CAMSHAFT AS 7W5426 - Caterpillar

The engine is an electronically controlled mechanically actuated unit injector diesel engine. The engine is configured as a twin turbocharged jacket water aftercooler with electronic unit injection. Some engines may have one turbocharger. The single turbocharger is mounted in the rear of the engine. The engine views that are shown are of the engine with two turbochargers.The Electronic Unit Injector system eliminates many of the mechanical components that are traditionally used in the fuel injector assembly. The Electronic Unit Injector (EUI) also provides increased control of the timing and the fuel air mixture. The timing advance is achieved by precise control of the fuel injection timing. Engine rpm is controlled by adjusting the injection duration. These features lower the smoke level for emissions under all operating conditions.The engine has built-in diagnostics in order to ensure that all of the components are operating properly. In the event of a system component failure, the operator will be alerted to the condition by a warning lamp or a diagnostic lamp. The check engine light is located in the pilot house. An electronic service tool can be used to read the numerical code of the faulty component or condition. Intermittent faults are logged and stored in memory.
Illustration 1 g01430948
Right side view of engine
(1) Control panel
(2) Air cleaner service indicator
(3) Air cleaner
(4) Expansion tank filler cap
(5) Expansion tank
(6) Heat exchanger
(7) Water pump (jacket water)
(8) Alternator belt tightener
(9) Alternator
(10) Circuit breaker/reset
(11) Fuel filter
(12) Fuel priming pump
(13) Engine oil filter
(14) Marine transmission oil cooler
(15) Electric starting motor
(16) Engine oil filler
(17) Manual sump pump
(18) Engine oil level gauge (dipstick)
(19) Engine oil cooler
Illustration 2 g01430949
Left side view of engine
(20) Aftercooler
(21) Air cleaner
(22) Air filter restriction indicator
(23) Flywheel housing
(24) Aftercooler condensate drain valve
(25) Electronic control module (ECM)
(26) Filter for crankcase ventilation system
(27) Filter change indicator
(28) Fuel transfer pump
(29) Auxiliary water pump Starting the Engine
The Electronic Control Module (ECM) will automatically provide the correct amount of fuel that is necessary to start the engine. The throttle should not be held while the engine is being cranked. If the engine fails to start in 30 seconds, the starter switch should be released. The electric starting motor needs to be cooled for two minutes before the electric starting motor is used again.
Excessive ether (starting fluid) can cause piston and ring damage. Use ether for cold weather starting purposes only.
Cold Mode Operation
The ECM will set the cold start strategy when the coolant temperature is below 18 °C (64 °F).When the cold start strategy is activated, low idle rpm will be increased to 1000 rpm and engine power will be limited.Cold mode operation will be deactivated when any of the following conditions have been met:
Coolant temperature reaches 18 °C (64 °F).
The engine has been running for fourteen minutes.Cold mode operation varies the fuel injection amount for white smoke cleanup. Cold mode operation also varies the timing for white smoke cleanup.After the cold mode is completed, the engine should be operated at low rpm until normal operating temperature is reached. The engine will reach normal operating