Hiace belt slipping sound

90 year Toyota · Hiace model: U-LH 102V engine model: 2L transmission: FR5MT mileage: 130,000km

Goods receipt at the request of “I want the belt to be repaired as it sounds slippery.” By inspection at the time of receipt, I noticed somewhat strange things from the tension of the belt driving the alternator which is the generator of the engine. Because the belt was just replaced.

In the story of the user, since the slippery sound of the belt is concerned, when consulting with the gasoline station when refueling is given, it is said that “Since the belt is sliding, let’s adjust the state of tension so that we can adjust it” When I got it, I heard that the sound was not disappeared even if it was adjusted, so it was said that it would be the life of the belt, so that it was replaced with a new belt.

However, even if it was exchanged for a new item, the sliding sound of the belt did not stop, the mechanics of the gas station was troubled and it was told that we should consult a maintenance shop.


If this belt is tightened too much, it causes breakage of the pulley bearing of the alternator. However, a sound comes out with the belt stuck. Besides that, it is thought that sound is generated according to the clogging of the oil pump of the engine main body and the sound according to it is thought as the source of this abnormal sound, but it seems that this time it is not like this this time.

So, with the alternator drive belt removed, driving the engine and looking at it turned out noises. That means that if there is a cause of the engine itself the sound will not stop, the cause is not the engine itself, it will be the pulley sliding sound that surely turns through the belt itself or the belt.

Normally, when the belt is replaced with a new one, the sound comes out when exchanged with the proper tension condition is to say that the pulley is not the belt itself, but the cause. So, as you check the pulley alone, the crank pulley was peeling off the torsional damper and the outer circumference of the pulley for absorbing “twist” generated from the crankshaft while the engine was running.


Immediately after purchasing a new crank pulley and exchanging it, installing the belt in a proper state with proper tension and then starting the engine, the belt slipping sound was eliminated and it became a smooth engine sound. This is the completion of maintenance


Fortunately this time I was able to prevent the accident such as pulley bearing damage such as alternator, but there is a great possibility of it, first of all, unless the automobile maintenance factory side firmly reflects that we could not be consulted from the user at first It became one case to feel it would not be.


Belts and pulleys that operate devices called auxiliaries of the engine body such as alternators, air conditioner compressors, and power steering pumps rotate by driving a “crank pulley” about the crankshaft which is the center of the engine body. So if you stretch the belt too tightly, pulley bearings of each accessory will be damaged and you will fall into a non-rotatable case, or if the torsional damper of the crankshaft pulley body will be damaged like this time, this case is another manufacturer It is a common failure case also in vehicles of.

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