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7th March 2011
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Flat Track Racer
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Join Date: Aug 2010
Posts: 245 Sportster/Buell Model: XLH Sportster/Buell Year: 1968
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Cam bearings
It looks like someone buggered this up pulling the cam bearings. Is there something I should do to this exposed cast aluminum to keep little pieces from breaking off in the case? What is the red stuff coating the rough cast aluminum on the bottom half of the crank housing?
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7th March 2011
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Master Bike Builder
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Join Date: Aug 2008
Posts: 2,041 Sportster/Buell Model: 71 xlch Sportster/Buell Year: 73 Sportster/Buell Model #2: 74 xlh Sportster/Buell Year #2: 74 Other Motorcycle Model: BT rigid hand shift
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that looks odd...maybe the PO welded up some spider cracks around the bores there? You can Dremel tool grind those edges smooth...the casting should not flake off....is there any minor cracks around the cam journal cores????
I had a case half with re-welded cam journals.....it was a fix for cracks around the journal...
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7th March 2011
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Flat Track Racer
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Join Date: Aug 2010
Posts: 245 Sportster/Buell Model: XLH Sportster/Buell Year: 1968
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No other cracks and the bearings were in nice and tight before I pressed them out. My theory is maybe a gear puller was used and the feet did that. So when smoothed out, I shouldn't worry about the pours aluminum?
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7th March 2011
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Master Custom Bike Builder
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Join Date: Mar 2006
Location: Athens, GA
Posts: 3,171 Sportster/Buell Model: XLCH Sportster/Buell Year: 1962
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I've seen discussions of the red stuff, but can't remember what it is. It serves to reduce the porosity of the aluminum and prevent the oil from penetrating and coming out the other side (the outside).
Edit: It's called glyptal. ( http://xlforum.net/vbportal/forums/s....php?t=1018719)
http://www.glyptal.com/ |
7th March 2011
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Senior Chief Master Mechanic 1st Class
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Join Date: Dec 2009
Location: Neither here nor there
Posts: 1,285 Sportster/Buell Model: XLCH (mongrel) Sportster/Buell Year: 1972
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When you dremel off the edges of the bores, do not touch the bore inside diameter. I might even just scrape the edges clean with a knife and not dremel them. If the case already had bearing in it and the edges didn't crack, then they are not likely to crack now. Make sure the new bearings are centered in the wall on the smooth bearing bore - not hanging out over the rough edges. I think your manual has some information on the position of the newly installed bearings.
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BBRRAPPPP-snick-BRRAAAPPPP-snick-BBRRAAAPPPPP-snick-BBRAAAPPPPPP...
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7th March 2011
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Flat Track Racer
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Join Date: Aug 2010
Posts: 245 Sportster/Buell Model: XLH Sportster/Buell Year: 1968
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Thanks guys.
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7th March 2011
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Master Bike Builder
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Join Date: Aug 2008
Posts: 2,041 Sportster/Buell Model: 71 xlch Sportster/Buell Year: 73 Sportster/Buell Model #2: 74 xlh Sportster/Buell Year #2: 74 Other Motorcycle Model: BT rigid hand shift
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yeah...that is glyptal...and I was told harley actually painted the inside of sporty cases back in the 50's and early 60's with the stuff.......
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8th March 2011
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Know It All
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Join Date: Nov 2009
Posts: 197 Sportster/Buell Model: 1965 xlrtt replica Other Motorcycle Model: 1986 suzuki gsxr 750
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It looks like the bearings have been pressed from the outside towards the inside of the caseing and breaking off the little locating flanges. The bearings must always be pulled OUTWARDS, some locktite may be necessary to stop the new bearings from wandering inwards towards the rotating flywheel which would equal disaster..........Davi.
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8th March 2011
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Know It All
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Join Date: Nov 2009
Posts: 197 Sportster/Buell Model: 1965 xlrtt replica Other Motorcycle Model: 1986 suzuki gsxr 750
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Patrick, (the french owl) has a different fix for this as he had difficulties with locktite for this application in the past.........Davi.
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8th March 2011
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Senior Master Custom Bike Builder
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Join Date: May 2007
Location: Puget Sound--Washington State
Posts: 3,838 Sportster/Buell Model: Sportster XLH Sportster/Buell Year: 1961 Sportster/Buell Model #2: Sportster XL Sportster/Buell Year #2: 1957 Other Motorcycle Model: XLH 62, 65, 68, FLH 1970
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Quote:
Originally Posted by fergerburger
yeah...that is glyptal...and I was told harley actually painted the inside of sporty cases back in the 50's and early 60's with the stuff.......
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When I cracked my 57 cases, presumably for the first time ever, the inside was coated. Many engine builders still do it. Early aluminum casting can weep. You get oil coming right through the cases.
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When everything is as it was in my childhood
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