Yanmar ViO12-2A, Service Manual

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2. TECHNICAL DATA
2-1-6
Item Unit
ViO12-2A
Engine
Main specifications
Compression pressure MPa 3.2 at 250 rpm
Cylinder head
Intake valve
Open bTDC degrees 7 to 17
Close aBDC degrees 35 to 45
Exhaust valve
Open bBDC degrees 35 to 45
Close aTDC degrees 7 to 17
Intake valve clearance (Cold engine) mm 0.2
Exhaust valve clearance (Cold engine) mm 0.2
Intake valve seat angle degrees 120
Exhaust valve seat angle degrees 90
Piston
First compression ring
Ring shape Keystone
Ring quantity pcs. 3
Second compression ring
Ring shape Taper face
Ring quantity pcs. 3
Oil-ring
Ring shape Bevel cutter (with coil expander)
Ring quantity pcs. 3
Governor
Name -
Type -
Fuel feed system
Fuel filter
Filter paper with automatic
air release device
Fuel filter filtration area cm
2
430
Oil/water separator Mesh filter screen
Feed pump Electrolical
Lubrication system
Lubrication pump Trochoid pump
LO pressure regulating valve opening pressure kPa 0.29 to 0.39
LO filter Full flow filter
LO filter filtration area cm
2
800
Filter valve opening pressure kPa 0.08 to 0.12
Operating pressure of alarm switch kPa 0.04 to 0.06
Cooling device
Cooling system Water-cooling (Radiator)
Fan belt size A36
Thermostat opening temperature ºC 71
Thermostat full-open temperature ºC 85
Radiator cap pressure kPa 88.3
Radiator fan
pcs.

Ø
mm
5

Ø230
Operating temperature of water temperature alarm switch ºC 107 to 113