Toyota Supra 1990 Manual page 357

IGNITION SYSTEM - Cam Position Sensor (7M-GTE)
IG-23
IG06B4
Groove
Drilled Mark
IG0675
IG0676
IGOO77
Drilled Mark
F5607
7. REMOVE CAM POSITION SENSOR
(a) Remove the hold-down bolt.
(b) Pull out the cam position sensor from the cylinder
head.
8. REMOVE O-RING
REPLACEMENT OF CAM POSITION SENSOR
DRIVEN GEAR
1. GRIND DRIVEN GEAR AND PIN
(a) Align the drilled mark on the driven gear with the
groove of the housing.
(b) Place a matchmark on the cam position sensor shaft
that aligns with the groove of the housing.
(c) Using a grinding wheel, grind the gear and pin.
NOTICE: Be careful not to damage the shaft.
2. REMOVE PIN AND DRIVEN GEAR
(a) Using a punch and hammer, drive out the pin.
(b) Remove the driven gear and discard it.
3. INSTALL NEW DRIVEN GEAR AND PIN
(a) Align the matchmark with the groove of the housing.
(b) Align the drilled mark on the new driven gear with the
groove of the housing.