19674A 1 Mercury SWITCH ASSEMBLY, Lanyard

Troubleshooting Problem List
The Engine Crankshaft Will Not Turn When The Start Switch Is On.
The Engine Will Not Start.
The Engine Is Misfiring Or The Engine Is Running Rough.
The Engine Stalls At Low RPM.
There Are Sudden Changes In Engine RPM.
The Engine Does Not Have Enough Power.
The Engine Has Too Much Vibration.
The Engine Has A Loud Combustion Noise (Knock).
The Engine Has a Valve Train Noise (Clicking).
Oil Is In The Cooling System.
Mechanical Noise (Knock) Is In The Engine.
Fuel Consumption Is Too High.
The Engine Has A Loud Noise From The Valves Or The Valve Operating Components.
Little Movement Of The Rocker Arm And Too Much Valve Lash Is Present.
The Valve Rotocoil Or The Spring Lock Is Free.
Oil Is At The Exhaust.
Little Valve Lash Or No Valve Lash Is Present.
The Engine Has Early Wear.
Coolant Is In The Lubrication Oil.
Too Much Black Smoke Or Gray Smoke Is Present.
Too Much White Smoke Or Blue Smoke Is Present.
The Engine Has Low Oil Pressure.
The Engine Uses Too Much Lubrication Oil.
The Engine Coolant Is Too Hot.
The Exhaust Temperature Is Too High.
The Starting Motor Does Not Turn.
The Alternator Gives No Charge.
The Alternator Charge Rate Is Low Or Irregular.
The Alternator Charge Is Too High.
The Alternator Has Noise.
The Shutoff Solenoid Does Not Stop The Engine.
The Contactor Switch For The Water Temperature Does Not Activate The Shutoff Solenoid.
The Contactor Switch For The Water Temperature Activates The Shutoff Solenoid At The Wrong Temperature.
The Contactor Switch For The Oil Pressure Fails To Activate The Shutoff Solenoid.
The Shutoff Solenoid Fails To Stop The Engine.
The Shutoff Solenoid Prevents The Engine From Starting.
The Clutch Will Not Engage Or The Clutch Heats. The Lever Moves To The Released Position.
The Clutch Shaft Has Too Much End Play.
The Clutch Bearings Have Short Service Life.
The Mechanical Shutoff Fails To Stop The Engine Because Of Low Oil Pressure.
The Mechanical Shutoff Does Not Stop The Engine When The Coolant Temperature Is Too High.
The Mechanical Shutoff Will Not Allow The Engine To Start.
The Electrical Indicators Give Wrong Readings.
The Automatic Start/Stop System Lacks The Supply Of Standby Current And The Lockout Light Is Activated.
The Automatic Start/Stop System Lacks The Supply Of Standby Current And The Lockout Light Is Not Activated.
The Supply Of The Standby Current Of The Automatic Start/Stop System Stops Before The Normal Current Returns.
The Standby System Of The Automatic Start/Stop System Is Operating And The Standby Current Is Not Needed.Troubleshooting Problems
Problem 1
The Engine Crankshaft Will Not Turn When The Start Switch Is On.Probable Cause
Low Output From The BatteryRefer to "Problem 27".
Defective Wires or SwitchesRefer to "Problem 27".
Defective Starting Motor SolenoidRefer to "Problem 26".
Defective Starting MotorRefer to "Problem 26".
An Internal Problem Prevents The Turning Of The Engine Crankshaft.If the crankshaft cannot be turned after disconnecting the driven equipment, inspect the cylinders for fluid while the crankshaft is being turned. If fluid in the cylinders is not the problem, the engine must be disassembled. After disassembling the engine, inspect the engine for other internal problems. Possible internal problems include the following conditions:
Bearing seizure
Piston seizure
Valve and piston contactProblem 2
The Engine Will Not Start.Probable Cause
Slow Cranking SpeedRefer to "Problem 27".
No Fuel In The Housing For The Fuel Injection PumpsUse the priming pump in order to fill the housing for the fuel injection pumps with fuel. Remove the air with the purge valve.
Dirty Fuel FilterInstall a new fuel filter.
Broken Fuel Lines Or Dirty Fuel LinesNew fuel lines should be cleaned or installed, as required.
No Fuel To The CylindersPut fuel in the fuel tank. Prime the fuel system.
Low Quality Fuel Or Water In FuelRemove fuel from the fuel tank. Install a new fuel filter element. Put a good grade of clean fuel in the fuel tank. Refer to Supplement, SEBD0717, "Diesel Fuels and Your Engine". Also, refer to Special Instruction, SEHS6947 for more information on fuel correction factors and tables.
The Fuel Has A "Cloud Point" That Is Higher Than The Atmospheric Temperature. (The "Cloud Point" Is The Temperature That Causes Wax To Form In Fuel.)Drain the fuel tank, the lines and the fuel injection pump housing. Change the fuel filter. Fill the tank with fuel that has the correct "cloud point". Use the priming pump in order to remove air from the system.
Wrong Fuel Injection TimingMake an adjustment to the timing.
No Installation Of Overfueling SpringInstall the overfueling spring.
Defective Shutoff SolenoidRefer to "Problem 36".Problem 3
The Engine Is Misfiring Or The Engine Is Running Rough.Probable Cause
Air In Fuel SystemFind the air leak in the fuel system and correct the air leak. If there is air in the fuel system, the air generally enters the fuel system on the suction side of the fuel transfer pump. Remove the air from the fuel system. Refer to the Testing and Adjusting, "Fuel System" topic.
Low Fuel PressureThe fuel pressure at the outlet of the fuel filter housing must be a minimum of 105 kPa (15 psi) at high idle. If fuel pressure is lower than the above pressure, check the following items:
Plugged fuel filters
Fuel transfer pumpEnsure that there is fuel in the fuel tank. Look for leaks or bends in the fuel line between the fuel tank and the fuel transfer pump. Look for air in the fuel system. Also look for a defective return fuel pressure regulating valve.
Leakage Or Breakage In Fuel Line Between Fuel Injection Pump And Fuel Injection NozzleInstall a new fuel line.
Defect In Fuel Injection Nozzle(s) Or Fuel Injection Pump(s)Run the engine at an rpm that gives the maximum misfiring or rough running. Then, loosen a fuel line nut on the fuel injection nozzle for each cylinder one at a time. When a fuel line nut is loosened, the misfiring or rough running will increase. If loosening a fuel line nut does not affect the misfiring or rough running, test the fuel injection pump and the fuel injection nozzle for that cylinder. Install new parts, if necessary.
Wrong Fuel Injection TimingMake the adjustment to the timing, if necessary.