UENR0623-02 21 Engine Operation The coolant then flows into the housing of the water temperature regulator (2). If the water temperature regulator is closed, the coolant goes directly through a bypass to the inlet side of the water pump. If the water temperature regulator is open, and the bypass is closed then the coolant flows to the top of the radiator (1). The hub of the idler gear is lubricated by oil from the oil gallery. The timing gears are lubricated by the splash from the oil. Engines have piston cooling jets that are supplied with oil from the oil gallery. The piston cooling jets spray lubricating oil on the underside of the pistons in order to cool the pistons.
i04169606 Lubrication System i04169852 Electrical System Lubricating oil from the oil pan flows through a strainer and a pipe to the suction side of the engine oil pump. Pressure for the lubrication system is supplied by the oil pump. The crankshaft gear drives a lower idler gear. The lower idler gear drives the oil pump gear. The pump has an inner rotor and an outer rotor. The axis of rotation of the rotors are off- center relative to each other. There is an interference fit between the inner rotor and the drive shaft. The electrical system is a negative ground system. The charging circuit operates when the engine is running.
The alternator in the charging circuit produces direct current for the electrical system. Starting Motor The inner rotor has four lobes which mesh with the five lobes of the outer rotor. When the pump rotates, the distance increases between the lobes of the outer rotor and the lobes of the inner rotor in order to create suction. When the distance decreases between the lobes, pressure is created. The starting motor turns the engine via a gear on the engine flywheel. The starting motor speed must be high enough in order to initiate a sustained operation of the fuel ignition in the cylinders. The ignition switch is deactivated once the desired engine speed has been achieved.
The circuit is disconnected. The armature will stop rotating. Return springs that are located on the shafts and the solenoid will disengage the pinion from flywheel ring gear back to the rest position. The lubricating oil flows from the outlet side of the oil pump through a passage to a plate type oil cooler. The oil cooler is located on the right side of the cylinder block. The lubricating oil flows from the oil cooler through a passage to the oil filter head. The oil then flows through a bypass valve that permits the lubrication system to function if the oil filter becomes blocked. Under normal conditions, the oil then flows to the oil filter.
The armature of the starting motor and the mechanical transmissions may be damaged if the increases in the speed of the engine are greater than the pinion of the starting motor. Damage may occur when the engine is started or after the engine is started. An overrunning clutch prevents damage to the armature of the starting motor and mechanical transmissions. The oil flows from the oil filter through a passage that is drilled across the cylinder block to the oil gallery. The oil gallery is drilled through the total length of the left side of the cylinder block. Alternator The electrical outputs of the alternator have the following characteristics:
Lubricating oil from the oil gallery flows through high- pressure passages to the main bearings of the crankshaft. Then, the oil flows through the passages in the crankshaft to the connecting rod bearing journals. The pistons and the cylinder bores are lubricated by the splash of oil and the oil mist. Three-phase Full-wave Rectified Lubricating oil from the main bearings flows through passages in the cylinder block to the journals of the camshaft. Then, the oil flows from the front journal of the camshaft at a reduced pressure to the cylinder head. The oil then flows through the center of the rocker shaft to the rocker arm levers.
Oil flows to the hydraulic lash adjusters in the rocker arm levers. The valve stems, the valve springs and the valve lifters are lubricated by the splash and the oil mist. The alternator is an electro-mechanical component. The alternator is driven by a belt from the crankshaft pulley. The alternator charges the storage battery during the engine operation. The alternator is cooled by an external fan which is mounted behind the pulley. The fan may be mounted internally. The fan forces air through the holes in the front of the alternator. The air exits through the holes in the back of the alternator.