Westerbeke 9.0 BCG Technical Manual page 109

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3. For the BCG 6.5KW and BTG 9.0KW, tighten
the thrust plate to 3.6 - 7.2 Ib-ft (0.5 - 1.0 kg-
m) and measure the clearance.
Thrust Bearing Clearance
Specified Limit: 0.0012 - 0.0051 inches
(0.15 - 0.25 mm)
Allowable Limit: 0.0118 inches 90.30 mm)
4. For the BCG 6.5KW and BTG 9.0KW, measure
the balance shaft's oil clearance.
Oil Clearance
Block Inner Bearing Diameter
Front: 1.7717 - 1.7726 inches
(45.000 - 45.025 mm)
Rear: 1.3386 - 1.3396 inches
(34.000 - 34.025 mm)
Balance Shaft Outer Diameter
Front: 1.7700 - 1.7707 inches
(44.959 - 44.975 mm)
Rear: 1.3370 - 1.3376 inches
(33.959 - 33.975 mm)
If the oil clearance is not within the allowable limit, replace the bearings or refinish the balance shaft.
Bearing Size (Under Size 0.0196 inches [0.5 mm])
Front Bearing
Rear Bearing
Block's inner diameter
1.7530 - 1.7542 inches
(44.526 - 44.556 mm)
1.3199 - 1.3211 inches
(33.526 - 33.556 mm)
103
Balance Shaft's outer
diameter
1.7516 -1.7520 inches
(44.490 - 44.500 mm)
1.3185 - 1.3189 inches
(33.490 - 33.500 mm)
Westerbeke Generators