how to determine blow by - Dodge Cummins Diesel Forum
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post #1 of 23 (permalink) Old 05-16-2013, 01:26 AM Thread Starter
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how to determine blow by

wanting to know how to tell if you have too much blow by? i know you can do a compression check by pretty expensive, and i've heard that just by removing oil fill cap you can check to see how much air blowing out of valve cover. Any other ways thanks


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post #2 of 23 (permalink) Old 05-16-2013, 01:35 AM
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Remove the oil filler cap and place it upside down over the hole(while its running), If it blows off a compression check is in order, if not I would not worry about it. Just my 2-cents.

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post #3 of 23 (permalink) Old 05-16-2013, 01:42 AM
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what he said, also if you exhaust smells like burnt oil.

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post #4 of 23 (permalink) Old 05-16-2013, 03:10 AM
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Blowby is normal. Especially in the ISB which is an open loop emission system engine. But in saying that, excessive blowby is either 1) worn out rings, 2) unseated rings, or 3) a vacuum leak. Since 1 would only be a problem if oil changes were performed rarely, or if the engine has many many hundreds of thousands of miles on it, I would say this is probably not the problem. And 2 being only an issue if there's less than 100k miles on the engine, which may have also been babied on nothing but high dollar synthetics at 3000 miles change intervals, I again, wouldn't think thats the problem. But 3 being a vacuum leak is more common when someone thinks they have more blowby than they're used to since any leak in vacuum is simply pumped into the crankcase and exited out the blowby vent hose.

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post #5 of 23 (permalink) Old 05-17-2013, 12:04 AM Thread Starter
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would a vacuum leak cause oil to pour out of breather since its pumped into crank case???

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post #6 of 23 (permalink) Old 05-17-2013, 12:07 AM Thread Starter
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Quote:
Originally Posted by KATOOM View Post
Blowby is normal. Especially in the ISB which is an open loop emission system engine. But in saying that, excessive blowby is either 1) worn out rings, 2) unseated rings, or 3) a vacuum leak. Since 1 would only be a problem if oil changes were performed rarely, or if the engine has many many hundreds of thousands of miles on it, I would say this is probably not the problem. And 2 being only an issue if there's less than 100k miles on the engine, which may have also been babied on nothing but high dollar synthetics at 3000 miles change intervals, I again, wouldn't think thats the problem. But 3 being a vacuum leak is more common when someone thinks they have more blowby than they're used to since any leak in vacuum is simply pumped into the crankcase and exited out the blowby vent hose.
If a vacuum leak did just get pumped into the crankcase would it cause excessive oil leaking out of breather???

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post #7 of 23 (permalink) Old 05-17-2013, 01:56 AM
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Yes, it could. Depending on how much air is being pumped into the crankcase. How much are you talking?

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post #8 of 23 (permalink) Old 05-17-2013, 11:57 AM
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...the ISB which is an open loop emission system engine...
I know this is off topic, but what does this mean?

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post #9 of 23 (permalink) Old 05-17-2013, 12:04 PM
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It is not closed like a gas vehicle, the breather is open to the air and that is the only crancase vent. Gas cars use positive crankcase ventilation through the pcv valve.

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post #10 of 23 (permalink) Old 05-17-2013, 12:11 PM
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Yes, as eforbes mentioned, all internal combustion engines must vent the crankcase. But because of emissions, most engines redirect that venting back into the intake system and recycle those gases. Thats called a "closed loop" system. The ISB is an "open loop" system and does not recycle those crankcase gases. This is the blowby we see exiting under the truck.

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post #11 of 23 (permalink) Old 05-19-2013, 11:24 AM Thread Starter
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Yes, it could. Depending on how much air is being pumped into the crankcase. How much are you talking?
after a 15 min drive i have about a 3'' puddle on the ground after parking for about two mins. When i pop the hood, you can see oil all over valve cover and leaking down side of motor

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post #12 of 23 (permalink) Old 05-19-2013, 03:04 PM
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after a 15 min drive i have about a 3'' puddle on the ground after parking for about two mins. When i pop the hood, you can see oil all over valve cover and leaking down side of motor
It sounds like maybe the adapter for the engine vent 3/4" hose on the timing gear cover is loose or leaking. I cant remember what its actually called but its about 4" round and the 3/4" vent hose comes out the top of it and curves around and points downward. The assembly simply turn locks in place. Check there, check for anything else possibly leaking in that area causing the mess.

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