Engine Mechanical: 1D-40
Valve Seat Repair
B831G21406027
The valve seats (1) for both the intake and exhaust
valves are machined to three different angles. The seat
contact surface is cut at 45°.
CAUTION
!
• The valve seat contact area must be
inspected after each cut.
• Do not use lapping compound after the
final cut is made. The finished valve seat
should have a velvety smooth finish but
not a highly polished or shiny finish. This
will provide a soft surface for the final
seating of the valve which will occur
during the first few seconds of engine
operation.
NOTE
After servicing the valve seats, be sure to
check the valve clearance after the cylinder
head has been reinstalled. Refer to “Valve
Clearance Inspection and Adjustment in
Section 0B (Page 0B-4)”.
Cam Drive Idle Gear / Sprocket Thrust
Clearance Inspection and Adjustment
B831G21406028
Inspection
• Install the cam drive idle gear/sprocket (1) and tighten
the shaft (2) to the specified torque.
Tightening torque
Cam drive idle gear/sprocket shaft (a): 41 N·m (
4.1 kgf-m, 29.5 lb-ft)
• Measure the thrust clearance between the idle gear
and shim by using a thickness gauge.
Special tool
(A): 09900–20803 (Thickness gauge)
Cam drive idle gear/sprocket thrust clearance
Standard: 0.15 – 0.27 mm (0.006 – 0.011 in)
Intake Exhaust
Seat angle 30°/45°/60° 15°/45°/60°
Seat width
0.9 – 1.1 mm
(0.035 – 0.043 in)
←
Valve
diameter
36 mm
(1.42 in)
33 mm
(1.30 in)
Valve guide
I.D.
5.500 – 5.512 mm
(0.2165 – 0.2170 in)
←
1
1
60°
30°
45°
15°
45°
60°
IN EX
I831G1140170-02
(a)
1
2
I831G1140171-01
(A)
I831G1140172-01
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