801405625 Mercury KEY

Illustration 1 g03343017
Typical example
(1) Secondary fuel filters
(2) Crankcase breather
(3) Oil sample valve
(4) Electronic control module
(5) Oil filter
(6) Oil gauge (dipstick)
(7) Oil drain valve
(8) Oil filler cap Note: The engine can have a filtered breather (30) installed.
Illustration 2 g03343019
Typical example
(9) Coolant outlet
(10) Water pump
(11) Coolant intake
(12) Vibration damper
(13) Belt tensioner
(14) Belt
(15) Belt idler roller pulley
Illustration 3 g03343041
Typical example
(16) Exhaust manifold
(17) Front lifting eye
(18) Alternator
(19) Refrigerant compressor
(20) Turbocharger
(21) Starting motor
(22) Solenoid for starting motor
(23) Flywheel
(24) Flywheel housing
(25) Rear lifting eye
Illustration 4 g03343046
Typical example
(26) Electric priming pump
(27) Primary fuel filter
(28) Mechanical priming pump
(29) Primary fuel filter
(30) Spin on crankcase breather Note: Some components may be supplied loose.The C7.1 diesel engine is electronically controlled. The C7.1 engine has an Electronic Control Module (ECM) that receives signals from the fuel injection pump and other sensors in order to control the electronic unit injector. The fuel injection pump supplies fuel to the fuel manifold (Rail). The fuel manifold (rail) distributes fuel to the electronic unit injectors.The six cylinders are arranged in-line. The cylinder head assembly has two inlet valves and two exhaust valves for each cylinder. The ports for the exhaust valves are on the right side of the cylinder head. The ports for the inlet valves are on the left side of the cylinder head. Each valve has a single valve spring.Each cylinder has a piston cooling jet that is installed in the cylinder block. The piston cooling jet sprays engine oil onto the inner surface of the piston in order to cool the piston. The pistons have a Quiescent combustion chamber in the top of the piston in order to achieve clean exhaust emissions. The piston pin is off-center in order to reduce the noise level.The pistons have two compression rings and an oil control ring. The groove for the top ring has a hard metal insert in order to reduce wear of the groove. The skirt has a layer of graphite in order to reduce the risk of seizure when the engine is new. The correct piston height is important in order to ensure that the piston does not contact the cylinder head. The correct piston height also ensures the efficient combustion of fuel which is necessary in order to conform to requirements for emissions.The crankshaft has seven main bearing journals. End play is controlled by thrust washers which are located on both sides of the number 6 main bearing.The timing case is made of aluminum or cast iron. The timing gears are stamped with timing marks in order to ensure the correct assembly of the gears. When the number 1 piston is at the top center position of the compression stroke, the marked teeth on the idler gear will align with the marks that are on the fuel injection pump gear, the camshaft gear, and the gear on the crankshaft. There are no timing marks on the rear face of the timing case.The crankshaft gear turns the idler gear which then turns the following gears:
the camshaft gear
the accessory drive gear (if equipped)
the fuel injection pump gear
the water pump gearThe camshaft and the fuel injection pump run at half the rpm of the crankshaft.The fuel injection pump that is installed on the left side of the engine is gear-driven from the timing case. The fuel transfer pump is driven by the fuel injection pump. The fuel transfer pump draws fuel from the primary fuel filter. The fuel transfer pump delivers the fuel to the secondary filter. The fuel then travels to the fuel injection pump.The fuel injection pump increases the fuel to a maximum pressure of 190 MPa (27557 psi). The fuel injection pump delivers the fuel to the fuel manifold (Rail). The fuel injection pump is not serviceable. The engine uses speed sensors and the Electronic Control Module to control the engine speed.For the specifications of the C7.1 engine, refer to the Specifications, "Engine Design".