Yanmar 4TNV98 Service Manual page 233

Contact Continuity Test
Depress the plunger at the bottom of the magnetic
switch. Check for continuity between the "B" and
"M" terminals using a multimeter (Figure11-23).
The multimeter should indicate continuity.
If the multimeter does not indicate continuity,
replace the magnetic switch.
Figure 11-23
Pinion Clutch Assembly
Pinion Clutch Assembly Inspection
Manually rotate the pinion clutch assembly in the
drive direction (Figure11-24). It should rotate freely
in the drive direction and is locked by turning it in
the opposite direction. Replace the pinion clutch
assembly if the results are different.
Figure 11-24
4TNV98 & 4TNE98 Diesel Engine
Slide the pinion clutch assembly on the shaft. It
should slide smoothly on the shaft (Figure11-25).
Rust, too much grease or damage could prevent
the pinion clutch from sliding smoothly. If the pinion
clutch assembly does not slide smoothly, clean the
shaft and pinion clutch assembly or replace the
damaged component.
Ball Bearing Inspection
Rotate each ball bearing while holding the pinion
clutch assembly (Figure11-26). Replace the ball
bearing if it does not rotate smoothly or has
excessive play.
231
Figure 11-25
Figure 11-26
Section 7. Starter Motor