Service manual

ENGINE INSPECTION
NOTE: Measure the fitting pressure after compressing the
spring several times.
Spring Fitting Pressure Inner
Fitting Length 1.49 in (37.8mm)
Fitting Pressure Limit 24.92 Ib (11.3kg)
VALVE SPRING
TESTER~
Outer
1.59 in (40.3mm)
66.36 Ib (30.1 kg)
SPRING FITTING
PRESSURE
--+\---~
I
VALVE GUIDE
1. Inspecting clearance between valve and guide. Set a
dial gauge with a magnet and check the clearance
between the valve stem and the valve guide.
If the clear-
ance is more than the limit, replace the valve or valve
guide.
Clearance Limit 0.005 in (0.127 mm )
VALVE GUIDE CLEARANCE
2. Valve guide replacement. To remove the valve guide,
press out the valve guide towards the combustion cham-
ber side, using the valve guide installer (49
0636 165A).
Again using the valve guide installer, press in the valve
guide into the cylinder head until the valve guide height
reaches the indicated scale on the valve guide installer.
NOTE: Be sure to press in the valve guide so that the
inside chamber on the valve guide end faces to the
combustion chamber side. After the pressure fit, check the
length of the protruding portion of the valve guide.
Protrusion Standard 0.650 in (16.5mm)
HEIGHT ABOVE
THE SPRING SEAT
0.65 in (16.5mm)
VALVE GUIDE
INSTALLER
3. Dimension L. Check the protruding length of the valve
stem,
if it exceeds the specification, correct it as follows:
Dimension L Standard 1.890 in (48.0 mm)
a. When dimension L becomes larger 0 - 0.0202 in
(0 - 0.5 mm) from the standard, it is still possible to
use both the valve and the cylinder head.
VALVE SEAT
. INSERT
b. When dimension L becomes too large 0.20 - 0.059 in
(0.5 - 1 5 mm) from the standard, adjust the
dimension L to the standard by adding some washers
(inner diameter
0.504 in (12.8 mm), outer diameter
1.535 in (39 mm) between the lower spring seat and
the cylinder head.
c. When dimension L becomes too large (more than
0.059 in(1.5mm) from the standards, replace the
valve's seat.
Engines & Generators
15