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...

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

Re: 1999 7.4 Merc Exhaust Flapper Replacement
 

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.......

Re: 1999 7.4 Merc Exhaust Flapper Replacement
 

Thanks for the reply!!!!