Check the cylinder pressure to understand the overall situation of the cylinder seal, but to grasp the specific location of the cylinder leakage, but also for further examination. Generally can use the cylinder leak detector to carry out, in the absence of this equipment, the easiest way is to use compressed air to check.
The operation steps
First, the engine temperature to normal operating temperature (80 degrees C). Can also be checked immediately after the cylinder compression force, but should pay attention to the car parked on the flat ground.
Remove all fuel injectors.
The Baotou Benz crankshaft crank parts to the first cylinder piston in the compression end position (i.e. TDC).
Baotou North Benz parts of the transmission rod into the low gear, and tighten the parking brake, to ensure that the compressed air into the cylinder after the piston does not move down.
The compressed air to 590kPa above the pressure from the fuel injector into the cylinder bore Chutong. In order to ensure that the pressure of the gas source is not leaking, the air pressure gauge on the cylinder pressure gauge can be removed. Then, the head of the cylinder pressure measuring meter is pressed in the hole of the injector seat, and the gas source switch is opened.
The method of diagnosis
In the north of Baotou Benz parts water tank water inlet view, if there is a bubble out, indicating that the cylinder and the water jacket between the cylinder gasket leakage.
The adjacent cylinder injector seat hole to leak sound, the two cylinder cylinder is connected, are washed out by.
Remove the air filter, listen to the intake pipe, there is a leak sound, indicating that the cylinder inlet valve is not sealed and leakage.
In the exhaust pipe to listen to, there is a leak sound, indicating that the cylinder exhaust valve is not tight.
The slow hand brake, turn the crankshaft so that the piston from TDC to move downward, in the oil outlet to leak sound always large and small changes, indicates that the piston ring or ring wear serious. If the sound from small to large, it shows that the cylinder wear cone.