Cat C7.1 Tier 3 / IMO II

Auxiliary Engines

About the Cat C7.1 Tier 3 / IMO II


C7.1 Marine Auxiliary Engine (U.S. EPA Tier 3 / IMO II)


Dimensions & Weights
Length 1095 mm
Height 891 mm
Minimum Width 798 mm
Maximum Width 850 mm
Minimum Engine Dry Weight 730
Maximum Engine Dry Weight 760
Power Rating
Power Range 208 bkW (280 bhp) @ 2300 rpm
Engine Specifications
Configuration In-line 6, 4-stroke-cycle diesel
Emissions U.S. EPA Tier 3 / IMO II emissions certified (commercial), RCD 2016 compliant, EU Stage IIIA compliant, CCNR Stage II through reciprocity with EU Stage IIIA
Rated Engine Speed 2300 rpm
Bore 105 mm
Stroke 135 mm
Displacement 7.01 l
Aspiration Turbocharged-aftercooled aspiration
Governor Electronic (A5E2 V2 ECM)
Refill Capacity Lube Oil System w/Oil filter change: 20 L (5.3 gal)
Oil Change Interval 500 hrs
Cooling Heat exchanger or keel cooled
Flywheel Housing SAE No. 03 with SAE 11.5 in flywheel
Rotation Counterclockwise from flywheel end



Reliability & Durability

Reliability & Durability
Superior response time and acceleration; 12V or 24V electrical system; Gear driven jacket water pump and sea water pump for superior reliability; Maintenance free valve train with hydraulic valve lash adjusters

Easy to use

Easy to use
Compatible with Cat® displays and electronics; Self priming fuel system ensures a smooth start every time

Environment friendly

Environment friendly
No visible smoke; Common rail fuel system enables optimum combustion and low emissions; Reduced combustion noise through advanced electronic control; Closed crankcase ventilation system improves engine room cleanliness

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