Westerbeke 3.0KW BPMG-60HZ Service Manual page 27

INSPECTION AND MEASUREMENTS
POWER UNIT
Measurement with vernier calipers
• Valve seat width
Standard value
1.0mm
0.0393 in
Out of the limit to use
If 2.0 mm (0.079 in) or
more, it needs replacement
or repair.
• Valve spring free length
Standard value
35mm
1.38 in
Out of the limit to use
If 33.5 mm (1.319 in) or
less, it needs replacement.
Measurement with micrometer
• Outer diameter of piston skirt
Standard value
58.960mm
2.3213 in
Out of the limit to use
If 58.90 mm (2.3189 in) or
less, it needs replacement,
• Piston clearance (Clearance between piston
and cylinder)
Standard value Out of the limit to use
0.020 - 0.055 mrn If 0.15 mm (0.0059 in) or
0.0008 - 0.0022 in more, it needs replacement.
• Outer diameter of piston pin
Standard value Out of the limit to use
16.00mm If 15.97 mm (0.629 in) or
0.6299 in less, it needs replacement.
• Outer diameter of crank pin
Standard value Out of the limit to use
29.98mm If 29.95 mm (1.179 in) or
1.1803 in less, it needs replacement.
• Outer diameter of crank shaft in metal bearing
Standard value Out of the limit to use
31.99 mm
If 31.97 mm.(1.259 in) or
1.2594 in less, it needs replacement.
~ WESTERBEKE
Engines & Generators
20