Westerbeke 9.0 BCG Technical Manual page 58

Specified Value Allowable Limit
Valves (continued)
Valve seat angle
BCG4.0KW
45°
BCG 6.5 KW and BTG 9.0KW 45°30'
Valve head stock thickness - inches (mm)
Intake 0.035 - 0.059 0.031 (0.8 mm)
(0.9 - 1.5 mm)
Exhaust
0.047 - 0.071 0.039 (1.0 mm)
(1.2 - 1.8 mm)
Valve stem outer diameter - inches (mm)
Intake 0.2734 - 0.2740
0.2724 (6.920 mm)
(6.945 - 6.960 mm)
Exhaust 0.2732 - 0.2738
0.2720 (6.910 mm)
(6.940 - 6.955 mm)
Valve Spring
Free length - inches (mm)
BCG 4.0KW (outer spring)
1.6460 (41.8 mm) 1.5945 (40.5 mm)
(inner spring) 1.6141 (41.0 mm) 1.5669 (39.8 mm)
BCG 6.5KW and BTG 9.0KW
1.7047 (43.3 mm) 1.6535 (42.0 mm)
Length as installed - inches (mm)
BCG 4.0KW (outer spring)
1.3740 (34.9 mm)
(inner spring) 1.2559 (31.9 mm)
BCG 6.5KW and BTG 9.0KW 1.3740 (34.9 mm)
Tension as installed -Ibs (kg)
BCG 4.0KW (outer spring) 52.91 (24.0 kg) 51.37 (23.3 kg)
(inner spring) 18.74 (8.5 kg) 18.3 (8.3 kg)
Out-of-squareness -inches (mm) 0.059 (1.5 mm)
Valve Rocker Shaft and Rocker Arm
Rocker shaft-to-rocker arm clearance -inches (mm)
BCG4.0KW 0.0006 - 0.0024 0.0031 (0.08 mm)
(0.016 - 0.060 mm)
BCG 6.5KW and BTG 9.0KW 0.0006 - 0.0024 0.0035 (0.09 mm)
(0.16 - 0.060 mm)
Westerbeke Generators
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