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Old 12-10-2012, 08:38 PM   #1
Dave
 
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Country: UK
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Trim pump O-ring size

Just wondering if anyone can help me out sizing an O-ring on the trim pump of my Merc 150 XR2.

During the last season we found that when the engine was trimmed right down the pump pee'ing hydraulic oil out the top seal. On opening he pump up it was found that the top O-ring had perished.

I checked with the usual dealers and to get a replacemnt KIT is £90 or there abouts!! i don't want to pay this since I am only replacing one ring, not a complete rebuild.

i have access to O-ring suppliers or even make my own up but due to the deformation of the original ring its difficult to ensure I get the right size.

Can anyone please tell me the inside diameter and rubber diameter of the O-ring highlighted in the attached file. I think its 73mm and 2.5mm but as I said, I cannot be 100% sure due to the condition.
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Old 12-10-2012, 10:58 PM   #2
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oring size

Hi,
The inside diameter size of this oring is 2.8 inches (71.12mm) the cross diameter is 2.26mm. made in nitrile shore 70-75 , I guess.
Coming from quicksilver kit : power trim oring kit 25-48462A2.

the closest reference at your Caterpillar dealer is reference 3K-4025 nitrile shore 75 ID= 71.12mm, but for this reference the cross diameter is 2.62mm(may be a bit too much)
For other people i've added the drawing with all diam to avoid ordering the expensive kit.
note: the cross diameters are not inscribed on this document.

hope that helps.
Bruno
Attached Files
File Type: pdf 25-48462A2 power trim oring kit.pdf (668.2 KB, 89 views)
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Old 12-10-2012, 11:20 PM   #3
Dave
 
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Country: UK
Location: Scotland
Occupation: Offshore Seismic Surveyor
Interests: Boats of any shape or size
Boat name: Miss-T
Boat make: Ring 21B
Engines: 200 XR2
Cruising area: Loch Earn

Join Date: Feb 2006
Location: Scotland
Posts: 239
Thanks Bruno - thats will help no end.

I will go have a look at our catalogues and see what I can find

Cheers
Dave
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Old 28-04-2015, 07:25 PM   #4
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O-ring cross-section size for part # 'e' of power trim kit

Quote:
Originally Posted by Frenchbruno View Post
Hi,
The inside diameter size of this oring is 2.8 inches (71.12mm) the cross diameter is 2.26mm. made in nitrile shore 70-75 , I guess.
Coming from quicksilver kit : power trim oring kit 25-48462A2.

the closest reference at your Caterpillar dealer is reference 3K-4025 nitrile shore 75 ID= 71.12mm, but for this reference the cross diameter is 2.62mm(may be a bit too much)
For other people i've added the drawing with all diam to avoid ordering the expensive kit.
note: the cross diameters are not inscribed on this document.

hope that helps.
Bruno
Hi Bruno,

Would you happen to know the o-ring thickness or cross-section of o-ring listed as 'e' in the power trim o-ring kit 25-48462A2?

I need to replace mine but don't need the entire kit...

Cheers, Sledd
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Old 28-04-2015, 07:41 PM   #5
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ring piece

BS149 2.62mm Section 71.12mm Bore NITRILE 70 Rubber O-Rings Simply Bearings Ltd
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Old 29-04-2015, 09:10 PM   #6
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Wrong o-ring

Thanks dejasouth, but I'm interested in the thickness of the 0.989 inch ID o-ring listed on the o-ring kit of 25-48462A-2...
Do you know what that is?

Thanks, sledd
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Old 04-05-2015, 04:56 AM   #7
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Talking Found it!

Quote:
Originally Posted by Sledd View Post
Thanks dejasouth, but I'm interested in the thickness of the 0.989 inch ID o-ring listed on the o-ring kit of 25-48462A-2...
Do you know what that is?

Thanks, sledd
FYI, it turns out to be a standard o-ring size 0.989" ID x 1/16", nitrile part number 022 by Daemar Inc., 3 cents each.
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