Yanmar 1GM10, Руководство по ремонту

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110
CHAPTER SIX
ROCKER ARMS
AND
MODELS
U
INTAKE
EXHAUST
6. Inspect and measure the inside diameter of the rocker
arm bushing and the outside diameter of the rocker arm
shaft. Replace the rocker arm or rocker arm shaft if the
measurements exceed the specifications listed in Tables
NOTE
The rocker arm and bushing are available
as a unit.
7. Reassemble and reinstall the rocker arm assembly by
reversing the removal procedure. On
and
engines, identify the intake and exhaust
valves as shown in Figure 16, then position them on the
shaft in the order shown in Figure 17.
8. Adjust the valve clearance as described in Chapter
Three.
VALVES AND VALVE SEATS
Servicing the valves, guides and valve seats must be
done by a dealer or machine shop, as special knowledge
and expensive machine tools are required.
A
general practice among those who do their own ser-
vice is to remove the cylinder head, perform all disassem-
bly except valve removal and take the head to a dealer or
machine shop for inspection and service. Since the cost is
low relative to the required effort and equipment, this is
usually the best approach, even for experienced mechan-
ics. The following procedures are provided to acquaint the
home mechanic with the procedure.
VALVE COMPONENTS
1. Wear cap
2. Keys
3.
Valve spring retainer
4. Valve spring
5. Valve seal
6. Exhaust valve guide
7. Intake valve guide
8. Exhaust valve
9. Intake valve