Need some Help. I am replacing 3 out of the four internal flappers for my boat. I have the replacement flappers but want to make sure I am doing it correctly. I believe we have to remove the tips of the stern and loosen the the clamps around the rubber in the engine compartment, to pull the tips out and then replace the broken flappers with the new ones. With that being said is that all that needs to be done or can you replace them without removing the tips? If we have to remove the tips to replace, when we re-install the tips into the stern what type of sealant/culk needs to be placed on the tips? Any help is appreciated.

it is easier to remove the tips, just loosen the two clamps at the tip, remove the screws on the tip, take fishing line and go around the outside of the tip to release any adhesive from transom, wiggle the tip in every direction while pulling back, also when reinstalling, smear dish soap on the inside of the exhaust hose, if the tips are above the waterline then a silicone caulk can be used, if below use 3m 4200

I gotta do the same thing. Ugh..... :-(

Blown... Thanks for the help. Wanted to make sure i was doing the right thing before I got to involved and doing the wrong work.

Kid.... I'm not to happy about it but got to be done and doesnt look to labor intesive.

I went the simple way and just put the rubber flappers on the end of the tips..... You cannot see my exhaust because fo the swim platform so I was not worried about looks.

I got internals AND RUBBER FLAPPERS. I think I'm just gonna gut the internals or run it how it is. LOL

How do you know if they need replaced?

How do you know if they need replaced?

When they're gone. :D

I am new to the whole thing, I dont have external ones so I assume I have internals. So is there a way to tell with out taking them apart, what happens if you didnt realize they were gone.:eekdrop:

When they're gone. :D


I am new to the whole thing, I dont have external ones so I assume I have internals. So is there a way to tell with out taking them apart, what happens if you didnt realize they were gone.:eekdrop:

Should be able to look up the tail pipe with a flash light and see them. I have a picture in thread called "how bad is this" in the technical section. All the rubber contact points are burnt off my internals so when I start it up it sounds like the rain cap flapper on a tractor exhaust stack, 'ting ting ting ting'. Half of one of the internals is laid open and is Hung up and won't let it close aswell. Worst case if there gone you might have got some reversion, or a big wave hits the back of your boat and hydrolocks your motor. Rare but could happen. If your getting reversion I'm told you can keep and eye on your oil changes for milky oil (water in oil) and by cutting your oil filters apart.

My tips are covered by the swim platform as well. I too have the rubber flappers as well on the tips. The chance for reversion is greater depending on the cam you have, from what I understand. To me it is cheaper to replace the internals then to have a greater chance for reversion. I agree with kid on checking them. All I did was left the rubber flap and look down the exhaust or into. I found one was seized open and two others had cracks which caused the tick noise kid is talking about. So if you have the choice in my opinion, I would replace them.

My tips are covered by the swim platform as well. I too have the rubber flappers as well on the tips. The chance for reversion is greater depending on the cam you have, from what I understand. To me it is cheaper to replace the internals then to have a greater chance for reversion. I agree with kid on checking them. All I did was left the rubber flap and look down the exhaust or into. I found one was seized open and two others had cracks which caused the tick noise kid is talking about. So if you have the choice in my opinion, I would replace them.

I'm far from an expert but the flaps are to prevent water intrusion, not reversion. Reversion happens internally from valve overlap and/or water introduced into the system too early. The flaps just keep water from entering the engine through the exhaust pipe.

If you have external flaps there is no reason to also have internal flaps IMO.

Onesickpantera..... You are right. The word is intrusion... My mistake.

Anyways I removed my Tips today and began working on them. One thing to remember for the ones that are thinking about replacing them, I found out today that I will need a welder to re-install the new flappers. The current ones need to be drill out then the new ones re-installed and welded and then the welds grinded down to smooth. Just for others interested in doing this.

If your tips are made by corsa they have a lifetime warranty on all parts, call jeff 440.260.3145. Eddie marine will have a small fee. 909.945.2830. Corsa,s tips have dual flappers & eddies have a single butterfly.

They hassle you about being the original owner or not?

They never asked, so I wasnt telling

Just like you did with the military! Lol . On a serious note. That's for the contact number. I'm gonna trade mine in now!

Sorry no military for me, I was too much of a prick to have another yell at me all the time. & why keep flipping me off with the sausage fest behind you? No ass up at Higgins?