exhaust manifolds, winterizing.

[77_starcraft]

After reading several methods of winterizing I drained the block and refilled with red RV anti freeze thru the thermostat housing. I also filled the fuel/oil cooler hoses and put a quart or so into each hoses leading to the exhaust manifolds.

didn't see any make it out the exhaust tips and wondered if the anti freeze filled and exhaust port or cylinder as the engine is not running...

Is this possible or does the water have to exit the exhaust tubing?
How much water do the exhaust manifold hold before they spill into the engine or out the tubing?

I started and ran the engine for a minute or two on the muffs just to make sure I don't end up with a rusty valve or cylinder.

1998 Baja 232 Islander
454MPI / Bravo 1

 

[Alpheus]

Re: exhaust manifolds, winterizing.

I started and ran the engine for a minute or two on the muffs just to make sure I don't end up with a rusty valve or cylinder.

Why would you go through all of the trouble of filling your engine with antifreeze just to flush/dilute again with water?

You have to be doing something very wrong or very deliberate to dump antifreeze into your cylinders.

The exhaust and the water does not mix in the manifold.

Drain it and leave it. Air don't freeze...

Use the K.I.S.S. method, it works every time...





.

 

[Bondo]

Re: exhaust manifolds, winterizing.

I started and ran the engine for a minute or two on the muffs just to make sure I don't end up with a rusty valve or cylinder.

Ayuh,... You just Unwinterized it, Right there....

Now, you can try again...

 

[77_starcraft]

Re: exhaust manifolds, winterizing.

Ayuh,... You just Unwinterized it, Right there....

Now, you can try again...

agreed, after further review I have decided to drain and leave empty. just needed to be 100% sure I am not doing $$$ damage beacuse I am still learning.

the engine and drive have to come out in a few weeks to r/r the engine coupler.

got a cut open view of the top half of the riser/manifold?

I doubt it even gets cold enough here in phx to freeze an engine block but not going to find out.

 

[HT32BSX115]

Re: exhaust manifolds, winterizing.

Howdy,


When you drain everything, you just have to ensure that you drain the low-lying hoses (by disconnecting) to get the pooled water. It's not usually a big problem unless your oil/PS coolers are also positioned horizontally, "low-lying" and still filled with water.

People put A/F in the raw water system in the hope that it will mix with this "low-lying" water that cannot be drained easily from the hoses, raw pump (if installed on the engine), oil and PS coolers etc...


The best bet is always to disconnect components that have hoses in low areas that don't drain.

It's also why you should also remove petcocks on the block and manifolds (and completely remove the newer "Single Point Drain" systems) so you can ensure that all the rust flakes and other debris is not plugging the drain and preventing the water from exiting!

Once you're absolutely SURE that all the water is out you can relax knowing that no ice can form if there's no water inside!!


Cheers,


Rick

 

[Alpheus]

Re: exhaust manifolds, winterizing.

Here is a cutout of a riser. You can see the exact point where the exhaust and the raw cooling water comes together. I also added the pic to my post above so you can see how they fit together. Don't feel bad, when I first started playing with boats this is one thing I had to see in order to wrap my brain around on how it worked. This should clear everything up for you...

 

[SuperNova]

Re: exhaust manifolds, winterizing.

One thing I think you may be confused about regarding the manifolds...there are also a set of drains on the manifolds designed to get all the water out of them, don't forget to remove these also. And poke a small screwdriver up though the fittings after you remove the petcock to make sure the drain isn't blocked by sand, mud or rust. So if you have a single V-8 you should have at least 4 petcocks in your hand when you are done winterizing.

 

[tkrfxr]

Re: exhaust manifolds, winterizing.

Ah-Ha! Those cut-outs are awesome!

Now I know what's in there....or what can be in there... or why there is water and black soot or muck when the drain plugs are removed...

Thanks, Alpheus!