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there are many causes of blow by. these are listed as follows

1. the main cause is piston rings. the compressed gases past the piston rings and enter the crankcase . so parameters like ring waviness , thickness , tensile strength should be checked.

2. valve seat , gasket , injector seating place should be checked because these parameters also increase blow by.

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Q: What are the causes of Blow By in a diesel engine?
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