[C320-list] Hose Priming on Replacement?

[Scott Thompson]

The Yanmar raw water pump should prime itself after replacing the hose 
since the pump is pretty much at the water line. Just don't run it too 
long with no water coming out of the muffler. Some people think you 
should lube the impeller with a water soluble lube before start up to 
help the pump prime and reduce friction until there is water running 
through it.

The two lines running to the water heater are filled with engine 
coolant, not water.  Replacing them requires first draining the coolant 
from the engine and then refilling afterwards. No priming is necessary, 
but you will want to check the coolant level after a few minutes of 
running in order to make sure that any air bubbles have worked their way 
out.

Scott Thompson
Surprise, #653

On 4/27/2015 2:05 AM, Joel Krauska wrote:
> While waiting two weeks for a mechanic to replace some of my hoses, I'm
> beginning to think I want to tackle the job myself.  The exhaust and
> venting hoses seem straightforward enough. (if a bit awkward to get to and
> nasty to cut.)
>
> What I'm mostly hesitating on his replacing the cooling water intake hose.
>
> I imagine popping the old one off (after closing the thruhull -- heh) will
> be a bit messy.
>
> I can deal with the spillage, but I'm concerned about what to do after
> installing a new replacement.
>
> Will the yanmar create suction to pull in all the water it needs and burp
> out the air, or do these lines need to be somehow primed?
>
> The other 'wet' hose I have questions about would be the pair that leads to
> the water heater.  Does that line need to be filled with water before
> replacing?
>
> I image I'm over thinking this, but wanted to ask the 'professionals' here
> for hose swapping advice.
>
> (My main line of thinking being that I don't think anyone did anything
> 'smart' during the last haulout, and I imagine the hoses could have drained
> out.)
>
> Cheers,
>
> Joel
> Grace #802