0316602 JOHNSON SCREW, Throttle step

Troubleshooting
Troubleshooting can be difficult. On the following pages there is a list of possible problems. To make a repair to a problem, make reference to the cause and correction.This list of problems, causes and corrections, will only give an indication of where a possible problem can be, and what repairs are needed. Normally, more or other repair work is needed beyond the recommendation in the list.Remember that a problem is not normally caused only by one part, but by the relation of one part with other parts. This list can not give all possible problems and corrections. The service personnel must find the problem and its source, then make the necessary repairs.Troubleshooting Problem List
1. Engine Crankshaft Will Not Turn When Start Switch Is On.2. Engine Will Not Start. Governor Terminal Shaft Does Not Move.3. Engine Will Not Start. Governor Terminal Shaft Moves.4. Engine Overspeeds On Start.5. Engine Speed Does Not Have Stability.6. Engine Misfiring Or Running Rough.7. Engine Stall At Low RPM.8. Not Enough Power.9. Too Much Vibration.10. Loud Combustion Noise.11. Valve Train Noise (Clicking).12. Oil In Cooling System.13. Fuel In Cooling System.14. Mechanical Noise (Knock) In Engine.15. Fuel Consumption Too High.16. Loud Valve Train Noise.17. Too Much Valve Lash.18. Valve Rotocoil Or Spring Lock Is Free.19. Oil At The Exhaust.20. Little Or No Valve Lash.21. Engine Has Early Wear.22. Coolant In Lubrication Oil.23. Too Much Black Or Gray Smoke.24. Too Much White Or Blue Smoke.25. Engine Has Low Oil Pressure.26. Engine Uses Too Much Lubrication Oil.27. Engine Coolant Is Too Hot.28. Alternator Gives No Charge.29. Alternator Charge Rate Is Low Or Not Regular.30. Alternator Charge Too High.31. Alternator Has Noise.32. Exhaust Temperature Too High.33. Air Starter Motor Does Not Turn.34. Air Starter Motor Turns Slowly Or Has A Loss Of Power.35. Air Starter Motor Pinion Does Not Engage With The Flywheel.36. Air Starter Motor Runs, Pinion Engages But Does Not Turn The Flywheel.37. Air Starter Motor Pinion Does Not Engage Correctly With The Flywheel.38. Electric Starter Motor Does Not Turn.Troubleshooting Problems
Problem 1: Engine Crankshaft Will Not Turn When Start Switch Is On Probable Cause:1. Problem With Air Starter Motor Make reference to Problem 33.2. Problem With Electric Starter Motor Make reference to Problem 38.3. Problem With Engine Protective System Make reference to Electric Protective System, SENR2984 or SENR2985, or make reference to Hydra Mechanical Protective System, SENR3078.4. Inside Problem Prevents Engine Crankshaft From Turning If the crankshaft can not be turned after disconnecting the driven equipment, remove the fuel injectors and check for fluid in the cylinders while turning the crankshaft. If fluid in the cylinders is not the problem, the engine must be disassembled to check for other inside problems. Some of these inside problems are bearing seizure, piston seizure, or valves making contact with the pistons. Problem 2: Engine Will Not Start - Governor Terminal Shaft Does Not Move To Open Injector Racks Probable Cause:1. Too Much Binding In Control Linkage Engine can start cold, but with hot oil, governor does not develop enough oil pressure to move linkage. Check linkage effort and correct.2. No Signal To Actuator Solenoid Make reference to 2301 Electric Governor, SENR2928.3. Low Oil Pressure In Actuator The actuator oil pump relief valve may be stuck open or leaking. Correct by governor disassembly and cleaning. Problem 3: Engine Will Not Start - Governor Terminal Shaft Opens At Least Half Way Or More At Cranking As Observed By Outboard Shaft Rotation Probable Cause:1. Slow Cranking Speed Make reference to Problem 29.2. Low Quality Fuel Or Water In Fuel Remove fuel from the tank, lines and fuel manifolds. Install new fuel filters and put a good grade of clean fuel in the fuel tank. Use priming pump to fill system with fuel and to remove air.3. No Fuel To Injectors Check fuel level in fuel tank and fill if necessary. Use priming pump to remove any air from the fuel system.Install new fuel filters if necessary. Blocked or broken fuel lines should be cleaned or replaced. Check the fuel transfer pump for damage or wear and make replacements as needed.Governor linkage not connected to internal rack linkage (such as improper assembly during overhaul). Make sure governor linkage is correctly engaged.4. Fuel Pressure Is Low At starting rpm, the minimum fuel pressure from fuel transfer pump must be 20 kPa (3 psi). If fuel pressure is less than 20 kPa (3 psi) change the fuel filters. Look for air in the fuel system. If fuel pressure is still low, check the fuel bypass valve and the fuel transfer pump for correct operation.5. Wrong Fuel Injection Timing Make adjustment to timing. See subject, Fuel Timing. Problem 4: Engine Overspeeds On Start Probable Cause:1. Fuel Control Linkage Improper assembly after overhaul, linkage not free, bound up in fuel-on position, governor output lever not connected to rack fork lever. Make repairs or replacements as needed.2. Governor Or Actuator Problem Make reference to 2301 Electric Governor, SENR2928. Problem 5: Engine Speed Does Not Have Stability Probable Cause:1. Engine Misfiring Make reference to Problem 6.2. Linkage Is Binding, Or Worn With Flat Spots And High Clearances Inspect and repair or replace linkage as needed.3. Governor Problem Make reference to 2301 Electric Governor, SENR2928. Problem 6: Engine Misfiring Or Running Rough Probable Cause:1. Fuel Pressure Is Low Make sure there is fuel in the fuel tank. Look for leaks or bad bends in the fuel line between fuel tank and fuel transfer pump. Look for air in the fuel system, sticking, binding or defective fuel bypass valve. Check fuel pressure. The outlet pressure of the fuel transfer pump must be a minimum of 415 kPa (60 psi) at full load speed. The pressure in both fuel manifolds must be 415 to 450 kPa (60 to 65 psi). If fuel pressure is lower than the above pressure, install new filters. If fuel pressure is still low, check the fuel transfer pump and fuel pressure regulator valve at the fuel manifold.2. Air In Fuel System Find the air leak in the fuel