Noticed my gear levers feeling spongy this morning. hynautic reservoir was down to 20psi. Pressured back up to 85psi and everything works fine- but noticed a slight hiss on the “dill valve “ which looks similar to the fill valve. Has anyone encountered this? It’s so slight I could stop it with a piece of play-doh.
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Hynautic control Reservoir slow leak
MV "Mystery"
Cheoy Lee 58' Motor Yacht
Trinidad & Tobago
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04-02-2021 03:37 PM #2
Re: Hynautic control Reservoir slow leak
85lbs seems to be rather high...isn’t the recommended pressure around 20-30lbs? In any regards, there might be dirt in the valve that needs to be cleared out. Try using a can of compressed air. Or you might need to replace the valve. The dill valve should screw out and can be replaced. Any good automotive store should have the removal tool and replacement valves. In addition, put dust cap on it to keep contaminants out (standard automotive tire cap works).
Last edited by Hat52MY; 04-02-2021 at 03:40 PM.
Best regards,
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David
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04-02-2021 04:45 PM #3Senior Member
- Join Date
- Jul 2007
- Posts
- 1,001
Re: Hynautic control Reservoir slow leak
What is a dill valve? I know there is a Schrader valve on the reservoir, but I’ve never heard of a Dill Valve.
Michael & Beth
Hull Number CV312
63’ Cockpit Motor Yacht
1986 model launched in August 1987
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Re: Hynautic control Reservoir slow leak
Thanks for the reply. I’ll definitely be covering to filling valve. The dill valve doesn’t have external threads as I suppose it’s supposed to be open to vent if required. The literature says to leave at 80-85psi with 1/2 to 2/3 full reservoir. At 20 psi the response on levers is sluggish.
MV "Mystery"
Cheoy Lee 58' Motor Yacht
Trinidad & Tobago
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Re: Hynautic control Reservoir slow leak
I haven’t heard of a dill valve before either, but that’s the name on diagram. I imagine it’s a relief valve.
MV "Mystery"
Cheoy Lee 58' Motor Yacht
Trinidad & Tobago
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Re: Hynautic control Reservoir slow leak
Hynautic control pressure is up there around 80PSI. Not like the steering systems.
The air pressure fill neck does leak at times (like a tire stem). I have found the pressure gauge to leak more often.
Bet you a beer, it's the air gauge.
Here,, hold my beer while I replace the air gauge...
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04-03-2021 09:52 AM #8Senior Member
- Join Date
- Jun 2012
- Posts
- 518
Re: Hynautic control Reservoir slow leak
If the sight gauge is the older square solid tube , it is probably leaking. If it’s the more modern flexible round tube probably it’s something else like the gauge Capt Ralph mentioned.
JMooney
61 MY 1983 #341
“Jerrie”
Miami , FL
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Re: Hynautic control Reservoir slow leak
Thanks for all the replies. I used the boat over the long Easter weekend here without issues. Since the leak was so minimal, I wrapped that valve with a bit of plastic wrap and the pressure held for 3 days. I’ll check back this week and see the loss over a longer time. I will order and replace that valve next.
MV "Mystery"
Cheoy Lee 58' Motor Yacht
Trinidad & Tobago
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Re: Hynautic control Reservoir slow leak
Like others have mentioned, most gauges are right when the needles are around 12 o'clock. Of course there are exceptions, but I keep all my Hynautic stuff at the 12 and a quick glance is all I need. If the leak is at a threaded fitting, just use some thread sealant and repressurise.