11-34
ENGINE
CYLINDER HEAD AND VALVE
Valve Spring
(1)
Measure the free spring height, in case it is less than the limit
value, change the spring.
Standard value: 51.0 mm
Limit value: 50.0 mm
(2)
Measure the perpendicularity of the center line with the surface
of the spring, if the gradient exceeds the limit, change the spring.
Standard value:
2
Limit value: 4
Valve Guide
(1)
Measure the clearance between the valve guide and the valve
stern, if the clearance exceeds the limit value, Change the valve
guide or valve or both of them.
Standard value:
Intake value ........................... 0.02
0.05mm
Exhaust value ........................ 0.03
0.07mm
Limit value:
Intake value ........................... 0.10mm
Exhaust value ........................ 0.15mm
Valve Seat
1)
Assemble the valve and measure the protruding height of the
valve stern between the end of valve stern and valve spring seat.
In case the measured value exceeds the specified limit, change
the valve seat.
Standard value:
Intake value ........................... 49.30mm
Exhaust valve ........................ 49.30mm
Limit value:
Intake value ........................... 49.80mm
Exhaust value ........................ 49.80m
Main Points on Trimming of Valve Seat
(1)
Before trimming the valve seat, check the clearance between the
valve guide and the valve rod, conduct the trimming where
necessary.
(2)
Trim the width and angle of the valve seat to the specified value
with the Muller.
(3)
Grind the valve seat with the corresponding valve with grinding
paste after trimming the valve seat. Then check the protruding
height of the valve stern (refer to inspection items of valve seat).
angle belwee cerrter line of spring and plun bine
of subface
free spring height
1EN0264
valve
guide
inside diamter of
valve guide
outside diameter
of valve guide
1EN0279
endof valve stern
protruding height
of valve stern
seat face of valve
spring
DEN0212
0.9
1.3mm
43.5
44
6EN0491
