Checking The Connecting Rods - Westerbeke 9.0 BCG Technical Manual

Standard End Gap Clearance
Compression ring No.1: 0.0079 - 0.0157 inches (0.20 - 0.40 mm)
Compression ring No.2: 0.0079 - 0.0157 inches (0.20 - 0.40 mm)
BCG 4.0KW Oil ring: 0.0079 - 0.0354 inches (0.20 - 0.90 mm)
BCG 6.5KW and BTG 9.0KW Oil ring: 0.0079 - 0.0315 inches (0.20 - 0.80 mm)
3. Measure the side clearance between the
piston ring and ring groove.
NOTE: Measure the clearance
around the total circumference of the
ring groove.
Standard Side Clearance
Compression Ring No.1 :
0.0012 - 0.0028 inches
(0.03 - 0.07 mm)
Compression Ring No.2:
0.0008 - 0.0014 inches
(0.02 - 0.06 mm)
Allowable Side Clearance Limit:
0.0047 inches (0.12 mm)
Checking the Connecting Rods
1. Check the side of each connecting rod's small end and large end for cracks or damage. If necessary,
replace damaged connecting. rods.
2. Check the connecting rod for bends or twists
with a suitable alignment fixture. If realignment
is necessary, place the connecting rod in a
press and apply a gradual pressure to the rod
or replace the connecting rod.
Allowable Limit (per 3.937 inches (100 mm)
Bend: BCG 4.0KW 0.0031 inches
(0.08 mm)
BCG 6.5KW and BTG 9.0KW
0.0020 inches (0.05 mm)
Twist: BCG 4.0KW 0.0039 (0.10 mm)
BCG 6.5KW and BTG 9.0KW
0.0020 inches (0.05 mm)
Westerbeke Generators
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