Maintenance and maintenance of automobile engine

Clean the air filter every 1 km on the asphalt road or every 2500 km on the dirt road; Replace it with a new one every 40 thousand kilometers. Cars that often drive on dusty roads should be replaced and cleaned more frequently. Check the dust cup of the air cleaner once a month. If the dust accumulated in the dust cup is more than half of the volume of the dust cup, please clean it.

There is a hot air valve operating handle on the air inlet pipe of the air cleaner. When the ambient temperature is higher than 15℃, turn the handle to the direction marked white (summer); When the ambient temperature is15 C, turn the handle plate to the direction marked yellow (winter).

Q: When should I change the gasoline filter?

A: The replacement cycle of gasoline filters for engines DA462Q, JL368Q, TJ376Q and TJ370Q is 40,000 kilometers. When replacing, be careful not to mistake the entrance and exit. The direction of the arrow on the filter indicates the direction of fuel flow.

Q: When does the engine idle speed need to be adjusted?

Answer: Whether the idle speed adjustment of mini-car engine is correct has great influence on saving fuel and reducing exhaust pollution. Therefore, it must be carefully and correctly adjusted to stabilize the idle speed and keep the engine running. The idle speed adjustment cycle of mini-car engine is every year or every 20 thousand kilometers.

Q: What state should the engine be in when the idle speed is adjusted?

Answer: Idle speed adjustment must be carried out when the ignition system works normally, the engine is trouble-free and the coolant temperature is 70 ~ 80℃.

Q: How to adjust the engine idle speed?

Answer: (1) First screw the adjusting screw of the carburetor idling mixture to the end, and then retract it for about 4 turns.

(2) Adjust the engine speed to a suitable range by adjusting the carburetor throttle adjusting screw. For TJ370Q, TJ370QA, TJ376QA and TJ370QB engines, adjust the speed to the range of 850+50r/min; DA462Q engine, the speed is adjusted to 900+50r/min; For JL368Q engine, the speed is adjusted to about 1000 rpm.

(3) Measure the exhaust emission with an exhaust gas analyzer. If the values of CO and HC in the tail gas exceed the specified values, turn the adjusting screw of idle mixture to make the exhaust gas analyzer display CO ≥ 2% and HC ≤1000 ppm.

(4) If the values of CO and HC in the tail gas meet the specified value and the idle speed deviates from the specified value, adjust the rotating speed to the specified value by adjusting the throttle adjusting screw, and then investigate according to step (3).

If the idle rotation is stable, the engine should constantly increase the speed when stepping on the accelerator; Loosen the accelerator pedal, the engine should not stall, which shows that the idle speed is normal. If the engine is unstable or flameout occurs, it is necessary to continue to adjust the idle screw until the idle speed adjustment is completed.

Q: How to check and adjust the ignition advance angle?

Answer: (1) Check and adjust the platinum contacts.

Check the platinum contacts for burn marks. If there are any traces, gently wipe them off with sandpaper or No.0 sandpaper. Because there is only a thin layer of cemented carbide on the contact surface of platinum contact, cemented carbide will be worn off after long-term use. At this time, the contact should be replaced, and the contact surface should not be less than 80%. The gap between platinum contacts is generally 0.4 ~ 0.5 mm.

(2) Check and adjust the ignition advance angle

Remove the vacuum hose in the auxiliary room from the vacuum advance compensation device, plug the two ports connected with the hose, and make the engine run at idle speed. At this time, check the ignition advance angle with the ignition timing lamp. For TJ376Q engine and TJ370Q engine, the ignition advance angle is 5+2 (850+50F/min); For JL368Q engine, the ignition advance angle is 7 (900 r/min); CFGFda462Qv motor, its ignition advance is 10+ 1 (900 rpm); For 276Q engine, the ignition advance angle is 6+2 (900 rpm).