Yanmar EF-494T - Adjustment Specifications; Engine Adjustments; Cylinder Head; Intake;Exhaust Valve and Guide

3 ENGINE 3 ENGINE
EF494T TM 06/2011 edition
112
3.5 ADJUSTMENT SPECIFICATIONS
3.5.1 Engine adjustments
No.
Inspection item
Standard
Limit
1
Intake/exhaust valve clearance (mm)
0.15 to 0.25
―
2
Tension of V-belt at
98 N (10 kgf) (mm)
Between
alternator and
crank pulley
For used
product
10 to 14
―
For new product
8 to 12
―
3
Fuel valve injection pressure MPa (kgf/cm
2
)
21.57 to 22.55
(220 to 230)
―
4
Compression pressure MPa (kgf/cm
2
)
3.43 (35)±0.1 (1)
2.75 (28)±0.1 (1)
5
Cooling water quantity (L)
2.4 (Sub tank 0.45)
―
6
Lubricating oil quantity (in oil pan) (L)
5.3
2.4
7
Lubricating oil pressure MPa (kgf/cm
2
)
At rated speed：
0.29 (3.0) to 0.39 (4.0)
At idling speed：
0.06 (0.6)minimum
8
Hydraulic switch actuating pressure MPa (kgf/cm
2
)
50±10 (0.5±0.1)
―
9
Thermostat
Temperature at
which the valve is
opened (°C)
Lift to fully open
the valve (mm)
(temperature)
85
8 minimum (95°C)
3.5.2 Cylinder head
No.
Inspection item
Standard
Limit
1
Distortion of combustion surface (mm)
0.05 maximum
0.15
2
Valve recession (mm)
Intake
0.30 to 0.50
0.8
Exhaust
0.36 to 0.56
0.8
3
Valve seat
Seat angle
(degrees)
Intake
120
―
Exhaust
90
―
Seat correction angle (degrees)
*See the engine service manual.
40、150
―
3.5.3 Intake/exhaust valve and guide
No.
Inspection item
Standard
Limit
1
Intake valve
Guide I.D. (mm)
8.010 to 8.250
8.10
Stem O.D. (mm)
7.955 to 7.975
7.90
Clearance (mm)
0.035 to 0.070
0.18
Exhaust valve
Guide I.D. (mm)
80.15 to 8.030
8.10
Stem O.D. (mm)
7.955 to 7.960
7.90
Clearance (mm)
0.045 to 0.075
0.18
2
Valve guide projection from cylinder head (mm)
14.7 to 15.0
3
Valve guide installation method
Expansion fit
―