CYLINDER HEAD AS 7S7070 - Caterpillar

The 3512B Marine Auxiliary Engine is an electronically controlled diesel engine. The engine drives a generator in order to produce electrical power.Engine Specifications
Table 1
3512B Marine Auxiliary Engine Specifications
Item 3512B Engine
Rated rpm 1800
Low idle rpm 900
Cylinders and arrangement 60 degree Vee 12
Bore 170 mm (6.7 inch)
Stroke 190 mm (7.5 inch)
Type 4 stroke cycle
Compression ratio 14:1
Aspiration Turbocharged
Method of cooling the turbocharged air Jacket water aftercooling
Displacement per cylinder 4.3 L (263 in 3 )
Total displacement 51.8 L (3158 in 3 )
Rotation (flywheel end) Counterclockwise
Fuel See this Operation and Maintenance Manual, "Fuel Recommendations" (Maintenance Section).
Method of fuel injection Electronic unit injectors
Method of starting Air starting motor
Exhaust back pressure (design) 2.5 kPa (10 inches of H2O)
Maximum allowable exhaust back pressure 5.9 kPa (20 inches of H2O)
Maximum allowable air inlet restriction 6.2 kPa (25 inches of H2O)
Inlet valve lash 0.50 mm (0.020 inch)
Exhaust valve lash 1.00 mm (0.039 inch)
Illustration 1 g00308167
3512B Engine design
(A) Inlet valve
(B) Exhaust valve
(C) Flywheel