Westerbeke 9.0 BCG Technical Manual page 59

Specified Value Allowable Limit
Cylinder Block
Top gasket surface distortion - inches (mm)
0.0020 (0.05mm)
Cylinder bore wear - inches (mm)
BCG4.0KW 0.0031 (0.08 mm)
BCG 6.5KW and BTG 9.0KW 0.0039 (0.10 mm)
Cylinder bore out-of-roundness, taper 0.0031 (0.08 mm)
Piston, Piston Pin, and Piston Ring
Piston-to-cylinder clearance - inches (mm)
BCG4.0KW 0.0018 - 0.0026 0.0039 (0.10 mm)
(0.045 - 0.065 mm)
BCG 6.5KW and BTG 9.0KW 0.0014 - 0.0022 0.0039 (0.10 mm)
(0.035 - 0.055 mm)
Piston ring end gap - inches (mm)
Compression No.1 and NO.2 0.0079 - 0.0157 0.0276 (0.70 mm)
(0.2 - 0.4 mm)
Oil 0.0079 - 0.0315
0.0433 (1.10 mm)
(0.2 - 0.8 mm)
Piston ring side clearance -inches (mm)
Compression No.1 0.0012 -0.0026 0.0047 (0.12 mm)
(0.03 - 0.07 mm)
Compression No.2 0.0008 - 0.0024 0.0047 (0.12 mm)
(0.02 - 0.06 mm)
Piston outer diameter - inches (mm)
BCG4.0KW
2.8167 - 2.8179
(71.545 - 71.575 mm)
BCG 6.5KW and BTG 9.0KW 2.9903 - 2.9915
(75.955 - 75.985 mm)
Piston-to-piston pin clearance - inches (mm) 0.0002 - 0.0004 0.0008 (0.02 mm)
(0.005 - 0.011 mm)
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