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  1. #1
    Seaman
    Join Date
    Aug 2008
    Location
    Virginia
    Posts
    59

    Default flapper valve in exhaust?

    I have a 99 Volvo 5.0GL. I removed my exhaust bellows and found a set of flapper valves mounted on a shaft inside each of the exhaust pipes below the elbows. One was melted and the other one has melted off and fallen down. I have looked on the volvo parts breakdowns and I cannot find the flapper valves. Anyone have any thoughts on this?
    Portsmouth, VA
    1999 Wellcraft 200S, Volvo 5.0GL (changed to NEW GM 5.7) SX-M
    "A boat is a hole in the water into which you throw money." I have thrown my share and am really enjoying it!

  2. #2
    Honorary Moderator Emeritus Don S's Avatar
    Join Date
    Aug 2004
    Location
    Western WA.
    Posts
    62,323

    Default Re: flapper valve in exhaust?

    The flappers were eliminated, here is the service bulletin on their elimination.
    Attached Files Attached Files
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  3. #3

    Default Re: flapper valve in exhaust?

    volvo has discontinued them, but the omc flapper valves cross over and fit perfectly.I just replaced the manifolds and flappers on my 4.3 gls with sx drives.the flapper is:omc765166,pin omc913663,bushings omc3855517.

  4. #4
    Commander RogersJetboat454's Avatar
    Join Date
    Jul 2010
    Location
    Somewhere in the North East
    Posts
    2,954

    Default Re: flapper valve in exhaust?

    Quote Originally Posted by carter72 View Post
    volvo has discontinued them, but the omc flapper valves cross over and fit perfectly.I just replaced the manifolds and flappers on my 4.3 gls with sx drives.the flapper is:omc765166,pin omc913663,bushings omc3855517.
    2 year old thread guy, the red banner at the bottom should have told you this...
    Please read this;
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    1976 Rogers Custom Boats 18' "Bonneville" W/ Chevy 454/ Berkeley 12JC

    Care Taker of 1976 Glastron V-184 Crestflight W/ Volvo 170B/280 I.O.
    & 1969 Starcraft W/ 1956 Evinrude 7.5hp Fleetwin.

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