Engine Blowby Test! Smoke Coming From Oil Cap 😳 (Bad Engine Signs)
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Checking for blow by on a diesel is more than removing just the oil cap. Blow by is when combustion pressure in the cylinder during the power stroke leaks past the piston and into the crankcase. When the oil cap is removed you can get a quick idea of crankcase pressure but it is not the full picture. You have to pinch the crankcase breather hose for a moment to force all the pressure to show at the oil fill hole. I believe that this is the best way to see the real amount of blow by without speci
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Checking for blow by on a diesel is more than removing just the oil cap. Blow by is when combustion pressure in the cylinder during the power stroke leaks past the piston and into the crankcase. When the oil cap is removed you can get a quick idea of crankcase pressure but it is not the full picture. You have to pinch the crankcase breather hose for a moment to force all the pressure to show at the oil fill hole. I believe that this is the best way to see the real amount of blow by without speci
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