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Old 07-05-2015, 11:05 PM   #1
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Need power steering o ring size

Can someone tell me the correct o-ring sizes for the shaft and adjuster knob please??

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1983 Present 42 Sundeck
Twin Lehman 135's
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Old 07-06-2015, 01:54 AM   #2
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I don't know, but why not invest $25 in a kit that will cover every o-ring you will ever use on your boat.
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Old 07-06-2015, 04:57 AM   #3
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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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Old 07-06-2015, 04:59 AM   #4
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Sorry- just read your post again. I actually have oring kits already, just want to avoid the possibility of a non standard size.


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Old 07-06-2015, 10:05 AM   #5
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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.
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Old 07-06-2015, 11:01 AM   #6
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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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Old 07-06-2015, 02:20 PM   #7
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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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Old 07-06-2015, 11:47 PM   #8
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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.


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Old 07-07-2015, 01:10 AM   #9
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I doubt the shaft seal is an oring. Those are not used on rotating shafts. Usually it is a lip seal. Best getting it from mfr or pull it and read number off of it.
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Old 07-07-2015, 10:00 AM   #10
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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.
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Old 07-07-2015, 10:03 AM   #11
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here is a picture
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Old 07-07-2015, 01:57 PM   #12
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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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Old 07-07-2015, 02:15 PM   #13
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Quote:
Originally Posted by obthomas View Post
here is a picture
In this picture the o-ring is red . That usually means it's silicon . Silicon o-rings are used for higher temps or maybe certain oils . Does it need to be silicone ?
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Old 07-07-2015, 02:47 PM   #14
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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
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Old 07-07-2015, 03:02 PM   #15
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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/1RG...150707190041:s
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Old 07-07-2015, 04:01 PM   #16
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Quote:
Originally Posted by Pack Mule View Post
In this picture the o-ring is red . That usually means it's silicon . Silicon o-rings are used for higher temps or maybe certain oils . Does it need to be silicone ?
I do not know if it needs to be silicon or red. I have an entire set of step by step pictures on how to overhaul a capilano. This was one of those pictures.
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Old 07-07-2015, 04:03 PM   #17
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another
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Old 07-07-2015, 04:07 PM   #18
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Old 07-07-2015, 06:52 PM   #19
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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...


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Old 07-08-2015, 10:15 AM   #20
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Turns adjuster us a #7, and main shaft is a #15. Both at home depot.
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