Logo
Results 1 to 3 of 3
  1. #1
    Join Date
    May 2021
    Location
    Capital Beltway, MD
    Posts
    2

    Default Whats The Vent on my Johnson Intermediate Unit?

    Folks,

    Vertically above the lower unit and below the powerhead of my 25 HP 2 stroke Johnson is a vent with 2 ports. Occasionally warm water comes out of it.

    Not being a fisherman or boater I'm not able to identify it or know if its supposed to leak water periodically. It's held on by 3 screws and has a rubber gasket under it. Moreover, underneath it looks like a maze of aluminum channels like a filter of sorts.

    Help tell me the purpose because no illustration or Youtube can tell me what it is.

    Thanks,

    LakeCountyClick image for larger version. 

Name:	Vent on Johnson.jpg 
Views:	23 
Size:	194.6 KB 
ID:	26817

  2. #2
    Join Date
    Sep 2010
    Posts
    21,963

    Default Re: Whats The Vent on my Johnson Intermediate Unit?

    ??-----It is called the exhaust relief.-----Outboards have had this feature in one form or another for about 70 years.----The idea is to allow exhaust out so that the motor does not have to push it 2' down under water.----Makes for better low speed operation.----Yes and some water will spit out too.

  3. #3
    Join Date
    May 2021
    Location
    Capital Beltway, MD
    Posts
    2

    Default Re: Whats The Vent on my Johnson Intermediate Unit?

    racerone

    I thought I'd answered the other day but it didnt take. Anyhow, Thanks for the answer, I'd hoped that it was going to be this way and it was!

    I appreciate it.

    LakeCounty

Similar Threads

  1. Shimming Lower Unit to Intermediate - DP
    By mike77cj in forum Volvo Penta Gas Engine Forum
    Replies: 5
    Last Post: 08-14-2017, 09:48 AM
  2. AQ290 Separating the lower unit from the Intermediate unit - HELP
    By Indy1K in forum Volvo Penta Gas Engine Forum
    Replies: 5
    Last Post: 03-09-2016, 08:49 AM
  3. AQ260/290 Shimming lower unit to intermediate Units
    By Indy1K in forum Volvo Penta Gas Engine Forum
    Replies: 3
    Last Post: 09-29-2015, 12:59 PM
  4. A Weird Intermediate Unit
    By corsair23 in forum OMC Sterndrive and Inboard Archive
    Replies: 0
    Last Post: 03-25-2008, 10:52 AM
  5. Whats a vent jet do
    By David Tangwall in forum Outboard motors archive 2000-2004
    Replies: 3
    Last Post: 07-29-2001, 11:12 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •