SECTION 10 – ENGINE – CHAPTER 1
10-4
VALVE SEATS
Exhaust Valve Seat Angle
45
°
00’ – 45
°
30’
Intake Valve Seat Angle
30
°
00’ – 30
°
30’
Interference Valve Face Angle
to Valve Seat Angle
0
°
30’ – 1
°
15’
Concentricity With Guide
Diameter
0.051mm (0.002 in) Total Indicator Reading Max
Seat Width Exhaust Valve
1.8–2.3mm (0.072–0.092 in)
Intake Valve
1.9–2.5mm (0.078–0.098 in)
VALVE TIMING
Intake Opening
12
°
Before Top dead centre
Intake Closing
38
°
After Bottom Dead Centre
Exhaust Opening
48
°
Before Bottom Dead Centre
Exhaust Closing
12
°
After Top Dead Centre
CAMSHAFT IDLER GEAR
Number of teeth
47
End Play
0.076–0.35mm (0.003–0.014 in)
Bushing Inside Diameter
50.813–50.838mm (2.005–2.0015 in)
Adaptor Outside Diameter
50.762–50.775mm (1.9985–1.9990 in)
Backlash with Crankshaft Gear
0.10–0.36mm (0.004–0.014 in)
Backlash with Camshaft Gear
0.10–0.36mm (0.004–0.014 in)
Backlash with Fuel Injection Pump
0.10–0.48mm (0.004–0.019 in)
CAMSHAFT GEAR
Number of Teeth
52
Timing Gear Backlash with idler
0.10–0.36mm (0.004–0.014 in)
ROCKER ARM SHAFT
Shaft Diameter
25.40–25.43mm (1.000–1.001 in)
Shaft Support Internal Diameter
25.45–25.20mm (1.002–1.004 in)
ROCKER ARM
Inside Diameter
25.48–25.50mm (1.003–1.004 in)
TAPPETS
Clearance to Bore
0.015–0.058mm (0.0006–0.0023 in)
Tappet Diameter
25.113–25.131mm (0.9889–0.9894 in)
Tappet Bore Diameter
25.146–25.171mm (0.9900–0.9910 in)