Manual

Engine Maintenance And Servicing Manual
Assembly:
——Clip the thermostat seat, and put the rubber seal ring into the thermostat hole.
——Install the thermostat (with spring outward)
——Install spring clip, ensure that the clip is clipped in the thermostat seat groove.
——Install the sealing gasket of the new thermostat seat on the thermostat assembly with a bolt.
——Install the thermostat together with thermostat assembly into the rear end hole of cylinder head. Finger
screw in 3 bolts and tighten to 88 in-lbs.
——Tighten the hex head plug with the sealing gasket on. Tightening torque is 38-42Nm.
——For the engine equipped with electrical heater, install air intake preheating switch. Tightening torque is
30 ft-lbs.
3. Removal and assembly of the water temperature sensor.
Removal:
——Remove the water temperature sensor (at the exhaust side, under the rear lug).
Assembly:
——Before installation, apply the lotite sealant 243 onto the bolt threads. Finger screw in and tighten to
80 in-lbs.
【15】. The intake and exhaust system of the engine
1. Description for the intake and exhaust system of carburetor engine.
The intake system of Carburetor Engine 478 and 480 includes: air filter, Intake hose, Guide cover, Carburetor,
Intake hose, Intake air preheating hose of Positive Crankcase Ventilation（PCV）, and so on.
——Air filter type is 1GD129607G, and its basic parameters are as the following:
Filtering area: 100cm2 nominal air flow(L): 600±150
filtering efficiency: ≥99% filtering resistance: 2kPa
Thermostat
Sealing gasket
Overflow pipe
Drainage pipe
Sealing gasket
Small recircula-
ting pipe
Plug screw
Spring clip
Sealing gasket
Tighten torque
Fig.100
Temperature seat assembly
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