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Honda 400/4 camshaft design is it normal?
McCabe-Thiele (Ted):
I was a little surprised to find that the camshaft does not have replaceable bearings as it appears to run directly in the alloy head & camshaft cover. Fortunately my bearing surfaces look good. If needed how do you repair the worn housings?
AshimotoK0:
--- Quote from: Macabethiele on November 19, 2020, 03:31:26 PM ---I was a little surprised to find that the camshaft does not have replaceable bearings as it appears to run directly in the alloy head & camshaft cover. Fortunately my bearing surfaces look good. If needed how do you repair the worn housings?
--- End quote ---
You get a replacement head and cam cover. There was a project bike in Cassic Bike magazine that had been modified to use shell bearings off a Villiers industria engine but an extremely tricky maching operation to fit them I imagine..
discussed here:
http://www.sohc.co.uk/index.php/topic,7175.0.html
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McCabe-Thiele (Ted):
Wow that sounds expensive to buy a head & cam cover. On my old 850 A series engine you could get the block line bored and later bearings fitted.
AshimotoK0:
--- Quote from: Macabethiele on November 19, 2020, 04:50:25 PM ---Wow that sounds expensive to buy a head & cam cover. On my old 850 A series engine you could get the block line bored and later bearings fitted.
--- End quote ---
Quite often the cam cover is OK and the scoring is only in the head. Agree pretty expensive to fix, so rule no.1 ... change oil regularly. Worst model for this happening is the CB250/360G5 IMHO.
Nurse Julie:
The cam cover bearing surfaces are usually fine. It's the cam chain pulling the cam downwards that causes the problem to the head.
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