Solid Graphite or bronze impregnated bushing
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=47876
Printed Date: November-15-2024 at 10:50am
Topic: Solid Graphite or bronze impregnated bushing
Posted By: 67 ski nat
Subject: Solid Graphite or bronze impregnated bushing
Date Posted: August-06-2019 at 1:17pm
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I’m rebuilding Sherwood d-65. The shaft end bushing I removed was 100% graphite. However the new one in kit is bronze impregnated with holes of graphite. I’m assuming new design is better. Which is best to use. I have both types. Thx
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Replies:
Posted By: Gary S
Date Posted: August-06-2019 at 2:24pm
Where did you get the rebuild kit? Is it a Sherwood kit? I personally don't know the difference but https://www.pumpvendor.com/Sherwood_D65_D-65_parts.html" rel="nofollow - PumpVendor still shows the graphite one.....
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http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS
95 Nautique Super Sport
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Posted By: 67 ski nat
Date Posted: August-06-2019 at 6:00pm
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Looks like really good major kit. Got at a marine pump supply Florida. All parts look quality and fit good. The bronze impregnated looks well engineered. I understand the solid graphite ones can crack or shatter when pressing in.
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Posted By: Gary S
Date Posted: August-06-2019 at 6:46pm
I imagine it could break graphite is brittle. We will have to wait for Pete, he’s the engineer 🤓. Personally I would rather the bushing wear than the pump shaft , I just wonder if the bronze is harder than the graphite
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http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS
95 Nautique Super Sport
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Posted By: 67 ski nat
Date Posted: August-06-2019 at 7:24pm
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We are on same page with thinking. Bronze perforated looks high tech. But sometimes old school materials are better. Hhmmm
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Posted By: MrMcD
Date Posted: August-06-2019 at 11:20pm
Impregnated Bronze is old school. It is used in most Old engines as a pilot bearing for the clutch shaft. It is tough, works and I have not seen any tranny shafts worn due to running in the Bronze pilot bearing. I assume the mention of impregnated means this is an oilite bearing? Oilite bearings were cooked in oil so they would lubricate as they wear.
On the automotive side they tell you to test the bronze with a magnet. If it is magnetic they say it is a cheap copy, if not magnetic you are good. Also look for a darker color showing it has been heated and impregnated with oil. The shiny bronze or brass look will work but you have to heat it yourself and cook it in the oil which wastes time.
I have done this and you can achieve the desired result but it is messy and takes time.
I used our old Coleman cook stove to do this outside, reducing fire danger. Put some oil in a old coffee can, enough to competely cover the bushing when you drop it in and heat it over the fire till it is very hot, oil nearly catching fire. Drop your bushing in and let it cook, 20 minutes to a half hour and remove and let cool. Once cool it is ready to install. Do not cool it, let it cool naturally.
Graphite may be better in this application but I don't see the bronze option as being bad.
Many electric motors run with this same bronze type bushing as bearings.
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Posted By: 8122pbrainard
Date Posted: August-06-2019 at 11:21pm
Bronze bushings of all sizes and shapes and even flat wear plates with plugs of graphite have been around for lots of years especially in the tool and die area. The bronze with the graphite plugs is superior to the sold graphite and don't worry about the wear on the shaft. Go for it!
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/diaries/details.asp?ID=1622" rel="nofollow -
54 Atom
/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique
64 X55 Dunphy
Keep it original, Pete
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Posted By: MrMcD
Date Posted: August-06-2019 at 11:29pm
Pete you typed faster! I agree with you.
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Posted By: 67 ski nat
Date Posted: August-07-2019 at 12:14pm
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You guys are great. Knew I would get good advice. I used word ‘impregnated ‘ and actually it is a bronze plugged with graphite type. I will use it thx much
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