Troubleshooting and Diagnosis: The motorcycle Crankshaft manufacturer tells you that the excessive pressure of the lower exhaust gas (crankcase exhaust gas) of the diesel engine is one of the common faults of the diesel engine. There are many reasons for the excessive pressure of the exhaust gas in the crankcase of the diesel engine, mainly as follows:

(1) The piston ring or cylinder liner is severely worn. The motorcycle Crankshaft manufacturer tells you that if the piston rings or cylinder liner are severely worn, the seal between the piston and cylinder liner is not tight. During the compression and expansion process of the diesel engine, a large amount of compressed gas will enter the crankcase through the tiny gap between the ring and the cylinder liner, resulting in an increase in the exhaust gas pressure of the crankcase.
The motorcycle Crankshaft manufacturer tells you that this condition is accompanied by severe exhaust under the breather, insufficient diesel engine power, and possibly blue smoke.
(2) Piston ring counterpart. The motorcycle Crankshaft manufacturer tells you that although the piston rings are not worn, if the openings of the rings are all aligned, a large amount of high-pressure gas will enter the crankcase during the compression and expansion process, resulting in increased crankcase exhaust pressure.
The motorcycle Crankshaft manufacturer tells you that this situation will be accompanied by the following phenomena: heavy exhaust under the diesel engine, increased oil consumption, and blue smoke may be emitted from the exhaust.
The above information is the motorcycle Crankshaft manufacturer's introduction and analysis of the structure of what are the reasons for high crankcase exhaust pressure, hope it helps you.