Rubber plugs on each side of air chamber on 1955 Johnson CD-12 Purpose?”

[DickS]

I have not seen these plugs on CD-12’s in pictures or videos.  What are they for?

[RICHARD A. WHITE]

If they are behind a plate the is below and behind the carb…they are controlling the pressure pulse for fuel delivery

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[DickS]

Richard,  you are describing the pulse plates behind the intake.  I am talking about the horns  of the air chamber that have openings on each side pointed toward the power head.

[Bob Wight]

I’ve never seen any kind of rubber plugs in the air silencer you’re referring to.   You have pictures of some?

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

[Don]

Are you speaking about the Rubber bumpers that mate to the engine cover??

Item 77 in the following diagram:

https://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1958&hp=5.5&model=CD-15&manufacturer=Johnson&section=CARBURETOR+GROUP

Yes, I realize this diagram is the wrong year, but just trying to pinpoint what you are asking about….

[JACQUES]

yes CD12 shows those pointy bumpers  my CD11 does not have them but has  back bumpers in the cowl,

 

if you are missing “front bumpers”  you may be able to  make some using  common tire valves with the brass threads snipped off.      they work great as   “back bumbers” to replace the original star shaped bumpers

so maybe doing some creative carving on tire valves will work out cheap

Joining AOMCI has priviledges 🙂

[stanley]

JACQUES wrote:

yes CD12 shows those pointy bumpers  my CD11 does not have them but has  back bumpers in the cowl,

 

if you are missing “front bumpers”  you may be able to  make some using  common tire valves with the brass threads snipped off.      they work great as   “back bumbers” to replace the original star shaped bumpers

so maybe doing some creative carving on tire valves will work out cheap

What a great tip!I’ve been trying to come up with a substitute for those bumpers.

[RICHARD A. WHITE]

Or you can contact member Ben Breitner, he makes all that stuff..very good stuff indeed.

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[JACQUES]

just an idea from from  SteveD or predecessor…:-)  engine side  back or cowl fit   they all work

 

Joining AOMCI has priviledges 🙂

[Don]

OK, perhaps the older CD uses those wingnuts up front.  Is the poster looking for the rear rubber bumpers that mount on then engine cover inside?

[Author]

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