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 43.1 in
Height 35.1 in
Minimum Width 31.4 in
Maximum Width 33.5 in
Minimum Engine Dry Weight 1609 lb
Maximum Engine Dry Weight 1676 lb
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 4.13 in
Stroke 5.31 in
Displacement 428 in³
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

Contact us


Do you have questions or need advice? We are happy to help.


  • Call
  • Arrow

Request an quotation

Banner - Contact Sticky Desktop Banner - Contact Sticky Mobile
  • Call
  • Arrow

Call us

During office hours available from 08.00 - 18.00.



We respond within 24 hours.

How would you like us to contact you? *

Please fill the form below and I will contact you as soon as possible.

How would you like us to contact you? *