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  1. #1
    Join Date
    Mar 2019
    Location
    Sevenoaks
    Posts
    136

    Rocker cover Breather weeping

    Just coming up to the first 600 miles and starting to check all bolts, nuts, weeping etc etc......

    It appears my Mr Gasket rocker cover oil vents are weeping oil onto the rocker cover and then dripping either down the engine or onto the rear spark leads.

    I assume this is common place, however is there any advice to stop this.

    I am running a 383 sbc with edelbrock rocker covers and Mr Gasket vents?

    Any thoughts or comments gratefully received.

    Jules.
    AK Cobra started 06/19
    On the road 11/2020
    Chevy 383 Stroker, TKO 600
    See my build on instagram: Julesdm14

  2. #2
    Join Date
    Aug 2009
    Location
    Birmingham
    Posts
    647
    Quote Originally Posted by Julesdm View Post
    Just coming up to the first 600 miles and starting to check all bolts, nuts, weeping etc etc......

    It appears my Mr Gasket rocker cover oil vents are weeping oil onto the rocker cover and then dripping either down the engine or onto the rear spark leads.

    I assume this is common place, however is there any advice to stop this.

    I am running a 383 sbc with edelbrock rocker covers and Mr Gasket vents?

    Any thoughts or comments gratefully received.

    Jules.
    Very common if not running a PCV breather system. You can always fit an oil catch tank.
    It just does....

  3. #3
    Join Date
    May 2004
    Location
    Cowbridge, United Kingdom
    Age
    63
    Posts
    10,352
    Are your rocker covers baffled?
    As Daryn suggests are running a PCV (positive crankcase ventilation) system?
    Doesn't sound like it if you have two breathers.
    Kev Davies
    South Wales Area Rep. UKCC Membership Secretary
    DAX Mk4, 383 Chevy Stroker, Tremec. SOLD
    Contemporary CCX 3-4028, 445ci Big Block FORD FE,TKO 600, Old School IVA'd and SOLD
    Dax De Dion LS2 and T56 IVA'd June '17 SOLD
    1965 Ford Mustang 289 Convertible SOLD
    In build- Hawk 289 Sebring Awaiting IVA

  4. #4
    Join Date
    Mar 2019
    Location
    Sevenoaks
    Posts
    136
    Kev

    I have two breathers one each side as provided by the engine builder. The breather has a very open pore wire or sponge baffle.
    If i get the PCV billet edelbrock breather, do i inter connect the two with a hose? Didnt expect this situation....logic dictates, allow pressure to move through breather, however oil splatter or vapour to be condensed, caught and allowed to drip back into rocker housing.

    http://photos.app.goo.gl/zpeX8KFNUU5zqCaG7
    http://photos.app.goo.gl/TkxCVSv8oA5DXWJd7

    Quote Originally Posted by kdavies3 View Post
    Are your rocker covers baffled?
    As Daryn suggests are running a PCV (positive crankcase ventilation) system?
    Doesn't sound like it if you have two breathers.
    AK Cobra started 06/19
    On the road 11/2020
    Chevy 383 Stroker, TKO 600
    See my build on instagram: Julesdm14

  5. #5
    Join Date
    Mar 2019
    Location
    Sevenoaks
    Posts
    136
    All answered and understood thank you......gotta ask why the engine builder gave me two atmosphere breathers and not one set up for vacuum assist to carb????? Any way, PCV temp plastic part bought as billet are all sold out!!!

    Thanks again.
    AK Cobra started 06/19
    On the road 11/2020
    Chevy 383 Stroker, TKO 600
    See my build on instagram: Julesdm14

  6. #6
    Join Date
    Jan 2006
    Location
    Chelmsford Essex
    Posts
    1,670
    My engine is Ford Cleveland but I am sure the same applies to your engine. PCV is more for emission control.

    My engine is open breather on both sides with no PCV return valve. My rocker covers are flat on my engine so what oil does come out goes on the top face and nothing onto the exhaust. Open breathing to catchment tanks is your option as suggested with slanted rover covers.
    I did look at running one back into the carb but my engine likes open breathing apparently having spoken to various engine builders and forums.
    John Desz

    Essex & Herts Area Rep. UKCC

    Dax 351 Cleveland T5 2.88 PL

    Events posted and meeting updates follow Face Book.

    https://www.facebook.com/groups/170236225077355

  7. #7
    Join Date
    Jul 2007
    Location
    peterborough
    Posts
    274
    Hi,

    Run 1 x PCV valve in one rocker cover to a port on the carb. ( port is normally at the front of the carb.)

    Jon
    AK

  8. #8
    Join Date
    Mar 2019
    Location
    Sevenoaks
    Posts
    136
    cheers jon
    Quote Originally Posted by aksportscars View Post
    Hi,

    Run 1 x PCV valve in one rocker cover to a port on the carb. ( port is normally at the front of the carb.)

    Jon
    AK
    AK Cobra started 06/19
    On the road 11/2020
    Chevy 383 Stroker, TKO 600
    See my build on instagram: Julesdm14

  9. #9
    Join Date
    Oct 2006
    Location
    Toton, Nottinghamshire
    Age
    48
    Posts
    900
    Jules,

    You may find some hints on this thread... http://www.cobraclub.com/forum/showthread.php?t=60801

    Russ.
    Joint Area Rep - East Midlands Region
    1984 DAX Cobra
    Rover 3.5 V8 with Holley carburetor.

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