Checking The Crankshaft - Westerbeke 9.0 BCG Technical Manual

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5. Measure the connecting rod width.
Standard Rod Width: 0.8583 - 0.8602 inches
(21.80 - 21.85 mm)
Checking the Crankshaft
1. Check the crankshaft for cracks or other damage. If
necessary, replace the crankshaft.
2. Check to see that the oil passages of the crankshaft
are open. If any clogs are found, remove them with
compressed air or a suitable wire.
3. Check the crankshaft for eccentric wear; that is, see if
the journals have become elliptical or tapered. If it ex-
ceeds the allowable limit, compensate for this wear by
grinding the bearing journals and replace the bearings
with undersized bearings.
NOTE: Measure the diameter of each of the
crankpins and main journals at two points (the front
and rear portions) at 90 degrees to the crankshaft
axis, as shown in the figure.
Allowable elliptical or tapered Limit:
0.0008 inches (0.02 mm)
Specified Oil Clearance: (All Models) 0.008 - 0.0017 inches (0.020 - 0.044 mm)
Allowable Limit: BCG 4.0KW: 0.0031 inches 90.08 mm)
BCG 6.5KW and BTG 9.0KW:
0.0028 inches (0.07 mm)
4. If the journals must be ground because of severe burning or scoring, grind the crankshaft and replace the
crankshaft bearings with undersized bearings.
Main Journal
Outer Diameter
Crankpin Journal
Outer Diameter
Standard Repair limit 1.6526 - 1.6535 inches 1.5739 - 1.5748 inches
(41.976 - 42.000 mm) (39.976 - 40.000 mm)
Undersize 0.0098 inches 1.6430 - 1.6434 inches 1.5642 - 1.5646 inches
(0.25 mm) (41.732 - 41.742 illm) (39.732 - 39.742 mm)
Undersize 0.0196 inches 1.6331 - 1.6335 inches 1.5544 - 1.5548 inches
(0.50 mm) (41.482 - 41.492 mm) (39.482 - 39.492 mm)
97 Westerbeke Generators