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 10-24-2006, 21:03 Post: 136279
rgpbeme



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Hi I have talked about my little B7200 before I wanted to know what causes blow by. Mine blows alot. It is worse at idle. I even have some oil drops coming out the tube. The tractor runs great has plenty of power and the exhaust is clean. The oil is at the right level and it uses hardly any oil. You can pinch the overflow tube and it will blow the dip stick out
Thanks Ron






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 10-24-2006, 21:38 Post: 136281
earthwrks

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Sounds like a worn or broken piston ring. I had a skid steer that did that and ran OK with blow by for about a year or so then worsened to the point oil was dripping out at a such at rate I was losing a quart a day.

Does it smoke before it warms up?






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 10-24-2006, 22:30 Post: 136283
rgpbeme



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yes it does . It seems to smoke more when on a angle It dosen't smoke as much when running at higher RPM.

It has only had a drop or two of oil come out






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 10-25-2006, 08:25 Post: 136287
earthwrks

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I dunno about yours but mine dripped oil AND it was being sucked into the intake (air cleaner) and collected there. If it's whiteish grey smoke it's oil, blackish brown is fuel.






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 10-25-2006, 10:18 Post: 136288
Art White



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I'd be checking the air cleaner and more then likely replace it.. From past experience it is a problem with ring leakage past the rings. This could be from wear or cylinder glazing. The wear part needs new rings in a rebuild. The glazing is from unburnt or partially burnt fuel from running an engine to cold. This can be cured by warming the engine better and working it hard to reseat the rings if the condition is not to severe oter wise you are back to the reringing process.






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 10-25-2006, 21:33 Post: 136314
bewing



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Where do you find this tube you are talking about? I have an older Bobcat 743 that puffs a little white smoke for 2-3 seconds when it first starts. It doesn't seem to burn any oil and after it starts it runs clean unless it is under a load and it smokes a little. WHat tube are you talking about and does my B7500 Kubota have a blow by tube too?






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 10-25-2006, 21:49 Post: 136315
rgpbeme



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Hi I don't think it is a blow by tube. It is the vent tube that comes off of the valve cover. Blow by is all the smoke that is coming out of the vent tube.






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 10-25-2006, 21:53 Post: 136316
bewing



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Thanks for your comments. It sounds like if I do not have any smoke coming out of the tube on the valve covers or alot of pressure I should be ok?

Is this tube on the valve covers there to bleed off unwanted pressure in the valve cover area?






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 10-26-2006, 05:52 Post: 136317
hardwood

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 Blow by

Bewing; The tube coming from the valve cover is to relieve crankcase pressure. It should be checked periodicly to be sure it is open, engines have been ruined because of a cloged blowby tube. When it is completly plugged the pressure from blowby has to go somewhere so usually it pushes oil past the main bearing seals, valve cover gaskets, etc. A little blowby is normal even a new engine has a little. Best of luck. Frank.






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 10-26-2006, 07:33 Post: 136318
earthwrks

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bewing on the Bobcat it's normal to have a few puffs of grey smoke---that's unburned fuel. It should go away after it warms up. If you restart it while warm it isn't there right? Vent tubes from my experience don't have to go all the way up to the valve cover; sometoimes they will come out the side of the block. Their purpose is to vent the crancase either to the atmosphere directly or recirculate it to the air cleaner (diesels) or to the intake through a PCV valve (gas)






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