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The C18 ACERT marine propulsion engine has commercial application ratings of 454-715 bhp that meet IMO II & EU Stage IIA emissions regulations, and 469-715 bhp that meet EPA Tier 3, IMO II and EU Stage IIIA emissions regulations. In addition to the benefits the C18 ACERT's advanced marine engine technology brings, you welcome aboard legendary Cat product support. No matter where your spirit of adventure takes you, rest assured the Cat Dealer Network is close by.

Power Rating

Power Range 454-715 bhp (339-533 bkW) 454-715 bhp (339-533 bkW) Less

Engine Specifications

Speed Range 1800-2100 rpm 1800-2100 rpm Less
Aspiration TA, TTA TA, TTA Less
Bore 5.7 in 145.0 mm Less
Stroke 7.2 in 183.0 mm Less
Displacement 1106.0 in³ 18.1 l Less
Rotation from Flywheel End Counterclockwise Counterclockwise Less
Configuration In-line 6, 4-Stroke-Cycle Diesel In-line 6, 4-Stroke-Cycle Diesel Less

Dimensions & Weights

Minimum Dry Weight 4000.0 lb 1814.0 kg Less
Minimum Length 73.0 in 1854.0 mm Less
Maximum Length 76.0 in 19312.0 mm Less
Minimum Height 47.2 in 1198.0 mm Less
Maximum Height 51.2 in 1300.0 mm Less
Minimum Width 44.6 in 1134.0 mm Less
Maximum Width 47.4 in 1204.0 mm Less
Maximum Dry Weight 4299.0 lb 1950.0 kg Less

Cooling System

Heat exchanger and Keel cooled options for all ratings


IMO II and EU IWW compliant for all ratings

Separate Circuit Aftercooling System

The primary advantage of the separate circuit aftercooling system (SCAC) is that no sea water circulates through the aftercooler.

Additional Ratings

Specific ratings are available that meet IMO II emissions regulations and additional ratings are available that meet both EPA Tier 3 and IMO II emissions regulations.

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