MANIFOLD 2P3622 - Caterpillar

Basic Engine Troubleshooting
Introduction
For Specifications with illustrations, make reference to Specifications For 3176B Marine Engine, SENR6507. If the Specifications in SENR6507 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, SENR6500.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.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, SENR6500. Problem 2: Fuel Consumption Too High Probable Cause:1. Fuel Consumption Errors Follow high fuel consumption check list:* Fuel measured correctly* Comparison to other marine applications* Different marine craft or 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. Fuel And Combustion Noise (knock) Refer to 3176B Electronic Troubleshooting, SENR6500.6. Wrong Timing Position Sensor Calibration Refer to 3176B Electronic Troubleshooting, SENR6500. 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, SENR6500. 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