30750790 Volvo.Penta Piston cooling jet

Cylinder Block
Illustration 1 g02323355
Typical example
The cast iron cylinder block for the C7.1 (Mech) engine has six cylinders which are arranged in-line. The cylinder block is made of cast iron. The cylinder block provides support for the full length of the cylinder bores. The cylinder bores are machined into the block.The cylinders are honed to a specially controlled finish in order to ensure long life and low oil consumption.The cylinder block has seven main bearings which support the crankshaft. Thrust washers are installed on both sides of number 6 main bearing in order to control the end play of the crankshaft. The thrust washers can only be installed one way.Passages supply the lubrication for the crankshaft bearings. These passages are machined into the cylinder block.Cooling passages are cast into the cylinder block in order to allow the circulation of coolant.The cylinder block has a bush that is installed for the front camshaft journal. The other camshaft journals run directly in the cylinder block.The engine has a cooling jet that is installed in the cylinder block for each cylinder. The piston cooling jet sprays lubricating oil onto the inner surface of the piston in order to cool the piston.A multi-layered steel (MLS) cylinder head gasket is used between the engine block and the cylinder head in order to seal combustion gases, water, and oil.Cylinder Head
Illustration 2 g02260115
Typical example
(1) Valve keepers
(2) Valve spring retainer
(3) Valve spring The engine has a cast iron cylinder head (4). The lower part of the inlet manifold is integral within the cylinder head. There is one inlet valve and one exhaust valve (5) for each cylinder.The ports for the inlet valves are on the left side of the cylinder head. The ports for the exhaust valves are on the right side of the cylinder head. The valve stems move in valve guides that are machined into the cylinder head. There is a renewable oil seal that fits over the top of the valve guide.Pistons, Rings, and Connecting rods
Illustration 3 g02212753
Typical example
The pistons (9) have a Quiescent combustion chamber in the top of the piston in order to provide an efficient mix of fuel and air. The piston pin (8) is off-center in order to reduce the noise level. The position pin (8) is retained in the correct position by two circlips (3).The pistons have two compression rings (1) and an oil control ring (2). The groove for the top ring has a hard metal insert in order to reduce wear of the groove. The piston skirt has a coating 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 connecting rods (4) are machined from forged molybdenum steel. The connecting rods have bearing caps (6) that are fracture split. Two connecting rod bearings (5) are installed between the connecting rod (4) and the bearing cap (6). The bearing caps on fracture split connecting rods are retained with Torx bolts (7). Connecting rods with bearing caps that are fracture split have the following characteristics:
The splitting produces an accurately matched surface on each side of the fracture for improved strength.
The correct connecting rod must be installed with the correct bearing cap. Each connecting rod and bearing cap have an unique serial number. When a connecting rod is assembled the serial numbers for the connecting rod and bearing cap must match.Crankshaft
Illustration 4 g02260273
Typical example
(1) Crankshaft gear
(2) Crankshaft
(3) Thrustwasher The crankshaft is a chromium molybdenum steel forging. The crankshaft has seven main journals. Thrust washers are installed on both sides of number 6 main bearing in order to control the end play of the crankshaft.The crankshaft changes the linear energy of the pistons and connecting rods into rotary torque in order to power external equipment.A gear at the front of the crankshaft drives the timing gears. The crankshaft gear turns the idler gear which then turns the following gears:
Camshaft gear
Fuel injection pump
The idler gear is driven by the crankshaft gear which turns the gear of the lubricating oil. Lip type seals are used on both the front of the crankshaft and the rear of the crankshaft.Vibration Damper
Illustration 5 g02260014
Typical example
(1) Damper setscrews
(2) Vibration damper
(3) Setscrews for the adapter
(4) Crankshaft adapter and pulley The force from combustion in the cylinders will cause the crankshaft to twist. This is called torsional vibration. If the vibration is too great, the crankshaft will be damaged. The vibration damper is filled with viscous fluid in order to limit the torsional vibration.Gears and Timing Gear Case
Illustration 6 g01334473
Typical example
The crankshaft oil seal is mounted in the aluminum timing case. The timing case cover is made from pressed steel.The timing gears are made of steel.The crankshaft gear drives an upper idler gear and a lower idler gear. The upper idler gear drives the camshaft and the fuel injection pump. The lower idler gear drives the oil pump. The water pump drive gear is driven by the fuel injection pump gear. The camshaft and the fuel injection pump rotate at half the engine speed.Camshaft
The engine has a single camshaft. The camshaft is made of cast iron. The camshaft lobes are chill hardened.The camshaft is driven at the front end. As the camshaft turns, the camshaft lobes move the valve system components. The valve system compo