Exhaust Flap

[kentsmith12]

I've got a 2000 ProAir and noticed that the exhaust flap was ripped of this weekend (I have no idea how it happened)... Do I need to get another one? I see boats without the flap.

Thanks!

[Rick]

RE: Exhaust Flap

It is best to keep water from being forced into the engine when it is off They are only 10 bucks at West Marine.

[richard]

exhaust flap warning

If engine keep on running,its no danger on water,otherwise wave will choke to the cylinder!,put back a new one before go out to water will avoid a nightmare for you.

[Andrew]

RE: exhaust flap warning

it is not necessary.... the only way you will get enough water into the manifold to do engine damage is to turn the boat on end and fill the exhaust tube to the top....

[saceone]

RE: exhaust flap warning

id get one...imagine having somekind of fish nest IN your exhaust...hehe

[kentsmith12]

Thanks. Great point on the bird nest...

[TravisFling]

Imagine the fish nest, in there all comfy, and then there comes the mighty sound of 3 or 4 hundred horsepower!!! Poor fish. I love the sound of Nautique's... there's an old Mustang on my lake and it's the best sounding boat on the lake for sure... it's awesome. Mine didn't have one on it when I got it, but I put one on there just for giggles. Can't hurt, for sure, and they're cheap and easy. (Just like my ex-girlfriend... hahaha... haha... ha.. uh.. nevermind.)

[aikenis]

Why would you even ask? Cheap and easy to replace. Just do it!

[richard]

Lost flap warning!

Since my friend experienced choked the engine while lost the flap anchoring in a wave area and off the engine ,a big smoke (stream)out of the exhaust and than never can start again (water in cyclinder) and blended the valve rod after start servel time until battery get weak,(never attempt start when same situation happen,tow back and remove all the spark plug and crank the engine a lot of water could jet out.) finally the bill for repair 3.5K

[Andrew]

RE: Lost flap warning!

so, what magical spell does ur water pump cast on the cooling water, that prevents it from "choking the engine?"

[Rick]

RE: Lost flap warning!

The water can travel up the exhaust into the muffler. Then slosh up into the manifold and subsequently into the cylinders. Yea it's a longshot and the conditions have to be just right. But if it does as Richard says water doesn't compress and as a result you bend rods and valves and it gets really expensive in a hurry.

[Bruce_M]

RE: Lost flap warning!

I just replaced the flapper on my 97 nautique, 24bucks from DIM. Took 5 minutes to replace, when I was finished I told my wife that I love those kind of repairs. Nice and easy !!

[Andrew]

Re: RE: Lost flap warning!

The water can travel up the exhaust into the muffler. Then slosh up into the manifold and subsequently into the cylinders. Yea it's a longshot and the conditions have to be just right. But if it does as Richard says water doesn't compress and as a result you bend rods and valves and it gets really expensive in a hurry.

ur manifolds already contain a good bit of water with or without the "flappers".......

filling ur cylinders with water will do damage.... no doubt about that!
but, to "slosh" water up a 3"-4" pipe at a height of 2'-3' and THEN get a substantial amount through the manifold, past a valve, and still have enough water to do any damage is not going to happen......

[saceone]

RE: Re: RE: Lost flap warning!

hydrolock is not fun. RUN A FLAPPER SAVE A ROD'R

[djbartholomew]

RE: Re: RE: Lost flap warning!

they come from the factory with them on for a reason.