MGB & GT Forum
Lots of oil from port side breather tube
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Apr 30, 2024 02:14 AM
Top Contributor
 Joined 15 years ago
19,098 Posts
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Excess oil from that tube means only one thing for sure.
The steel mesh that aids in condensing oil vapors located behind it is coked up. Take the cover off, clean or replace the steel mesh and reinstall sealing the cover well.
In all actuality you get less oil from that tube with the gauze completely missing than from a coked up oil condenser.
Michael J. Caputo
'79, '77, '76, '74.5 (rubber dual SU), and '73 owner. Extensive experience in 12v Audio System design and installation. Vendor of Regalia and Promotional Products since 1993. Supplier of Accessories to MOSS. Forum Member since 2009; with a warped sense of humor since birth. Publisher of the annual MGB & GT Calendar, mailed worldwide.
The steel mesh that aids in condensing oil vapors located behind it is coked up. Take the cover off, clean or replace the steel mesh and reinstall sealing the cover well.
In all actuality you get less oil from that tube with the gauze completely missing than from a coked up oil condenser.
Michael J. Caputo
'79, '77, '76, '74.5 (rubber dual SU), and '73 owner. Extensive experience in 12v Audio System design and installation. Vendor of Regalia and Promotional Products since 1993. Supplier of Accessories to MOSS. Forum Member since 2009; with a warped sense of humor since birth. Publisher of the annual MGB & GT Calendar, mailed worldwide.
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 Shakopee, MN, USA
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Apr 30, 2024 07:24 AM
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 Cambridge, ON, Canada
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Apr 30, 2024 07:36 AM
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Apr 30, 2024 12:11 PM
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Joined 2 years ago
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Chuck
I had the same issue and removed the tappet chest cover to find the inside completely gunked up as per the first couple of photos.
The mesh is behind the inner plate and hard (impossible?) to remove without cutting and rewelding but I found that by swilling it out with white spirit and with a bit of pressurised washing with a degreaser etc, it cleaned out fine.
The last photo shows it after cleaning and with my own "homemade" wider cork gasket. Many years on...no oil blowing up out of the pipe and no leaks from the gasket.
Tony
I had the same issue and removed the tappet chest cover to find the inside completely gunked up as per the first couple of photos.
The mesh is behind the inner plate and hard (impossible?) to remove without cutting and rewelding but I found that by swilling it out with white spirit and with a bit of pressurised washing with a degreaser etc, it cleaned out fine.
The last photo shows it after cleaning and with my own "homemade" wider cork gasket. Many years on...no oil blowing up out of the pipe and no leaks from the gasket.
Tony
Attachments:
DSCF3463.JPG 41.9 KB
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Apr 30, 2024 08:54 PM
Top Contributor
 Joined 8 years ago
295 Posts
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I'm working on exactly the same issue - burning oil and lots of oil in the PCV mushroom. My cover/separator is quite different , though, with no way to see what's inside it.
I soaked it in gasoline for several hours this afternoon, and now the gasoline runs out clear, so to me that means it is clean.
Richard
Richard Gray
I soaked it in gasoline for several hours this afternoon, and now the gasoline runs out clear, so to me that means it is clean.
Richard
Richard Gray
Attachments:
mgb oil separator.jpg 39.2 KB
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