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Reamer
Reamer
Valve Guide
Tool No.
Oversize
Size
C-3433
0.127 mm
9.63-9.65 mm
(0.005 inch)
(0.379-0.380 inch)
C-3430
0.381 mm
9.88-9.91 mm
(0.015 inch)
(0.389-0.390 inch)
C-3427
0.762 mm
10.26-10.29 mm
(0.030 inch)
(0.404-0.405 inch)
J9009-100
Fig. 13 Reamer Sizes
REFACING
VALVES
AND VALVE
SEATS
The i n t a k e and exhaust valves have a 44-1/2° t o
45° face angle. The valve seats have a 45° t o 45-1/2°
face angle (Fig. 14).
D
A-SEAT WIDTH (INTAKE 1/16 (1.587 mm) TO 3/32 (2.381 mm) INCH
EXHAUST: (.O8CK10O INCH) - (2-15 mm)
B-FACE ANGLE (INTAKE & EXHAUST: 4 4 ^ - 4 5 ° )
C-SEAT ANGLE (INTAKE & EXHAUST: 45°-45M°)
D-CONTACT SURFACE
PU605
Fig. 14 Valve Face and Seat Angles
VALVES
Inspect t h e r e m a i n i n g m a r g i n after the valves are
refaced (Fig. 15). Valves w i t h less t h a n 1.190 m m (3/
64 inch) m a r g i n should be discarded.
INTAKE
VALVE
FACE'
•STEM*
VALVE SPRING
RETAINER LOCK
GROOVES
EXHAUST
VALVE
RP129
VALVE
SEATS
CAUTION: DO NOT unshroud valves during valve
seat refacing (Fig. 16).
Fig. 15 Intake and Exhaust Valves
Fig. 16 Refacing Valve Seats
(1) W h e n refacing valve seats, i t is i m p o r t a n t t h a t
the correct size valve guide pilot be used for reseat-
i n g stones. A t r u e and complete surface m u s t be ob-
tained.
(2) Measure t h e concentricity of valve seat u s i n g
d i a l indicator No. 13725. Total runout should not ex-
ceed 0.051 m m (0.002 inch) t o t a l indicator reading.
(3) Inspect the valve seat w i t h Prussian blue t o de-
t e r m i n e where t h e valve contacts t h e seat. To do
t h i s , coat valve seat L I G H T L Y w i t h Prussian blue
t h e n set valve i n place. Rotate the valve w i t h l i g h t
pressure. I f the blue is transferred to t h e center o f
valve face, contact is satisfactory. I f the blue is t r a n s -
ferred t o the top edge o f valve face, lower valve seat
w i t h a 15° stone. I f the blue is transferred t o b o t t o m
edge o f valve face raise valve seat w i t h a 60° stone.
(4) W h e n 'seat is properly positioned t h e w i d t h o f
i n t a k e seats should be 1.587 to 2.381 m m (1/16 t o 3/
32 inch). The w i d t h of t h e exhaust seats should be
2.00-2.50 m m (0.080-0.100 inch).
TESTING
VALVE
SPRINGS
(1) Whenever valves have been removed for inspec-
t i o n , reconditioning or replacement, valve springs
should be tested. A s a n example t h e compression
l e n g t h o f the spring t o be tested is 1-5/16 i n c h . T u r n
table o f Tool C-647 u n t i l surface is i n l i n e w i t h t h e
1-5/16 i n c h m a r k on the threaded stud a n d the zero
m a r k to the front (Fig. 17). Place spring over stud on
the table and l i f t compressing lever to set tone de-
vice. P u l l on torque wrench u n t i l p i n g is heard. T a k e
reading o n torque wrench a t this i n s t a n t . M u l t i p l y
t h i s reading by two. This w i l l give the s p r i n g load a t
test l e n g t h . Fractional measurements are indicated
on the table for finer adjustments. Refer t o specifica-
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