and Startamatic. Well, ive tried every combination of spring attachment including the one in the manual (thanks Jim) Ive adjusted the governor bolt from beginning to end also setting it as per the manual with no success.
Could it possible be the timing on the flywheel, Tappets have been set.
According to Yanmar it wouldnt be the governor internally!!
I,m so loathed to putting it in a garage here as they charge a fortune and take months.
Terry.

[Startomatic]

you should check the fuel filter too. this is inside the diesel tank. my experience is when water find its way to the fuel, the filter somehow will get block to allow sufficient diesel to reach the fuel pump.

the timing on the flywheel is fixed. you cant do anything with it.

i will open up my throttle linkage this weekend and take a picture for your reference. just hang on there.

[santsalvador]

HI. The fuel filter is clean, Ive heard that the flywheel can move on the keyway, hence putting the timing out.
I am using this engine on a 4.5 kva generator and can use it but have to adjust the throttle manually before the inverter drops out, once I get the revs/voltage stable, around 230 volts, its fine and will stay like that until the batteries are charged, once I disconnect from the inverter the revs/voltage goes through the roof.
It seems that when the load, ie inverter connects the engine needs more fuel to increase the revs/volts but its not getting it so there fore the load pulls the engine speed down consequently voltage as well and the inverter drops out, then the engine keeps cycling connecting disconnecting.
Thats why I assume its the governor.
Terry.

[Startomatic]

Terry, it sound like my problems too. i was driving a rather heavy pressure jet with a load/unload valve.

when it was loaded, it was not able to increase fuel flow ans soon the engine die and when it was unloading, the rpm shot thru the roof as you said.

it was cured by adjusting the spring position in the governor linkage and the bottom stop bar which is also spring loaded and has a mark effect of speed governing.

let me send you the pic of the spring position this weekend.

[beambeam]

Hi Terry and startomatic;
I noticed on the picture that you put on that the spring has tension but the spring loaded pin is only about half way in.If i put any tension on mine the pin will go all the way in.the governor spring seems like it overpowers the spring loaded pin and the governor moves proportionally to the throttle linkage.This makes it difficult to stabalize at lower revs.I adjusted it so it was half way in like yours but the revs would go too high and if i backed the throttle off manually it would stall.I can only get two main positions too fast or stall.If i controll the linkage with my finger with the governor linkage backed off i can get it down lower but it is so touchy that the slightest movement on the throttle will make it rev up or stall.If i find a fix for this i will be sure to let you guys know.


                                                                                      jim