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› Machining the head for plain bearings?
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Machining the head for plain bearings? (Read 142 times)
chuck
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Machining the head for plain bearings?
01/22/08 at 20:36:51
Anybody ever machined the head for plain bearings for the camshaft to ride on instead of the bare aluminum?
I ask 'cause I now have two heads with trashed journals and I have noticed that good used heads for the LS650 are rare as hens' teeth... and new ones ain't cheap.
If nobody else has done it I may have to pioneer the procedure on one of these here heads of mine.
(Note to self-- if an engine eats up a head, don't go putting another one on it until you've figured out why the engine done gone and et up the first one.)
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jjn
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Re: Machining the head for plain bearings?
Reply #1 -
01/22/08 at 21:30:04
Theres also the possibility of using roller bearings maybe?
jon
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verslagen1
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Re: Machining the head for plain bearings?
Reply #2 -
01/22/08 at 21:51:35
You can put 2 next to the bath tub and they'd get plenty of oil.
But you really need one next to the sprocket.
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Savage_Greg
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Re: Machining the head for plain bearings?
Reply #3 -
01/23/08 at 22:11:52
Got someone that could line bore that puppy? Have to have oil holes lined up too.
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MMRanch
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Re: Machining the head for plain bearings?
Reply #4 -
01/24/08 at 21:28:30
Hi Chuck
The cam bearing on mine were so floppy i couldn't stand to listen to them any more. This last Dec. i rebuilt them. It occoured to me that J.B.WELD is as hard as alumium is. On the head side there is no oil hole, just the exit slot. Well if you clean the bottom bearing surface really good and put a layer of J.B. about .015-.020 thick on and work it onto the surface good as you can, then let it about 2/3 set, you can apply a thin coat of wheel bearing greese to it and gently place the cam on it (no cam chain at this point), then put the top cover on and snug it up. After letting it set overnight take it back apart , clean up the new surfaces with your handy dremmel tool, recoat with greese and your BETTER than new.
I've got about a thousand miles on mine since then and all is well. But if I have to do it again I will use some Briggs and Stration rod bearing cut to fit and J.B. between the bearing and the head (just in case i cut to deep, and so the cam can fit itself instead of being in a bind).
Visit your Small Engine shop. you will need two half bearing .99-to 1 inch, and one half bearing .79 to 13/16 inch
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Savage_Greg
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Re: Machining the head for plain bearings?
Reply #5 -
01/24/08 at 21:59:49
MMRanch wrote
on 01/24/08 at 21:28:30:
Hi Chuck
The cam bearing on mine were so floppy i couldn't stand to listen to them any more. This last Dec. i rebuilt them. It occoured to me that J.B.WELD is as hard as alumium is. On the head side there is no oil hole, just the exit slot. Well if you clean the bottom bearing surface really good and put a layer of J.B. about .015-.020 thick on and work it onto the surface good as you can, then let it about 2/3 set, you can apply a thin coat of wheel bearing greese to it and gently place the cam on it (no cam chain at this point), then put the top cover on and snug it up. After letting it set overnight take it back apart , clean up the new surfaces with your handy dremmel tool, recoat with greese and your BETTER than new.
I've got about a thousand miles on mine since then and all is well. But if I have to do it again I will use some Briggs and Stration rod bearing cut to fit and J.B. between the bearing and the head (just in case i cut to deep, and so the cam can fit itself instead of being in a bind).
Visit your Small Engine shop. you will need two half bearing .99-to 1 inch, and one half bearing .79 to 13/16 inch
That's a new one. Ingenuity plus +
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LANCER
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Re: Machining the head for plain bearings?
Reply #6 -
01/25/08 at 03:39:23
Very impressive indeed
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chuck
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Re: Machining the head for plain bearings?
Reply #7 -
01/25/08 at 15:10:21
And THAT's why this board rocks. Thanks MMRanch, I think I'll give it a try. It's not like I've got anything to lose, and this could save me some serious coin.
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MMRanch
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Re: Machining the head for plain bearings?
Reply #8 -
01/25/08 at 15:21:17
Thank you, thank you very much !
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