Yanmar 1GM10 Shop Manual Download

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FUEL INJECTION

AND GOVERNOR SYSTEMS

157

GOVERNOR SPRING

SECONDARY GOVERNOR SPRING

4. If disassembly of the governor shaft assembly is re-
quired, remove the retaining bolts

(29, Figure 47 or Fig-

ure 48) and remove the shaft assembly. To disassemble
the components, detach the snap ring

then drive out

the tapered pins that retain the levers. Replace the worn
parts.
5. Remove the idle adjuster bracket and side cover (4,
Figure 47 or Figure 48).
6. Check the speed control lever and shaft

(12, Figure 47

Figure 48) for excessive play between the shaft and the

timing

and between the lever and the shaft.

a. If the shaft is loose in the timing gearcase, remove

the nut

Figure 47 or Figure

then remove

the speed control lever

(3). Remove the shaft (12)

and determine if the shaft, the timing

both are worn. Replace or repair the worn part.

b. If the lever is loose on the shaft, remove the nut

(1,

Figure 47 or Figure

then remove the speed

control lever

(3). Determine if the lever, the shaft or

both are worn. Replace any worn parts.

7A. On 1 GM and 1 GMIO models--Check the stop shaft

(5, Figure 47) for excessive play between the shaft and
the timing gearcase. If excessive play is evident, remove

the nut

then withdraw the shaft. Determine if the

shaft, the timing

or both are worn. Replace or re-

pair any worn parts.
7B. On

3HM and

models--Check the stop shaft (5,

Figure 48) for exces-

sive play between the shaft and the timing gearcase. If ex-
cessive play is evident, drive out the taper pin (6) by
driving against the small end of the pin. Remove the lock-
ing screw

(7). Remove the nut

then remove the shaft.

Determine if the shaft, the timing

or both are

worn. Replace or repair any worn parts.
8. Inspect the governor springs for damage and distor-
tion. Measure the length of the main and secondary gover-
nor springs as shown in

Figure 49. Replace either spring

if its free length dimension is not as specified in

Table 2.

If either spring is questionable, take it to a Yanmar dealer-
ship for testing.
9. Remove and inspect the thrust collar (32, Figure 47 or
Figure 48). Replace the thrust collar if damaged or if the
thickness is less than

2.9

(0.114 in.).

10. Remove the thrust bearing (33, Figure 47 or Figure

48). Replace the bearing if damaged.

1 1 . Remove the governor sleeve (34, Figure 47 or Fig-

ure 48). Inspect the governor sleeve and crankshaft for
damage. Refer to the specifications in

Table 3.

12. Check the operation of the flyweight assembly (37,

Figure 47 or Figure 48). The flyweights should move
smoothly without excessive looseness. The contact sur-
face in the flyweight groove should not be excessively
worn. The flyweight assembly must be replaced as a com-
plete assembly. Remove the crankshaft nut as described in

Chapter Five or Six to remove the flyweight assembly.

13. Reassemble the governor assembly by reversing the

disassembly procedure while noting the following:

a. Do not distort the governor springs during installa-

tion.

b. Install the governor springs so the long hook end

engages the speed control lever

(12, Figure 47 or

Figure 48).

c. Install the secondary governor spring

(14, Figure

47 or Figure 48) so the lower end of the spring fits
in the loop on the main governor spring.