To check or set the correct fuel injection timing, you need to know:
- - the position of the crankshaft of the engine during the compression stroke in the first cylinder;
- - for the high-pressure fuel pump, the position of the camshaft at the beginning of the fuel supply by the eighth section.
In order to quickly and accurately locate and position the engine crankshaft and high pressure fuel pump camshaft, the fuel pump body, automatic fuel injection advance clutch and the rear flange of the drive half are marked.
In fig. 2, these marks are respectively designated "A", "B" and "C".
The fuel injection advance angle is set correctly if the marks "A" and "B" on the fuel pump housing and the fuel injection advance coupling are aligned, and the mark "C" on the rear flange of the drive coupling half is in the upper position, to install the rear flange 8 to the position in which the mark "C" will take the upper position on the latch, it is necessary to unscrew the bolts and remove the cover of the lower hatch of the clutch housing.
Inserting the crowbar into the flywheel holes, turn the crankshaft to a position where the “C” mark will move from bottom to top.
At this point, rotate the flywheel lock pin 90˚ and lower it into the deep groove.
Continue turning the crankshaft with a crowbar by the flywheel until the latch enters the flywheel hole.
This will be the top fixed position of the "C" mark on flange 8; at the same time, the compression stroke will end in the first cylinder.
Align marks "A" and "B" on the pump housing and fuel injection advance coupling, install the pump and bolt to the engine block.
Tighten the pump-to-block mounting bolts evenly, in several stages, in the sequence shown in fig. 3.
Without violating the mutual alignment of the position of the marks "A" and "B" on the pump housing and the fuel injection advance clutch, connect the upper end of driven coupling half 2 with front plate 4.
Install the locking pin in the shallow groove, turn the crankshaft one turn, install and tighten the second bolt 6.
When a compressor and hydraulic booster pump are installed on the engine, flange 8 (especially the mark on the flange) is difficult to see.
In this case, it is more convenient to determine the upper position of the “C” mark on the rear flange 8 of the drive coupling half by the valves.
To do this, remove the head cover of the first cylinder (Fig. 4), and turn the crankshaft with a crowbar by the flywheel until the intake valve closes (the front valve from the fan).
Move the lock pin into the deep groove and continue rotating the crankshaft until the lock enters the flywheel hole.
This will be the fixed position of the crankshaft, at which the mark “C” of flange 8 (see Fig. 2) will be in the upper position.
After installing the pump on the engine, connecting the control drive, oil supply (removal) pipes, fuel lines and high pressure pipes, additionally check and refine the setting of the fuel injection advance angle.
To do this, move the regulator control lever 2 (see figure) to the middle operating position and lower it all the way into bolt 3.
Bleed the engine power supply system with a manual booster pump for 2-3 minutes.
Turn the crankshaft half a turn counterclockwise, as viewed from the fan side, and move the lock pin into the deep groove.
Slowly rotate the crankshaft in the direction of rotation until the latch enters the flywheel hole.
If the marks on the pump housing and the injection advance coupling are aligned, then the injection advance angle is set correctly.
If the marks are not aligned, then loosen the upper bolt 6 (see Fig. 2) of the driven half-coupling, install the locking pin and in a small groove, turn the crankshaft in the direction of rotation by one turn and loosen the fastening of the second bolt 6.
Turn the injection advance clutch counterclockwise (counterclockwise as viewed from the flywheel side) until the bolts stop in the groove of the front plate 4.
Lower the flywheel retainer into the deep groove and turn the crankshaft in the direction of rotation until the retainer aligns with the hole in the flywheel.
Turn the injection advance clutch behind the flange of the driven coupling half 2 in the direction of rotation until the marks on the pump housing and the advance clutch align.
Tighten the upper bolt 6, move the flywheel lock pin into a small groove, turn the crankshaft one turn and tighten the second bolt 6.
Check the accuracy of the coincidence of the marks on the pump housing and the injection advance clutch one more time in the same way.
After setting and checking the fuel injection advance angle, start the engine, warm up to a coolant temperature of 80˚ C and use bolt 3 (see picture) adjust the minimum crankshaft speed, which should not exceed 600 rpm.