Yanmar ELECTRONIC CONTROL SYSTEM 2G ECO GOVERNOR
Eco-Governor is Yanmar’s unique electronics control governor system which has been used for over 10 years mainly on agricultural machines. Yanmar has renewed this system to aplly to all equipment and named it “2G Eco-Governor” which means second generation Eco-Governor. In addition an EGR valve is controlled by this system.
FUEL PUMP REPLACEMENT
If you replace the pump you have to calculate the injection timing difference between these pumps:
- Remove the old pump and take a note of the timing index recorded in that pump.
- Read the timing on the new pump and calculate the difference between new and old angle.
- Put the pump temporarily on the gear case and install the drive gear accordingly to the ID marks you made earlier. (Tightening torque of installation nut => 113 – 123 Nm)
- Use the marking on the sticker to adjust the calculated (injection angle difference.
- If you have calculated a positive angle correction value, push the fuel pump away from the cylinder block to delay the injection timing and vice versa to advance the timing in case of a negative value.
Normally it is enough to put a mark on fuel pump drive gear and idler to be able to reassemble the pump on the correct position after removal. But when the injection pump was mounted in the wrong position or the engine has rotated after removal of the pump there is a more precise way to put everything right on time.
Yanmar Engine Training
On the crankshaft pully are 3 timing marks, 2 bulges and 1 notch. You have to align this notch to the 0° mark on the distribution cover (TDC cyl.1), make sure that cyl 1 is not only on his TDC but also on compression AND be able to see the “B” mark on the idler in the middle (not to high or to low) of the opening from the fuel pump driver cover. These 3 situations combined appear only once every !50! Crankshaft revolutions so a little patience can be helpfull...When you have the engine in this position you can align the “B” mark on the fuel pump drive gear with the “B” mark of the idler and the gears will be positioned perfectly.
If you like to replace the fuel pump you have to follow the previous steps but this time completely remove the 7 mounting bolts on the pump and the support on the rear of the pump. You also have to disconnect the fuel, oil & electric lines. Be carefull for high pressure when you are disconnecting the fuel lines!
Proceed by removing the fuel pump drive gear cover. Then remove the center nut. NEVER loosen the four flange bolts! They connect the fuel pump drive gear to the flange through slotted holes. When they are loosened the fuel pump drive gear can rotate freely and all references of timing will be lost!
To be able to adjust the fuel pump you first have to loosen 7 bolts. 3 on the rear support and 4 on the flange at the distribution side. In red line you see the position of 2 of them behind the pump house. These can be reached using a ¼, 14mm socket and extensions as shown in the picture. The nuts and bolts don’t have to be removed just loosened.