Yanmar 1GM User Manual page 80

74
To remove the cylinder head, proceed as follows:
1. Disconnect the negative battery cable.
2. lf not previously performed, drain the cooling system
as described in Chapter Four.
3. Remove the alternator as described in Chapter Nine .
4. If
not
previously disconnected. detach the exhaust
hose from the exhaust elbow.
5. Loosen the hose clamps and remove the water hose (A,
Figure II ) from the exhaust elbow and thermostat bous-
mg.
6. Remove the exhaust elbow.
7. Disconnect the lower water hose (8. Figure II ) from
the thermostat hou sing.
S.
Disconnect the wire lead from the water temperature
sender (Figure 12).
9. Remove the air cleaner and the air cleaner base (Fig-
ure
13).
10. Remo ve the fuel injector and prec ombustion chamber
as described in Chapter Seve n.
11. Remove the valve cover as previously described.
12. Remove the rocker ann stand retaining nut (A, Fil:.
UTf.'
14), then remove the rocker assem bly (B).
13. Remove the push rods ( FiJ:.u n~ 15) and mark them so
they can be reinstalled in their orig
inal positions.
14. Detach the oil line fitting (FiI:UTe16) from the cylin-
der head.
15. Unscrew the cylinde r head retaining nuts (Figure 17)
in a crossing pattern.
16. Remove the cylinde r head and head gasket.
Inspection
1. If service to the valves or rocker ann assembly is re-
quired, refer to the Valves and Rocker Shaft Assembly sec-
lions.
C HA PTER FIVE