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Farmall & IHC Tractors Discussion Forum
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Oil blow bye on rebuilt motor

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Bill from Senec

10-10-2004 06:18:22




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Hi, Why do you get some oil blow bye even on a rebuilt motor?? What exactly is oil blow bye?? Any help would be appreciated. Thanks, Bill




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Hermit

10-10-2004 19:07:21




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 Re: Oil blow bye on rebuilt motor in reply to Bill from Seneca,IL, 10-10-2004 06:18:22  
If you have a crankcase vent line that goes to the intake, make sure it's hooked up properly and not blocked. This vent line is suppose to draw the crankcase fumes into the engine.



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Allan in NE

10-10-2004 07:05:45




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 Re: Oil blow bye on rebuilt motor in reply to Bill from Seneca,IL, 10-10-2004 06:18:22  
Hi Bill,

Blow-by is nothing more than compression gases escaping around the rings. A certain amount is completely normal.

If it is excessive, I would suspect a ring (or rings) either being installed upside-down or not staggered right.

And again, like I have been harping to total excess here, if the engine was just rung and not rebuilt properly, there will always be too much blow-by....always; just can’t get around it.

In this case, there is just no way to ever seal up such an animal, save tearing it down and redoing it the right way.

Allan

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magman

10-10-2004 07:02:01




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 Re: Oil blow bye on rebuilt motor in reply to Bill from Seneca,IL, 10-10-2004 06:18:22  
Are you sure its blow bye?? While running tractor after it gets hot are you seing blue smoke coming from the exuast pipe? Is it just at start up?
Someone has exsplained it better on the board than I but I beleve its typicaly when the oil is alowed to by pass the compression rings going to the top of the cylender. Causing blueish smoke when you run it. Thus a brand new motor could have blow bye becuase of rings not seated yet to cylender wall. Older tractor with worn out rings would do it becuase there not seating becuase of wear to rings and cylender walls. JON

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Allan in NE

10-10-2004 07:09:24




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 Re: Oil blow bye on rebuilt motor in reply to magman, 10-10-2004 07:02:01  
Jon,

Blow-by comes out the draft tube or crankcase vent/dump and not out the exhaust.

Allan



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magman

10-10-2004 07:12:21




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 Re: Oil blow bye on rebuilt motor in reply to Allan in NE, 10-10-2004 07:09:24  
I see I knew that . But I was thinking about a 300 and a cub I just bought and they both sat for a long while I got smoke at the exuast for the first couple hours untill the rings seated again. I figured that was blow buy. JON



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Okie Dave

10-12-2004 06:46:20




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 Re: Oil blow bye on rebuilt motor in reply to magman, 10-10-2004 07:12:21  
When you fire up a tractor that has set for a while the oil smoke you get out the exhaust is oil getting by the valve guides, the seals get hard and leak. Unless it has rust coating the cyl walls then if to severe it will have to be rebuilt.



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Allan in NE

10-10-2004 07:25:25




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 Re: Oil blow bye on rebuilt motor in reply to magman, 10-10-2004 07:12:21  
Hi Jon,

I do the same thing; and it is getting worse the older I get.

Something about jump starting my old pee-brain, which is still asleep. LOL!

Talk at ya later,

Allan



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