What is the problem with the low cylinder pressure in the truck?

The truck-hanging cylinder pressure is an important factor for the normal operation of the engine. After the engine is used for a period of time, the cylinder compression pressure may be low. The causes of the low cylinder pressure are as follows: the backlash of the piston ring, the open end clearance is too large, or the mounting position of the air ring opening is changed, resulting in deterioration of the airtightness of the cylinder. The gap between the piston and the cylinder worn over the ambassador is increased, and the piston oscillates in the cylinder and cannot form a good seal with the cylinder. When the compression pressure of the cylinder is low, it will make the engine start difficult and the vehicle will be unable to move. Therefore, the maintenance should be carried out in time.

By gumming piston ring, the piston ring groove carbon deposit in the card, so that the elastic Crane ring itself can not play, we lost the first sealing surface of the gas ring and the cylinder wall. Unmatched piston installed. If there is a different depth of the top pit of the piston selected for the engine, the cylinder pressure will be affected when used wrongly. Cylinder liner damage, loose valve seat, valve spring break or lack of elasticity, valve and valve catheter due to coke or gap is too small, so that the valve up and down movement blocked, check the cylinder head gasket leakage, if necessary, to replace, Cause valve sealing is not strict.

Timing with the wrong crane gear installation, gear keyway is not correct, the timing gear is damaged or worn too much, the camshaft timing wheel hub and wheel loose, etc., resulting in incorrect valve timing. Mismatched cylinder heads are used. If some cylinder heads may have different combustion chamber volumes, incorrect loading can affect the cylinder pressure. Inadequate adjustment of intake and exhaust valve clearances, loose seals with valve seats, or improper operation when testing cylinder pressure. In the engine equipped with a decompression device, the gap of the decompression device was improperly adjusted to make the valve close.

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