Need power steering o ring size
- Thread starter Forkliftt
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OP
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Forkliftt
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Time. Somewhere in years past I've seen it posted here where the outer oring was matched and replaced allowing for a permanent (somewhat) repair. I'm pretty sure the size was even given. Removing/ disassemble/ and reseal of a complete Capilano pump would be quite an undertaking 
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1983 Present 42 Sundeck
Twin Lehman 135's
. 1983 Present 42 Sundeck
Twin Lehman 135's
I bought the seal kit and it did not include the shaft O-ring. Measure the shaft OD and the housing ID and go to the McMaster-Carr web site. I think I posted the dimensions for ours here one time but not sure anymore. I think the shaft was 3/4" and the housing was 1". McMaster has the dimensions and that will give you the dash number for the O-ring. You can then go to an industrial/hydraulics supply house and buy the O-ring or order from McMaster.
Or...go to your local Grainger, pay a 20% premium for the convenience and timeliness, and get a Buna-N O-ring kit. It will have about 30 different o-rings varying in diameter and thickness. You will not likely ever have to chase down o-rings again. And...you can be that guy at the dock that says "Oh...I think I have one of those on board"...and fixes up your boat buddy who is in the the same predicament you are in now.
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Nomad Willy
Guru
I keep several plastic calipers .. one on the boat and at home. Also in my car for shopping. Seems to me they are about $10. I prefer the ones that have fractions of SAE numbers on the inner scale. With a small magnifying glass one can repeatedly measure quite accurately. You could measure the groove and get the perfect "O" ring.
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Forkliftt
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Thanks Eric and others. I'm pretty sure it was Bob's post that I remembered. I was just hoping that having the O rings in hand could allow me to keep the swap out fast enough that I don't drain the pump and introduce air unnecessary.
1983 Present 42 Sundeck
Twin Lehman 135's
1983 Present 42 Sundeck
Twin Lehman 135's
It is an O-ring, not ideal, but that's what it is. Considering the slow rotation speed of the steering shaft it's an acceptable solution. The shaft bearing is pretty tight so there is not much leakage when you pull out the O-ring although having the new one at hand is a good idea.
Also make sure the shaft is smooth so you don't tear up the new O-ring sliding it into place. On our upper helm somebody in the past had gripped the shaft with pliers, most likely vise grips, and left some significant burrs.
Also make sure the shaft is smooth so you don't tear up the new O-ring sliding it into place. On our upper helm somebody in the past had gripped the shaft with pliers, most likely vise grips, and left some significant burrs.
River Cruiser
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A friend had similar problem on a sea star helm pump. I re-sealed it for him and it still seeped at the shaft, I replaced the oring with a quad seal and that cured it.
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jleonard
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Assuming a petroleum based hydraulic fluid and according to my chemical compatibility chart for o rings, Buna or Viton (expensive) both have an A rating, Silicone has a B rating.
Buna will be the easiest to find.
You do NOT want EPDM
Buna will be the easiest to find.
You do NOT want EPDM
I bought one of these a dozen years or so ago. I have almost always had an o-ring for various uses since:
https://www.grainger.com/product/1R...1RGY1&ef_id=UlQF0AAABBFK4hrA:20150707190041:s
https://www.grainger.com/product/1R...1RGY1&ef_id=UlQF0AAABBFK4hrA:20150707190041:s
OP
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Forkliftt
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Wow. This is great. And it's not even an ANCHOR discussion!! Great pics guys. Quad rings VA O ring vs Viton vs ...
I do like those quad rings. Maybe I end up breaking this down, measuring for a quad ring seal on the shaft and one needed for the adjuster and order them from Hercules...
1983 Present 42 Sundeck
Twin Lehman 135's
I do like those quad rings. Maybe I end up breaking this down, measuring for a quad ring seal on the shaft and one needed for the adjuster and order them from Hercules...
1983 Present 42 Sundeck
Twin Lehman 135's
what_barnacles
Guru
Turns adjuster us a #7, and main shaft is a #15. Both at home depot.
