Yanmar MP series Service Manual page 73

FUEL INJECTION PUMP
Plunger (Bottom Clearance) Measurement
The MP fuel pump injection timing is set by
adjusting the plunger height. This is accomplished
using shims in the roller lifter body to move the
plunger up or down (bottom clearance) from the
camshaft base circle.
5. Using shims from the shim kit in the Yanmar
Parts Catalog (MP2 - PIN 158553-51250),
(MP4
-
PIN 129906-51 400), increase or
decrease the shim pack (Figure 5-69, (3)) in
the roller lifter bore to obtain the zero
mark (+ 0.03 mm) on the dial indicator.
Note: Do not use the ball tip on the dial
indicator when measuring, use the dial
indicator extension alone.
1. Mount the dial indicator (from Yanmar Special
Tool Kit PIN 458091) in the adapter and thread
into barrel.
2. Position the camshaft with the roller lifter at the
bottom of the cam profile.
3. Remove the dial indicator and adapter and zero
the dial indicator (Figure 5-68, (1)) using the
specified spacer (Figure 5-68, (2)). The correct
size spacer can be found in the calibration data
sheet (bottom clearance [mm]) for each pump
number.
0001314AA
1. Dial Indicator 3. Flat Surface
2. Plunger Spacer
Figure 5-68
4. Reinstall the dial indicator (Figure 5-69, (4))
into the barrel (Figure 5-69, (1)) and record the
measurement.
YANMAR,
MP series service Manual
1. Barrel
U
0001315A
4. Dial Indicator
2. Plunger 5. Plunger
3. Shim(s) Adjustment
Dimension "An
Figure 5-69