981744 Volvo.Penta Hex. socket screw

Troubleshooting Index
1. Engine Will Not Turn When Start Switch Is On.2. Engine Will Not Start.3. Misfiring Or Running Rough.4. Stall At Low rpm.5. Sudden Changes In Engine rpm.6. Not Enough Power.7. Too Much Vibration.8. Loud Combustion Noise.9. Loud Noise (Clicking) From Valve Compartment.10. Oil In Cooling System.11. Mechanical Noise (Knock) In Engine.12. Fuel Consumption Too High.13. Loud Noise From Valves Or Valve Operating Components.14. Little Movement Of Rocker Arm And Too Much Valve Clearance.15. Valve Rotocoil Or Spring Lock Is Free.16. Oil At The Exhaust.17. Little Or No Valve Clearance.18. Engine Has Early Wear.19. Coolant In Lubrication Oil.20. Too Much Black Or Gray Smoke.21. Too Much White Or Blue Smoke.22. Engine Has Low Oil Pressure.23. Engine Uses Too Much Lubrication Oil.24. Engine Coolant Is Too Hot.25. Exhaust Temperature Is Too High.26. Starter Motor Does Not Turn.27. Alternator Gives No Charge.28. Alternator Charge Rate Is Low Or Not Regular.29. Alternator Charge Is Too High.30. Alternator Has Noise.31. Shutoff Solenoid Does Not Stop Engine. Problem 1: Engine Crankshaft Will Not Turn When Start Switch Is On Probable Cause:1. Battery Has Low Output: Make Reference to Problem 27.2. Wires Or Switches Have Defect: Make Reference to Problem 27.3. Starter Motor Solenoid Has A Defect: Make Reference to Problem 26.4. Starter Motor Has A Defect: Make Reference to Problem 26.5. Inside Problem Prevents Engine Crankshaft From Turning: If the crankshaft cannot be turned after the drive equipment is disconnected, remove the fuel nozzles and check for fluid in the cylinders while the crankshaft is turned. 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, wrong pistons installed in the engine, and valves making contact with pistons. Problem 2: Engine Will Not Start Probable Cause:1. Slow Cranking Speed: Make reference to Problem 27.2. No Fuel In The Housing For The Fuel Injection Pumps: Fill the housing for the fuel injection pumps with fuel with the priming pump. Remove the air with the bleed valve.3. Dirty Fuel Filter: Install new fuel filter.4. Dirty or Broken Fuel Lines: Clean or install new fuel lines as necessary.5. No Fuel To Cylinders: Put fuel in fuel tank. "Prime" (remove the air and/or low quality fuel from the fuel system).6. Bad Quality Fuel: Remove the fuel from the fuel tank. Install a new fuel filter element. Put a good grade of clean fuel in the fuel tank.7. Fuel Has "Cloud Point" Higher Than Atmospheric Temperature ("Cloud Point" = Temperature Which Makes Wax Form In Fuel): Drain the fuel tank lines, and fuel injection pump housing. Change the fuel filter. Fill the tank with fuel which has the correct "cloud point" and remove the air from the system with the priming pump.8. Wrong Fuel Injection Timing: Make adjustment to timing.9. Overfueling Spring Not Inltalled: Install overfueling spring. Problem 3: Misfiring Or Running Rough Probable Cause:1. Air In The Fuel System: Find air leak in the fuel system and correct. Remove air from fuel system. See Fuel System in Testing and Adjusting.2. 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. Check fuel pressure at the fuel injection pump housing. If fue pressure at high idle is lower than 105 kPa (15 psi), install a new filter element. If fuel pressure is still low, check the