0338950 EVINRUDE RETAINER, Vacuum switch

Introduction
For Specifications with illustrations, make reference to Specifications For 3176B Engine, SENR6462. If the Specifications in SENR6462 are not the same as in the Systems Operation, Testing and Adjusting, look at the printing date on the back cover of each book. Use the Specifications given in the book with the latest date.Troubleshooting can be difficult. The Troubleshooting Index gives a list of possible problems. To make a repair to a problem, see the possible cause and corrective action on the pages that follow. Also, check the 3176B Electronic Troubleshooting, SENR6497.This list of problems, causes and corrections will only give an indication of where a possible problem can be, and what repairs are needed.Service personnel may remember similar complaints which were corrected by a previous method of troubleshooting. However, just because the complaint is the same the cause for the complaint can be different.Be sure to get a good description of the problem from the operator and/or the person who owns the vehicle. What they tell you about the problem can save you time and make the repair job faster and easier.Troubleshooting Problem List
1. Loud Combustion Noise2. Fuel Consumption Too High3. Too Much Black Or Gray Smoke4. Too Much White Smoke5. Too Much Blue Smoke6. Engine Has Low Oil Pressure7. Engine Overheating8. Engine Excessive Cooling9. Coolant Leaks Outside Of Engine10. Coolant Leaks At The Overflow Tube11. Coolant Leakage Inside EngineTroubleshooting Problems
Problem 1: Loud Combustion Noise Probable Cause:1. Poor Quality Or Water In Fuel Follow the recommendations given in Special Instruction, SEHS7067, Fuel Recommendations For Caterpillar Diesel Engines. Also, Special Instruction, SEHS6947 has fuel correction factors and tables.2. Wrong Timing Position Sensor Calibration Refer to 3176B Electronic Troubleshooting, SENR6497. Problem 2: Fuel Consumption Too High Probable Cause:1. Fuel Consumption Errors Follow high fuel consumption check list:* Miles measured correctly* Fuel measured correctly* Comparison to other industrial applications* Different engine specifications* Different operating loads* Different operating modes2. Poor Quality Or Water In Fuel Follow the recommendations given in Special Instruction, SEHS7067, Fuel Recommendations For Caterpillar Diesel Engines. Also, Special Instruction, SEHS6947 has fuel correction factors and tables.3. Fuel System Leaks Inspect the fuel system for leaks and make repairs or replacements as needed.4. Excess Idle Time Shut engine off when not in use.5. Excessive Speeds Or Operation At High Engine Speeds Reduce speed and follow progressive shifting guidelines.6. Fuel And Combustion Noise (knock) Refer to 3176B Electronic Troubleshooting, SENR6497.7. Wrong Timing Position Sensor Calibration Refer to 3176B Electronic Troubleshooting, SENR6497. Problem 3: Too Much Black Or Gray Smoke Probable Cause:1. Not Enough Air For Combustion Check for a plugged air cleaner element or blockage in the air lines. Follow the procedures in the Testing and Adjusting section to check inlet manifold pressure and aftercooler core leakage.2. Wrong Timing Position Sensor Calibration Refer to 3176B Electronic Troubleshooting, SENR6497. Problem 4: Too Much White Smoke Probable Cause:1. Too Much Oil In Engine Do not put too much oil in the crankcase. If the oil level in the crankcase goes up as the engine is used, check for fuel in the crankcase. Make repairs or replacements to the fuel injection lines and nozzles as needed to keep fuel out of the crankcase.2. Engine Misfires Or Runs Rough Check items listed in Problem No. 3. Refer to 3176B Electronic Troubleshooting, SENR6497.3. Wrong Timing Position Sensor Calibration Refer to 3176B Electronic Troubleshooting, SENR6497.4. Coolant In Combustion System Coolant in the combustion chamber can cause white smoke. A cracked cylinder head or liner, also a bad cylinder head gasket are possible causes for this condition. Problem 5: Too Much Blue Smoke1. Failed Turbocharger Oil Seal Check inlet manifold and aftercooler core for oil. Make a repair or replacement of the turbocharger as needed.2. Worn Valve Guides See the Specifications module for the maximum permissible wear of the valve guides.3. Worn Piston Rings Worn piston rings and/or cylinder walls can be the cause of blue smoke and can cause a loss of compression. Make a visual inspection of the cylinder walls and piston rings. If necessary, measure the cylinder walls and piston rings. For the cylinder and piston ring specifications, see the Specifications module. High wear at low mileage is normally caused by dirt coming into the engine with the inlet air. Problem 6: Engine Has Low Oil Pressure Probable Cause:1. Low Engine Oil Level Check engine oil level and fill to proper level.2. Oil Leaks Check for loose oil filter or oil supply lines, etc.3. Dirty Oil Filter Or Cooler Core Check the operation of bypass valve for the filter. Install new oil filter elements if needed. Clean or install new oil cooler core. Remove dirty oil and fill the engine with clean oil to the correct level.4. Diesel Fuel In Lubricating Oil Find the place where diesel fuel gets into the lubrication oil. Make repairs as needed. Remove any oil that has diesel fuel in it. Install new oil filters and fill the engine with clean oil to the correct level.5. Too Much Clearance Between Rocker Arm Shaft And Rocker Arms Check for correct lubrication in valve compartment. Install new parts as necessary.6. Oil Pump Suction Pipe Has A Defect. Replacement of the pipe is needed.7. Relief Valve For Oil Pump Does Not Operate Correctly Clean valve and housing. Install new parts as necessary.8. Oil Pump Has A Defect Make a repair or replacement of the oil pump as needed.9. Too Much Clearance Between Camshaft And Camshaft Bearings Install new camshaft and camshaft bearings if necessary.10. Too Much Clearance Between Crankshaft And Crankshaft Bearings Inspect the bearings and crankshaft journals and make repairs and replacements as necessary.11. Too Much Bearing Clearance For Idler Gear Inspect bearings and make replacements as necessary.12. Piston Oil Cooling Jet Tubes Not Installed Install piston oil cooling jet tubes.13. Defective Oil Pressure Gauge Replace oil pressure gauge Problem 7: Engine Overheating Probable Cause:1. Low Coolant Level If the coolant level is too low, not enough coolant will go through the engine and radiator. This lack of coolant will not take