Causes of excessive pressure on crankcase exhaust of diesel engine (1)

- Nov 12, 2018 -

软文插入常用

One of the common faults of diesel engine is that the lower exhaust (crankcase exhaust) is too large.There are many reasons for the high pressure of diesel crankcase exhaust gas.


1. Piston rings or cylinder sleeves are severely worn.

Concomitant phenomenon: the exhaust under respirator is serious, diesel engine power is insufficient, blue smoke may also occur.If the piston ring or cylinder sleeve is seriously worn, the sealing between the piston and cylinder sleeve is not tight. In the compression and expansion process of diesel engine, a large amount of compressed gas will enter the crankcase through the tiny gap between the ring and cylinder sleeve, which leads to the increase of crankcase exhaust gas pressure.


2. Piston ring counterpart.

Concomitant phenomenon: diesel exhaust under serious, oil consumption increased, exhaust may emit blue smoke.Although the piston ring is not worn, if all the openings of the ring are opposite, a large amount of high-pressure gas will enter the crankcase in the process of compression and expansion, resulting in increased crankcase exhaust gas pressure.


3. The piston ring sticks or breaks.

Concomitant phenomenon: high pressure of crankcase exhaust, blue smoke from diesel engine, lack of power, abnormal noise inside cylinder.Piston ring adhesion, breakage or loss of flexibility will lead to cylinder sealing lax, combustion gas flow into the crankcase, crankcase increased pressure.


4. The top of the piston is ablated or drawn.

Concomitant phenomena: abnormal sound of diesel engine, black smoke coming from exhaust, lack of power or the engine can not turn.Serious ablation of the top of the piston or pull the cylinder, the cylinder will lose its seal, crankcase gas pressure increases to natural.


5. Crankcase respirator malfunction

Concomitant phenomena: abnormal sound of diesel engine, black smoke coming from exhaust, lack of power or the engine can not turn.Serious ablation of the top of the piston or pull the cylinder, the cylinder will lose its seal, crankcase gas pressure increases to natural.


6. Crankcase respirator malfunction.

(1) Failure of respirator membrane or (respirator) piston.Damage to the membrane or piston of the respirator will result in the loss of balance between the crankcase and the atmosphere, resulting in the increase of the exhaust volume of the crankcase due to the pressure difference between the internal and external.

Concomitant phenomenon: oil consumption increases, exhaust blue smoke is serious, but has no effect on power.

(2) Blockage of tiny air holes in the air balance of the air breather: the blockage of tiny air holes in the air balance of the respirator and atmosphere will result in the inability of the crankcase to maintain balance between the air and the inner part of the crankcase.

Concomitant phenomenon: oil consumption increases, exhaust blue smoke is serious, but has no effect on power.