Doosan G643 - Thermostat Removal; Valve Rocker Arm Cover Removal

G643 (E) Service Manual Chapter 3. Engine Mechanical System 63
4. Remove pump from engine.
5. Remove gasket and clean surface.
Valve Rocker Arm Cover Removal
Figure 12-5
Remove or Disconnect
1. Valve rocker arm cover bolts.
2. Valve rocker arm covers.
3. Gaskets.
Figure 12-5 Valve Rocker Arm Cover
Thermostat Removal
Start By:
a. Draining coolant from radiator.
b. Removing upper radiator hose from thermostat
housing.
< Components >
1. Gasket-Thermostat Housing 2. Thermostat Housing Spacer
3. Thermostat Assembly 4. Housing-Thermostat 5. Bolt
6. ECT Sensor-SECM 7. Plug 8. Fitting
9. Water Temp Sender
1. Remove bolts. Remove thermostat housing and
gasket.
2. Remove failed thermostat.
3. Clean both mounting surfaces, engine and
thermostat housing of any gasket material.