exhaust system internal workings

[seadoo_mike]

I know they say that the exhaust system is self draining, I am just trying to understand what that means. My exhaust muffler shown in the picture is lower than the exhaust hose outlet, I know that some water does come out the exhaust pipe into the water, since the outlet is higher than muffler wouldn't there be water trapped in muffler, how does that self drain, or am I thinking about it wrong. Im also trying to figure out what #1, #2 and #3 hoses marked in picture internally do. Is there a water jacket inside from the exhaust manifold and if so, how does it drain, not sure if I am making sense of this, dont what to confuse anyone on answering this question

 

[kustomkarl]

It's that old saying..." Gravity Sucks" all the water goes to the lowest point and drains out the exhaust system. In the manual for the 2009 4-tec it is suggested you use air to blow out the left over water in the small pockets to fervent freezing in the winter.

Karl

 

[hkr4444]

2009 open loop fllow

Hose 2 takes water from the Exhaust Manifold and both hose 1 and 3 inject water into the exhaust pipe that drain into the muffler. I think with the engine running the exhaust gas pressure forces the water in the muffler out of the boat, but I think (just my opinion) that without the engine running the muffler is the low point and water will collect there, I think that is one reasion using compressed air after flushing the engine would help push that water out of the mufler.

 

[kustomkarl]

:agree: that's exactly it...

Karl

 

[seadoo_mike]

thanks for the info. guy's

 

[Roundtracker]

I was told for my model to "rev the motor" blowing the water out, add stabilzer and WD-40 the motor... now enjoy our NC winter. Is this right?

 

[seadoo_mike]

don't know how cold it gets there in the winter, or if you keep it outside, but if it does get down into the low 30's for awhile you might to add some antifreeze to the exhaust system just to make sure, stabilze the gas and run it for it bit to get it in the fuel system, I filled my tank up on my last run and added the stabilizer and ran it on the lake, you can WD the motor, but I would also fog the engine with XPS if it is going to sit awhile

 

[Roundtracker]

Garage kept. Fogging, is that removing the air filter, spraying the fluid in while running?

 

[seadoosnipe]

Yes....

Garage kept. Fogging, is that removing the air filter, spraying the fluid in while running?

Yes, when you pull that little (787) stopper from the air box, stick the red tube into that little hole and give it a sqirt; you should hear the engine speed up momentarily, then back to a high seed idle, if our doing this on trailer.

 

[seadoo_mike]

snipe,

As far as the fogging procedure, would it be correct in saying that there could be one of two ways to do this, the first while running engine spraying in fogging oil to stall engine, and the other to pull the fuel rail with the injectors, spray into the ports, crack engine in drown mode and reinstall fuel rail, also pull spark plugs and spray into holes and also crank over in drown mode and reinstall plugs, would each way be equally effecient in fogging the motor, when I had a carburated boat before I would spray it down the carb's until the engine stalled, I have heard that you may not want to fog a fuel injected motor while it is running, or is that just plan crap, would it also be correct in saying that fogging in the drown mode would coat the internal's just the same as fogging while running engine.

 

[kustomkarl]

Don't pull the fuel rail. Just spray it in the intake while it's running or drown mode, down the spark plug holes. The main thing to remember is to coat the internals.

Karl

 

[seadoo_mike]

why not pull the fuel rail, the intake and injectors are both in of the same air path?

 

[kustomkarl]

You can, you just don't have too, to fog the engine.

 

[seadoo_mike]

I guess it may be easier to pull off the intake hose at the throttle body rather then fuss with the fuel rail, would that be right?

 

[99SK04GTX]

SeaDoo always recs removing the fuel rail

popping the injectors and spraying in XPS spray (used to be Bombardier spray). XPS is lighter than fogging oil. Fogging oil to coat the internal mechanicals, not fuel injectors.