3500C Marine Engines Caterpillar

The 3500 C Marine Engines are electronically controlled diesel engines. The engines have electronic unit injectors. The engines can be equipped with either separate circuit aftercooling or jacket water aftercooling. The engines are offered in a 12 cylinder engine and a 16 cylinder engine.

Engine efficiency and engine performance depend on adherence to proper operation and maintenance recommendations. Use the recommended fuels, lubrication oils, and coolant. Pay special attention to the air cleaner, to the fuel system, to the lubrication system, and to the cooling system maintenance. Refer to the Operation and Maintenance Manual, "Maintenance Interval Schedule" for more information on maintenance items.

Table 1

3500C Engine Specifications
Item	3512C	3516C
Rated speed (rpm)	1800 RPM
Cylinders and arrangement	60 degree Vee 12	60 degree Vee 16
Bore	170 mm (6.7 inch)
Stroke	215 mm (8.5 inch)
Type	4-stroke cycle
Compression ratio(1)	14.7:1
Compression ratio(2)	14.0:1	n/a
Aspiration	Turbocharged
Method of cooling the turbocharged air	Separate circuit aftercooling
Displacement per cylinder	4.9 L (297.2 in3)
Total displacement	58.5 L (3570 in3)	78 L (4760 in3)
Rotation (flywheel end)	Counterclockwise rotation
Fuel	See this Operation and Maintenance Manual, "Fluid Recommendations".
Method of fuel injection	Electronic fuel injectors
Method of starting	Electric starting motor or air starting motor
Exhaust back pressure (design)	3.35 kPa (13.47 inch of H2O)
Maximum allowable back pressure	6.7 kPa (26.92 inch of H2O)
Maximum inlet air restriction	6.2 kPa (25.3 inches of H2O)

(1)	Except for serial numbers beginning with T3W
(2)	Serial numbers beginning with T3W

Illustration 1	g00308167
3512C Engine (A) Inlet valves (B) Exhaust valves (C) Flywheel

Illustration 2	g00308357
3516C Engine (A) Inlet valves (B) Exhaust valves (C) Flywheel