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Old 06-25-2016, 09:29 AM   #1
Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 2,627
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
IHC DT engine no blow by?

as I keep workign on and learnign my way around a diesel engine.. I had been reading that all diesel engines need to "breathe" and they do so by way of a breather tube or some call a Blow-by tube.. .

my neighbor says thats how the crankcase pressure is relieved ion mechanical engines like mine so that it doesnrt blow all of the seals out of the engine..

a couple people told me its normal to see "smoke" coming out of this tube and all diesels do it..

I located my Breather tube.. pointed at the ground on the side of the engine.... i started the engine and there is nothing coming out of that tube whatsoever... no air no smoke no steam no notrhing coming out of that pipe..

is that normal or is my pipe likely clogged up?

I do have a slight oil seep (I see wetness around the rear main and occasionally a couple drops of oil on the ground but my oil level stays high and my exhaust doesnt smoke)...

do your guys diesels smoke from this breather pipe?

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Old 06-25-2016, 11:38 AM   #2
Bus Nut
Join Date: May 2016
Location: Georgia
Posts: 374
Year: 1987
Coachwork: Carpenter
Chassis: IH
Engine: IH 9 Liter
Rated Cap: 66 + driver
You may not see anything at all at idle. Might see a little something at high idle. Bet you'd see something at 1500+ RPM's under a load, like when it's being driven. Many newer engines may not have this breather tube open toward the ground, it would be routed to the intake system and burned.
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Old 06-25-2016, 03:15 PM   #3
Bus Nut
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Join Date: May 2016
Location: Richmond Virginia
Posts: 567
Year: 1984
Engine: 366 Big block Chevy! :) w/ Stick shift
I only notice crankcase smoke or fog after a motor has been run for a stint. Then that will show up.
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Old 06-25-2016, 06:16 PM   #4
Bus Crazy
Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
Posts: 1,146
Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
As mentioned, there will be blow by when the engine is under load. Exhaust + oil can also be seen coming out of the hose when the pistons are no longer sealing well (low engine compression).
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Old 06-28-2016, 09:09 AM   #5
Bus Nut
Join Date: May 2014
Location: West Ohio
Posts: 403
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Pull the oil fill cap while it's running to check if it's plugged. Otherwise I wouldn't be overly concerned about it.
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