Draining the Risers & Manifolds?

[Wolf pack]

How long should I go before I should drain the manifolds & risers?
I use the boat every couple of weeks, but sometimes I won't run the engine for a month.
I live on the central coast of California, so it doesn't really freeze here. My manifolds and riser are
fairly new. I store the boat on a trailer in a yard close to the launch ramp. I flush the engine with fresh
water after every trip too! Thanks!

 

[Bondo]

Re: Draining the Risers & Manifolds?

How long should I go before I should drain the manifolds & risers?
I use the boat every couple of weeks, but sometimes I won't run the engine for a month.
I live on the central coast of California, so it doesn't really freeze here. My manifolds and riser are
fairly new. I store the boat on a trailer in a yard close to the launch ramp. I flush the engine with fresh
water after every trip too! Thanks!

Ayuh,.... The block, 'n manifolds never need drainin', unless the temps drop to 32?, or lower,....

 

[Levinz11]

Re: Draining the Risers & Manifolds?

I live in FL. No hard freezes here. I never drain anything on my boat even if I know it won't get used for a month.

 

[Wolf pack]

Re: Draining the Risers & Manifolds?

Thanks Guy, Yeah I just have seawater that goes into a heat exchanger then to the manifolds + risers + out the exhaust collector & finally out the drive (280)
I do have anti freeze that cools the engine.

 

[jerryjerry05]

Re: Draining the Risers & Manifolds?

The draining of the system will actually speed up the rusting process.
It rusts in the water but out in the air it's quicker.
Your closed system has a drain plug on the heat exchanger.
If your really worried it can be drained and filled with cheapo RV antifreeze.
Never use automotive AF in a system that will flush into the water(illegal).
I guess your running in salt water, the flush is a good thing.