2 parts repair machining repair electroplating cylinder wear bearing damage engine can't start the high and low voltage circuit.

Correction and repair methods include pressure, flame and impact correction.

8. Problems that should be paid attention to in machining and repairing: (1) Positioning datum (2) Rounded corners of shaft parts (3) Surface roughness of parts.

9. Electroplating is divided into chromium plating, iron plating and copper plating.

10. Cylinder wear is mainly caused by mechanical wear, corrosion wear and abrasive wear.

1 1. Inspection of piston ring end clearance, side clearance and back clearance.

12. Common damages of bearings include abrasion, abrasion, burn and fatigue peeling.

13. Valve clearance adjustment methods include cylinder-by-cylinder adjustment method and twice adjustment method.

14. Engine failed to start: 1. When starting, the engine was running normally, but there was no sign of landing.

(1) There is no oil in the fuel tank (2) The throttle valve is fully open when starting (3) The ignition system fails (4) The electric gasoline pump does not work (5) The fuel injector does not work (6) The gasoline pressure is too low (7) The engine compression pressure is too low (8) The air intake system leaks seriously.

2. When the engine is started, there are signs of the car, but the cause of the failure cannot be started.

(1) Air leakage in intake pipe (2) Incorrect ignition advance angle (3) Too weak high-pressure fire (4) Too low fuel pressure (5) Cold start injector does not work (if equipped) (6) Water temperature sensor failure (7) Air filter oil leakage or blockage (8) Air flowmeter failure (9) Fuel injector oil leakage or blockage (65438+)

15. Judging that the fault lies in the high and low voltage circuit: generally, unplug the central high voltage line from the distributor so that its end is 5-7mm away from the engine, turn on the ignition switch to turn the engine or use the starter to drive the engine to run. If the high-voltage line trips, it means that the low-voltage circuit of the ignition system is normal and the fault lies in the high-voltage circuit; If there is no flashover or weak spark, the fault is in the low-voltage circuit of the ignition system. The normal spark should be white or light blue. If the spark is red, it means the spark is weak.