CRANKSHAFT/PISTON TROUBLESHOOTING Excessive noise 1. Crankshaft Worn main bearing Worn rod bearing 2. Piston and Connecting Rod Worn piston or cylinder Worn piston pin or pin hole Worn rod small end Low compression or uneven compression 1. Worn cylinder or piston ring Excessive smoke 1. Worn cylinder, piston or piston rings 2. Improperly installed piston rings 3. Damaged piston or cylinder Overheating 1. Excessive carbon build-up on piston head 2. Blocked or restricted flow of coolant 3. Sticking thermostat Knocking or abnormal noise 1. Worn pistons and cylinders 2. Excessive carbon build-up on piston head. 168 Date of Issue: January, 1982 C) HONDA MOTOR CO., LTD. 1 2- 2