Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel
2
Model WP3.9C53E1 WP3.9C61E1
Type
Water-cooled, vertical, in-line, four-stroke
Apiration
Natural aspiration
No of cylinder - Bore×Stroke mm
4-102×118
Total displacement L 3.86
Compression ratio
17.5 ：1
Mean effective pressure kPa
590.7 590.7
Mean piston speed m/s
7.87 7.87
Rated output kW
38 38
Rated Speed r/min
2000 2000
Fuel consumption at rated power
[g/kW
·
h）]
≤235
Oil consumption %
≤0.5
Speed droop %
≤5
Low idle speed r/min
750～800
Firing order 1-3-4-2
Lubricating method
Combination of pressure and splash
Cooling method Pressurized water-cooling
Starting method
Electric
Dry weight kg
440
Overall dimensions
L(mm) 1084
W(mm)
718
H(mm)
890
*Dimension to flywheel housing end
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