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cam bearing, mainshaft, roller race, splitting cases

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  #1  
Old 22nd September 2010
ATC ATC is offline
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Default To split or not to split?

Bought a 72 incomplete restoration. Mainshaft roller race has surface rust. Should I hone out and use oversize rollers or press in new? Cost about the same.

2 of the 4 camshaft roller bearings are siezed. Can these be replaced without splitting the cases?

Perhaps the question really is should I trust the pevious builders?- rust + siezed rollers = water +oxygen not good! Cases together are clean and feels tight and nice. Should I split and look? Never touched a harley before but wanted to build a RHS gear Ironhead bobber.
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  #2  
Old 22nd September 2010
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I would split the cases and do the job right. You don't know what other rust might be in there. And if you replace the timing cover cam bushings as well, the cases need to be split to use the RH case to guide the reamer in square, unless yo have a spare RH case to use as a jig.
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  #3  
Old 22nd September 2010
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Quote:
Originally Posted by ATC View Post
Bought a 72 incomplete restoration. Mainshaft roller race has surface rust. Should I hone out and use oversize rollers or press in new? Cost about the same.

2 of the 4 camshaft roller bearings are siezed. Can these be replaced without splitting the cases?

Perhaps the question really is should I trust the pevious builders?- rust + siezed rollers = water +oxygen not good! Cases together are clean and feels tight and nice. Should I split and look? Never touched a harley before but wanted to build a RHS gear Ironhead bobber.
I would clean it up and do a quick brake hone job just to see how bad it really is or is the race severely pitted?
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  #4  
Old 22nd September 2010
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If your heart is in it, I say pull 'em apart and do it all. If you lack at least some mechanical skills, you may wanna have a reputable mechanic do it. Splitting cases can lead to splitting head aches! And there are the tools. Without such it is futile.
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Old 22nd September 2010
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It's a tough call, but if you have some skills and since it sounds as if the tranny is already out, you might consider splitting them.

Do the connecting rods move freely and smoothly? When you say everything is nice and tight, are you referring to rods? If there is no up and down movement, you can probably get away with assembly.

Of course that's the rub--"probably."
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  #6  
Old 23rd September 2010
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All bearings, end play etc, good on the crank. On an old BSA single I would not bother smack togethr and give a couple of rapid oil changes and all OK. Not so for a later Norton twin as these engines run a tighter tolerance. Finding out about ironheads right now.

Cam bushes OK, might replace the big one for the crankshaft end. Do not know S... about HD's never seen one open til now and this came almost ready for rebuilding in 6 boxes. Mostly good but just cant work out why 2 of the cam rollers are siezed- look ok but do not move, soaked in solvent and oil mix but still no move!. Cams look great so I fear rust due to bad storage. Never seen one siezing before not typical for this sort of bearing

No probs with the skill level but working only from exploded diagrams from part listing sheets. What special tools would I need over the basic, I have years of experience on a range of brit iron. Guess there might be a link on this site that describes splitting the cases - can you send me a link.

Thanks for your help
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  #7  
Old 23rd September 2010
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It is really a question of how comfortable are with what the previous owner did? Personally, I don't trust too many other people with my motor.

Is this something that you just plan to put together and then sell? Or do you plan to keep it?

If you do split the cases you'll know how well it gets put back together. You may get lucky and find that there is nothing wrong and it can be put together with peace of mind. But you may also find something that could have been catastrophic.

Side note: This is post 666 for me... Feeling kinda evil... <EG>
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  #8  
Old 20th June 2011
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Default I split

"new" main bearing was BAD. Looks like the previous builder used a heavy bluntish instrument to hammer home - is now concentric. Total rebuld now finished. Why the *** did this guy block off the case vent???

Thanks for thereplies and sorry for the tardy response
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  #9  
Old 20th June 2011
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Quote:
Originally Posted by ATC View Post
Thanks for the replies and sorry for the tardy response
Just 9 months late.
You may want to start a new thread.
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