Want to get rid of the ads? Become a member by registering today.
The Mariah Owners Club

Forum Left Top

Welcome to the The Mariah Owners Club.


1999 7.4 Merc Exhaust Flapper Replacement

Mercury MerCruiser

Reply
 
Thread Tools
Old 06-28-2014, 06:18 PM   #1

99 Mariah 258 is currently offline
Posts: 131
Status: Admiral
Join Date: Jun 2014
Location: Miami Beach
My Year: 1999
My Model: Z258
My Engine: 7.4 & Bravo 3
Gallery Images: 14


Thanks: 17
Thanked 9 Times in 9 Posts
Send 99 Mariah 258:
a Private Message
 
Default 1999 7.4 Merc Exhaust Flapper Replacement

Had the boat on the hose after a day on the water and I heard a clicking sound from the exhaust and google informed me about these exhaust flappers......Has anyone done this on a 7.4(mine is a 1999).........Any tips or tricks.....Thanks in advance...
Reply With Quote
  • Old 08-08-2014, 08:48 PM   #2

    Hijo202 is currently offline
    Posts: 5
    Status: Stowaway
    Join Date: Jun 2012
    Location: Georgia
    My Year: 1997
    My Model: Z241
    My Engine: 7.4 L Bravo I
    Gallery Images: 0


    Thanks: 1
    Thanked 0 Times in 0 Posts
    Send Hijo202:
    a Private Message
     
    Default Re: 1999 7.4 Merc Exhaust Flapper Replacement

    I had the exact thing happen to me yesterday...I need the exact info...been googling it but not getting far
    Reply With Quote
    Old 08-08-2014, 09:55 PM   #3

    99 Mariah 258 is currently offline
    Posts: 131
    Status: Admiral
    Join Date: Jun 2014
    Location: Miami Beach
    My Year: 1999
    My Model: Z258
    My Engine: 7.4 & Bravo 3
    Gallery Images: 14


    Thanks: 17
    Thanked 9 Times in 9 Posts
    Send 99 Mariah 258:
    a Private Message
     
    Default Re: 1999 7.4 Merc Exhaust Flapper Replacement

    Quote:
    Originally Posted by Hijo202 View Post
    I had the exact thing happen to me yesterday...I need the exact info...been googling it but not getting far
    Hello.....

    Yea I googled and youtubed but only found videos of smaller motors but it's the same thing....it's easy...The flappers are installed inside the exhaust pipes.....they're located where the elbow after the riser connects to the y-Pipe on both sides. (On each side) loosen the 4 clamps holding the huge rubber connector ---- spray some wd40 on the y-pipe and try to slide the rubber connector down. Go ahead and take off the exhaust elbow as well.....You'll see the flapper sitting inside the y-pipe....If you see the new flapper you'll see they sit in place with two rubber plugs that hold both sides in place at the top of the y-pipe... Remove 1 side plug and try to pull the flapper out making sure not to drop anything down the pipe......it's simple but I have a lot of room in my engine compartment. Paid $65 each new flapper.......
    Willoughtree and Hijo202 like this.
    Reply With Quote
    Thank you 99 Mariah 258 for this useful post!
    Willoughtree (07-25-2019)
    Old 08-09-2014, 12:16 AM   #4

    Hijo202 is currently offline
    Posts: 5
    Status: Stowaway
    Join Date: Jun 2012
    Location: Georgia
    My Year: 1997
    My Model: Z241
    My Engine: 7.4 L Bravo I
    Gallery Images: 0


    Thanks: 1
    Thanked 0 Times in 0 Posts
    Send Hijo202:
    a Private Message
     
    Default Re: 1999 7.4 Merc Exhaust Flapper Replacement

    Thanks for the reply!!!!
    Reply With Quote
    Reply

    Bookmarks

    Tags
    7.4




    Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
     
    Thread Tools


    Similar Threads
    Thread Thread Starter Forum Replies Last Post
    z198 5.7L merc wredskinsfan32 Mercury MerCruiser 4 08-13-2013 03:43 PM
    Merc I/O - what goes down won't come up ATX_Diablo Mercury MerCruiser 8 07-11-2012 06:15 PM
    1999 merc 3.0l blown head gasket silver04roush Mercury MerCruiser 5 08-22-2010 05:12 PM
    Oil for my Merc 350 Jbetschart Original Mariah Talk 1 03-14-2010 09:43 PM



    Forum Right Top
    Forum Left Bottom Forum Right Bottom
     
    Right Left
    Member Login
    Forgot password?
    Forum LeftForum Right

    About the Club
    Age of the Mariah Owners Club:

    Total Members: 18,510
    Total Threads: 12,950
    Total Posts: 68,294
    Find us on Facebook Follow us on Twitter Subscribe to Mariah Owners Club on YouTube
    There are 140 users
    currently browsing forums.
    Forum LeftForum Right

    Find us on Facebook
    Forum LeftForum Right

    Club Sponsors
    Right Sponsor





    Forum LeftForum Right
    Right Right
    Right Bottom Left Right Bottom Right