Suzuki DF70A Service Manual page 151

Valve guide replacement
CAUTION
Be careful not to damage cylinder head when
replacing valve guide.
1) Using valve guide remover, drive valve guide out
from combustion chamber side towards valve spring
side.
NOTE
Do not reuse valve guide once it has been
removed.
Always use a new valve guide (oversize)
when assembling.
Special tool
(A): 09916–44310 (Valve guide remover)
2) Ream valve guide hole with φ 10.5 mm reamer to
true hole and remove burrs.
NOTE
Turn reamer clockwise, never
counterclockwise.
Special tool
(B): 09916–37320 (Valve guide reamer (φ
10.5 mm))
(C): 09916–34542 (Valve guide reamer
handle)
(C)
3) Install valve guide to cylinder head.
(A)
I9J011140050-01
4) Ream valve guide bore with φ 5.5 mm reamer.
(B)
I9J011140051-01
Power Unit Mechanical:
• Heat cylinder head to a temperature of 80 – 100
°C (176 – 212 °F).
Apply heat uniformly so that head will not be
distorted.
• Use special tools to drive new valve guide into
hole.
Drive in new valve guide until special tool (valve
guide installer attachment) contacts cylinder head.
• After installing, check valve guide protrusion "a".
Special tool
(D): 09916–58210 (Valve guide installer
handle)
(E): 09917–87010 (Valve guide installer
attachment)
Valve guide protrusion "a"
Standard (IN., EX.): 10.8 – 11.6 mm (0.43 – 0.46
in.)
" a "
NOTE
Clean and oil valve guide bore after reaming.
Special tool
(F): 09916–34550 (Valve guide reamer (φ 5.5
mm))
(C): 09916–34542 (Valve guide reamer
handle)
(C)
1D-40
(D)
(E)
I9J011140052-01
(F)
I9J011140053-02