What Is Blowby? What Is Too Much Blowby?
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Published 2016-03-26
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All Comments (21)
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This was very helpful. Thanks, i was trying to gauge how bad my 04 5.9 was.
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Thanks great info, I work on much larger engines (c175) and trucks 793f/d) but still very informative.
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This is my first time viewing your videos and I have to say I am now a fan! Great info! I used to work on Caterpillar truck engines in late 90's early 2000's and have seen this myself. I remember getting some with a scored cylinder pack that would puff fumes out of the blowby tube every time that cylinder fired. I miss working on these engines since I have been out of the game for almost 12 years but I am slowly working back into it looking to re-start my career in diesel repair.
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Your videos have been very helpful I just wish I had seen them sooner. There is a lot of things some shops can't check but they won't tell you or they don't know how. They were also enlightened. At my expense.
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I’m currently in diesel technology school as we speak this channel help me with everything I’m a fan till day I die lol you really don’t understand how much this has help me
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Thought I'd mention that different engine manufactures run this test differently, i.e. idle no load to high idle no load. Just so the viewer knows but depending on engine manufacture you can have other causes of high blowby. Such as a bad air-compressor. A leaking intake manifold/valve cover gasket bad oil seperator. It's getting to the point now a days that the rule of thumb is getting thrown out the window. Love your videos keep them coming. :)
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Very informative. Thanks for posting! 🙌
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Great videos. I deal with CAT engines all day in the military so it was pretty awesome stumbling across your channel.
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Hi Josh :) Again a lot of useful informations ! My 3208 has a little of blowby from the crankcase breather. Not so much, but there is. I have the valve lash to do (quite 3000 hours on the engine clock) and I guess it was never rebuilt. I just ordered an oil sample analysis to see what's going on.
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I have also heard that if you removed the oil fill cap - and feel strong puffs of air coming out of the oil fill hone (with engine running) - that often means the rings are bad.
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Thanks for the good info mine dont look bad after that lass one in the vid!
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Remind me of a truck at work, had blowby as bad as the RV and burned 8 gallons of oil a day. They used it that way for about 10 months
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Great information I have a question about blow-by. What if you have blow-by at idle and it goes away when you Rev up your engine. What could be the cause? Thanks
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Very informative. Keep em coming.
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Nice explanations,thanks; And if the crankcase is pressurized,the oil cannot drain down from the turbo? and ends up in the intake pipes,and then,you have a lot of blue smoke from the exhaust? And,that can lead to engine RUNAWAY???!!
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A turbo may cause crankcase pressure but by definition is not blow by. Blow by is literally gases blown by the rings in a cylinder.
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Thanks for the tips! How long did the owner/driver run the RV like this? What % of power do you believe was lost? Fuel mileage percentage?
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Thanks man for valuable info.
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My c7 has a lot of blowby only at a cold start. It only has about 185k miles currently. My mechanic said to just keep up on the oil level and it should hold up. What's your take on this?
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I know nothing about engines but removed my oil filler cap on my diesel and it was puffing air out like a steam train. No smoke or colour, just air and oil.
