leaking pressure relief valve

drmax · Post by **drmax** » July 16th, 2019, 10:11 am

Hello. I have a 1987 Carver 32. Behind the lower helm, is what I have identified as the pressure relief valve for steering. I see the 3 hoses coming out of the back of the valve. Where I see oil and a little bit of bubbling, is out of this cap on the side. The cap has a slot which would appear you can remove. What I need to know...is there a packing that can be replaced for this cap? If so, I need a part number for the packing. I have not attempted to tighten, as I am unsure if this for some type of adjustment cap as this is a valve. I am maintenance literate, but I want to know what I am up against before I rip and tear. I will attempt to load a photo of someone elses valve that I found. I didnt take a photo of mine.

km1125 · Post by **km1125** » July 16th, 2019, 12:09 pm

I do not believe that's a pressure relief valve. The only 'pressure relief' valve that I'm familiar with is on the steering cylinder at the rudders. I *think* that's just a cap that you're looking at, but I'd have to see a diagram to make sure. I think I have a graphic somewhere that shows that whole thing in an exploded diagram. I think they typically leak at the shaft seal, so make sure that's where the fluid is coming from.

drmax · Post by **drmax** » July 16th, 2019, 12:18 pm

Hello. I found an IPC of this without part numbers. I found what I am describing, is the actual filter element which is inside the valve body. It is a cartridge that goes in the body. There is one on each side. It shows packings, without part numbers. Darn....

km1125 · Post by **km1125** » July 16th, 2019, 12:29 pm

Not sure which helm unit you have, but here's a couple diagrams. #9 in the second one are bleed screws. The rest are the valves.

hynautic_valve_body.jpg

hynautic_valve_body2.jpg

km1125 · Post by **km1125** » July 16th, 2019, 12:34 pm

Here is the whole system. The relief valve is usually down by the reservoir or the cylinder.

hynautic_system.jpg

drmax · Post by **drmax** » July 16th, 2019, 1:06 pm

And now I'm sure what I have is a H-50. A seal kit would not include packing for the cartridge. If you look at item #8, you'll see the parts that go into the block. This is similar to an H-50, only an H-50 I believe has only one filter. So whatever those packings are (which they so inconveniently did not list) is what I need.
And thank you for posting those IPC's. I did find this awhile ago and printed it.

km1125 · Post by **km1125** » July 16th, 2019, 3:58 pm

Aren't those just O-rings that seal those parts?

drmax · Post by **drmax** » July 16th, 2019, 5:03 pm

Spoke with seastar. Apparently the part I'm describing is part of the helm. There is no specific packing listed. Will have to go to napa and have a look. Otherwise will have to redo the system with new style...$$$, or by a refurbished unit.

drmax · Post by **drmax** » July 16th, 2019, 5:05 pm

Not entirely sure until I pull it apart. But by looking at an H-50 for sale online, this part the hoses are attached to is built into the helm. (and I've been calling it the wrong name. It's a pressure relief screw and it a common leakage point. Now just have to find the correct packing part numbers.

bud37 · Post by **bud37** » July 16th, 2019, 7:09 pm

Try a place that does hydraulic cylinders/lines/pumps for machinery, loaders etc....that may just be a generic part, if you can show them.

leaking pressure relief valve

leaking pressure relief valve

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