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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Quick tip for checking diesel engine blow by. A lot of sellers just pull the oil cap, make a video and call it a test, but that alone doesn’t tell you much. To really check blow by, you need to find the crankcase breather and pinch it closed while the oil cap is off. If pressure builds and you get heavy vapor pushing out, that’s a sign of blow by. A light haze is normal on a healthy diesel. This is a simple check you can do in minutes before buying a used truck. #diesel #mechanic #enginerepair #
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