Oil blowby
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From: Lincoln Park
Oil blowby
I have a situation that I am stumped with. I recently had my 96" changed to a 107. New oil pump cam plate, cams and head work. After I went about 1200 miles on a weekend trip I came home and changed the oil. After the change I noticed oil coming out of the air cleaner big time.. Enough that it would get all over the pipes and bags and smoke . I put an external breather on and myst free breathers checked oil pump alignment and on ring , nothing out of spec. Crankshaft was done also. No excess runout . Anybody know what I can check next ? Could cylinders be out of wack? No smoking from the exhaust.. Last 300 mile ride I went on it puked out almost a quart. No oil in the sump either but couple ounces. Not sure what to do next . Help....
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you can have good compression control and bad oil control and vise-versa. i would guess this is a classic sign of poor piston ring seal. there are several factors from improper clearance to improper cylinder honing. it could/could not go away with more miles. a leak down test will shed some light on what's going on.
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From: san antonio
So, just to be clear, no puking for the first 1200 miles after the build? Puking started after the first oil change? Your forum name would indicate that the bike is an Streetglide so it's not a softail? Agree with bustert on a leak down but seriously doubt poor ring seal is the source of the blowby if no puking the first 1200 miles. How have you vented externally? You say oil pump alignment and o-ring all good but have you actually checked for sumping?
Last edited by djl; Feb 6, 2019 at 10:22 AM.
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From: poway
Could be any number of issues.. Poor ring seal is one of them. Improper assembly of head breathers is another. Drilling out the oil drain holes in the rocker towers helps with some of the oil coming out the breathers. Any air leak that allows air back into the motor can cause breather bleed. Miss installed rocker base gasket. Leaky dipstick. You say you checked the pump spigot O ring. I'd double check it if going back inside.
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From: Lincoln Park
So, just to be clear, no puking for the first 1200 miles after the build? Puking started after the first oil change? Your forum name would indicate that the bike is an Streetglide so it's not a softail? Agree with bustert on a leak down but seriously doubt poor ring seal is the source of the blowby if no puking the first 1200 miles. How have you vented externally? You say oil pump alignment and o-ring all good but have you actually checked for sumping?
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From: Lincoln Park
Could be any number of issues.. Poor ring seal is one of them. Improper assembly of head breathers is another. Drilling out the oil drain holes in the rocker towers helps with some of the oil coming out the breathers. Any air leak that allows air back into the motor can cause breather bleed. Miss installed rocker base gasket. Leaky dipstick. You say you checked the pump spigot O ring. I'd double check it if going back inside.
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From: Lincoln Park
Not overfilled, yes about halfway up the dipstick. Hasn't stopped
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From: Lincoln Park
So, just to be clear, no puking for the first 1200 miles after the build? Puking started after the first oil change? Your forum name would indicate that the bike is an Streetglide so it's not a softail? Agree with bustert on a leak down but seriously doubt poor ring seal is the source of the blowby if no puking the first 1200 miles. How have you vented externally? You say oil pump alignment and o-ring all good but have you actually checked for sumping?
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if the bag is above the sump, level has zero to do with the issue. if the bag is below the sump, then things can happen which is associated with vapor lock with i do not think has happened because it will do it under certain conditions.
the reason i said cyl seal is that a wrong final cut on the bore will eat away the rings and could take that many miles to do so, seen it before.
i picked up a sweet deal on a 74fxe one time because the dude did a top end and it smoked and used more oil than before, issue, rings upside down. not your issue here, just saying, doodoo happens.
the reason i said cyl seal is that a wrong final cut on the bore will eat away the rings and could take that many miles to do so, seen it before.
i picked up a sweet deal on a 74fxe one time because the dude did a top end and it smoked and used more oil than before, issue, rings upside down. not your issue here, just saying, doodoo happens.