Westerbeke 7.0 KW BGC -60Hz Technical Manual page 33

Specified Value Allowable
Umit
Cylinder Block
Upper gasket surface distortion 0.0020 0.0031
(0.05 mm) (0.08 mm)
Cylinder block height 9.2874 - 9.2953
9.2834
(235.9 - 236.1 mm) (235.8 mm)
Cylinder bore
2.6220 - 2.6232 0.0039
(66.60 - 66.63 mm)
(0.1 mm)
Cylinder out of roundness and taper
0.0012
(0.03 mm)
Piston, Piston Pin, and Piston Ring
Piston to cylinder clearance 0.0016 - 0.0024 0.004
(0.040 - 0.060 mm) (0.11 mm)
Piston ring end gap compression No. 1 0.0098 - 0.0157
0.0256
(0.25 - 0.40 mm) (0.65 mm)
Piston ring end gap compression No.2 0.0079 - 0.0138 0.0256
(0.20 - 0.35 mm) (0.65 mm)
Piston ring end gap oil 0.0079 - 0.0276 0.0394
(0.20 - 0.70 mm) (1.00 mm)
Piston ring side clearance compression No. 1
0.0012 - 0.0028 0.0047
(0.03 - 0.07 mm) (0.12 mm)
Piston ring side clearance compression No.2 0.0008 - 0.0024 0.0043
(0.02 - 0.06 mm) (0.11 mm)
Piston outer diameter 2.6201 - 2.6213
(66.550 - 66.580 mm)
Piston inner diameter for piston pin 0.7086 - 0.7090
(17.999 - 18.008 mm)
Piston pin outer diameter 0.7083 - 0.7087
(17.991 - 18.000 mm)
Piston to piston pin clearance 0.0002 - 0.0004
0.0020
(0.005 - 0.011 mm) (0.050 mm)
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Westerbeke Generators