Today, when cars are becoming more and more popular, the number of maintenance personnel has also increased sharply. However, many maintenance personnel always think that if they have a little technology, they will open maintenance stores hastily, resulting in more and more second-class maintenance stores outside. Especially when dismantling the car engine, many maintenance personnel will make the following mistakes, Huasheng Audi maintenance consultant takes you to have a look!

1、盲目拆掉發動機節溫器如果因發動機溫度高而盲目拆除節溫器，冷卻液只能進行大循環，不能調節冷卻強度，難以保證發動機在較適宜的溫度下工作，反而使發動機經常處于低溫狀態下工作，造成發動機功率下降，磨損快，油耗增加。如果發動機節溫器發生故障檢修或更換之后，發動機溫度還高，就應檢修冷卻系統的其他部位，不能拆除節溫器。

1. Remove the engine thermostat blindly. If the thermostat is removed blindly due to the high engine temperature, the coolant can only carry out large circulation and cannot adjust the cooling intensity. It is difficult to ensure that the engine works at a more appropriate temperature. On the contrary, the engine often works at a low temperature, resulting in reduced engine power, rapid wear and increased fuel consumption. If the engine temperature is still high after troubleshooting or replacement of the engine thermostat, overhaul other parts of the cooling system and do not remove the thermostat.

2、發動機溫度怕高不怕低有些人認為行車時發動機溫度怕高不怕低。其實，發動機溫度低時危害性也很大。應根據汽車使用說明書規定的正常溫度行車，才能保證發動機的使用壽命。

2. The engine temperature is afraid of high and not afraid of low. Some people think that the engine temperature is afraid of high and not afraid of low when driving. In fact, when the engine temperature is low, it is also very harmful. The service life of the engine can be guaranteed only by driving at the normal temperature specified in the vehicle operation manual.

3、水泵風扇皮帶越緊越好皮帶越緊并非越好。皮帶過緊不僅會使其拉長或斷裂，縮短皮帶的使用壽命，而且還會因拉力過大，導致發電機軸、水泵軸變形彎曲和軸承的早期損壞。汽車發動機風扇皮帶的松緊度應符合技術要求，一般正常皮帶裝配時撓曲度為10-15mm為宜。

3. The tighter the water pump fan belt, the better. The tighter the belt, the better. Too tight belt will not only lengthen or break the belt and shorten the service life of the belt, but also lead to deformation and bending of generator shaft and water pump shaft and early damage of bearings due to excessive tension. The tightness of automobile engine fan belt shall meet the technical requirements. Generally, the deflection during normal belt assembly is 10-15mm.

4、發動機用怠速升溫用怠速升溫時，由于轉速較低，機油泵不能較快地將潤滑油壓入各潤滑表面，油壓也低，使發動機各運動機件在干摩擦或半干摩擦狀態下工作；燃油因低溫霧化不良，使未燃燒的燃油竄入曲軸箱，沖刷掉缸壁上的油膜，也會加速機件的磨損。所以，發動機啟動數秒后，應用快怠速升溫，發動機的潤滑條件。

4. When the engine is heated at idle speed, due to the low speed, the oil pump can not quickly put the lubricating oil pressure into each lubricating surface, and the oil pressure is also low, so that all moving parts of the engine work under dry friction or semi dry friction; Due to poor low-temperature atomization of fuel, unburned fuel flows into the crankcase and washes off the oil film on the cylinder wall, which will also accelerate the wear of parts. Therefore, after the engine is started for a few seconds, apply the fast idle speed to raise the temperature and the lubrication conditions of the engine.

5、用噴燈烘烤油底冬季用噴燈烘烤油底，不但會使機油中的添加劑發生化學變化，失去原有的性能，而且還會使機油膠結、油底變形，容易引起火災。更好的做法是根據當地冬季的低氣溫選用相適應的機油。在有條件的地方，把車輛停放在有保溫設施的車庫內。

5. Baking the oil bottom with a blowtorch in winter will not only cause chemical changes in the additives in the engine oil and lose the original performance, but also cause engine oil cementation and oil bottom deformation, which is easy to cause fire. The better way is to select the appropriate engine oil according to the local low air temperature in winter. Where possible, park the vehicle in the garage with thermal insulation facilities.

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