[C320-list] 'Sticky' Through-Hull Valves

[Dave Hupe]

Forespar says "Marelon valves are non-corrosive, but like any moving part in a marine environment, they require regular use, inspection, and lubrication. Do not fail to actuate the handle regularly and lubricate the seals at least once a year or more. Use any-non petroleum based grease and avoid any aerosols as the carriers used may damage the valves. Never use a penetrating lubricant like WD-40! To lube, close the valve, remove the hose, remove any standing water (as much as possible), and use a soda straw or other flexible, throw-away device to swab the ball through the tailpipe or elbow. Replace the hose (check for worm or rusty hose clamps and replace if necessary), then activate the handle to draw the lubricant around the seals. When the boat is hauled, this can be done through the thru-hull easily. The best maintenance is regular use. Any valve, regardless of material will seize if left in a boat in the water unmoved for any length of time. Marine growth alone will build up and clog the valve rendering it inoperable".
I swab the closed valve balls with silicone grease containing teflon from beneath through the thru-hull fittings every time my boat is hauled and then exercise the valves. Even with this my valves also are tight. I have replaced and rebuilt several valves with kits available from Forespar. I was amazed what good shape the original valves were in once disassembled. 
You might try loosening VERY VERY SLIGHTLY the 4 philip head screws visible on the top plate just beneath the handle. While rebuilding mine, I noted how significant these screws impact the mechanism.  However, if you do this, monitor very closely if seepage develops around the body of the valve. 
Dave Hupe 
1994 C320 #32
Yahoo Mail: Search, Organize, Conquer 
 
  On Mon, Apr 29, 2024 at 11:34 AM, Tony Kalish via C320-list<c320-list at lists.catalina320.com> wrote:   I have the Marelon through-hull valves on my 1999 Catalina 320.  I try
every year to lube and exercise the valves but they still bind and are
'sticky'...they don't open/close smoothly.  I've been using the Marelube to
help keep them working, but doesn't seem to be working.  Any suggestions?
Anyone else have similar issues?