A little stumped here, my yanmar 2gmf13 is running well and strong, however I cannot get it below 1500 rpms, even when I throttle all the way down until lever will not move anymore, it won't go passed 1500, also resistance on the lever when I throttle up, but still works. I happened to notice this the first sail after changing the secondary fuel filter, can't see how this can be a fuel issue but thought I would mention it. Could it just be a loose connection somewhere along the throttle cable?
Yanmar 2gm throttle resistance, can't get RPMS below 1500
- Thread starter Mattcia123
- Start date
Check that the speed control lever is going all the way to the mechanical stop. If the throttle cable casing slips in the clamp, it could not let the lever go all the way to the stop.. A drop of diesel may have lubricated the clamp enough to let it move just a smidge.. In this picture, the screw/nut just below the brass block is the idle stop screw. The lever that the brass block connects to should touch that screw at idle. If the lever is not touching, the cable housing clamp (screws right below the red oval drawn in) has probably slipped aft and needs to be repositioned forward so that the lever touches the screw. Loosen the clamp a little, reposition, then retighten. the clamp. This is on a 3 GM, but your 2GM is identical.
It may have slipped at the clamp under the compass but since you were working in the area of the throttle, I suspect it may be the engine side.. Sounds like you may need a new cable or at least some lube to make it move more freely?
It may have slipped at the clamp under the compass but since you were working in the area of the throttle, I suspect it may be the engine side.. Sounds like you may need a new cable or at least some lube to make it move more freely?
I had this on my 3ym30 (throttle assy looks the same). It took a little oil right where the lever goes into the engine. I readjusted the idle speed with the set screw.
It can get corroded and cause too much friction. It can also be all those other things kloudie1 mentioned.
It can get corroded and cause too much friction. It can also be all those other things kloudie1 mentioned.
Probably the cable is corroded and or has broken strands. They don't last forever. To check disconnect the cable from the engine and see if the throttle works properly at the engine. You could try lubing the cable but might not help so better to replace it. Not a hard job depending on access at the cockpit end.
Check the throttle area for any rust.. If you have a small leak in the heat exchanger, the throttle can be the first part to show rust. If there is any rust, hit the throttle arm with penetrating oil and work it til it operates freely. The find out where the water is coming from and fix that, or the throttle will lock up again...