Mark, You'll see the lever in that small cabinet on the starboard side. (Same as mine). When it's closed, (Turned at right angle), it closed off the water flow from the seacock): no wate will flow into the lines to the Head).
When opened, (turned straight), it allows was to flow from the seacock and into the lines for the head. When you pump water at the head, it will suck water via the seacock and lines.
(Have an eye, if the gaskets are worn or gummed up in the head), you might not have enough suction to pull water through line lines. (Sucking air instead).
I know this 1st hand: Last year I installed all new gaskets in my JABCO head. They were all worn out - the top gasket had deterioated causing no seal/no vaccumm) to pull water from the seacock & throught the lines. Worked great after the gaskets were replaced... But
At the beginning of this summer, getting everything going I found that the head wouldn't suck!. I took the top gasket portion of the head apart to find that they were fine but "grimy and slime). I washed them off and reseeted them in the head.. This re-instilled the vacuum like seal to suck the water from the cock through the lines - to the head. It worked great for the rest of the summer.
Might as well make this page flip over to Page 91! with a few summer snaps. The Marathon preformed well with no issues, other than I have to replace my transducer and re-do the swim platform wood and pulpit but there's nothing quite like a having a Marathon and being on the water!.











Edited by Norm_Richards on 29 September 2010 at 4:07pm
Norm Richards
Marathon Boat Owners Group - Member #7
1989 Marathon Bermuda Sport 2550 "Vintage Haven"
