Engine 3-cylinder camshaft cover is not oiled, timing belt is broken
Vehicle failure: The oil passage of the 3-cylinder camshaft cover is not oiled, resulting in poor lubrication of the camshaft, and the timing belt is stressed. A cold car emits a slight white smoke, and the antifreeze is made up for about half a month and half a liter.
This southeast bun was introduced by a friend of Fat Brother. The unit car is mainly used to pull heavy goods. It is rarely seen on the road now, the cars are relatively small, and the design is relatively unique.
The machine cover is the same as a sealed and flat-headed Foton Jinbei van.
According to the owner’s description:
The car is waiting for the red light to start, and the engine is ready to shift to 2nd gear Suddenly it turned off, and then the owner tried many times without getting on the car.
Rescue site troubleshooting:
Pang arrived at the scene and turned on the oil cap, and then started the vehicle and found that the camshaft did not rotate, indicating that the timing belt was broken, and whether the valve was topped or not. determine.
How to judge whether the valve is up?
Turn the camshaft to observe the position of the center of the 1 cylinder intake and exhaust camshaft, so that the 1 cylinder intake and exhaust valves are in a closed state. Then remove the spark plug, screw on the special air pipe, and blow with your mouth. If the pressure is relieved when blowing, it means that the valve is pushed to cause air leakage. Unfortunately, the camshaft of this car cannot be screwed with a wrench and is stuck.
Maintenance steps:
First, disassemble the valve cover and observe why the camshaft is stuck.
Observing from the broken marks, the timing belt should be broken by a hard pull.
The timing belt looks good, and there is no aging and cracking on the surface.
The inside of the belt has begun to crack.
Single camshaft with 16 valves, the surface of the camshaft looks pretty good.
Remove the tile cover for inspection.
Pang found a lot of wear on the heads of the 3-cylinder. Obviously, the oil is not lubricated.
Camshaft.
Tiled.
Pang brother's summary: camshaft wear is caused by the blockage of the oil passage under the camshaft, which leads to poor oiling and wears over time. If the oil is not good, the cylinder head needs to be replaced, and the camshaft and tile cover are too worn and need to be replaced.
Lift down the cylinder head to check the valve.
The valve is intact and has no traces of topping.
Observing from the traces of the cylinder head gasket, cylinders 1 and 2, and cylinders 3 and 4 are a little bit back and forth between cylinders.
Asbestos mat.
There is no carbon deposit on the piston surface and no valve Top wound marks.
According to the owner, this engine has lifted the cylinder head for the third time. The first time was that the engine was locked and stalled due to an oil leak at the bottom of the chassis, and the second time was that the high-temperature cylinder head gasket rushed.
After communicating with the car owner, he suggested to replace the cylinder head assembly, although the old valve has no roof. However, the newly replaced cylinder head needs to be twisted, and 16 valves are too expensive to be twisted down, so it is better to replace the cylinder head assembly. The first can solve the problem of not being able to use the 3 cylinders, and the second can solve the problem of slight water heating in the engine and white smoke from the engine when the engine is cold.
A set of new cylinder head assembly, the price can be slightly more expensive than 465.
Start the installation.
The specific installation sequence will not be described one by one. The cylinder head screws must be tightened.
Pang Brother concluded: The belt break is only a superficial problem. The main reason is that the 3 cylinder cylinder head is not oiled and the camshaft is stuck, but the belt is broken. The maintenance cost is about 1,000 yuan, including oil and antifreeze.
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