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camshaft removal difficulty

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John Keele
honda305.com Member
Posts: 2
Joined: Thu Jan 28, 2016 7:06 pm

camshaft removal difficulty

Post by John Keele » Thu Jan 28, 2016 11:21 pm

I'm a new member here. On a CA77 with 17k odometer miles showing, the camshaft turns freely in the four bearings until I turn it very slowly and then I can feel some 'catchiness'. So I'm trying to remove the camshaft to check if one or more of the bearings should be replaced. I have the left-threaded 'camshaft locking nut' unscrewed from its threads and the ramped 'locking bolt' tapped loose. I have tapped the bearing closest to the points end of the head to where it is half out of casting and the next bearing in has followed so that it is also half out of its position in the casting. And the spline end of the cam is moving freely. The other cam half has not moved.
At this point the cam and bearings that are half removed should be able to be tapped the rest of the way out, correct? But the accessibility 'angle' has increased to where I cannot contact the outer bearing race with my punch to finish tapping the bearing and cam the rest of the way out. What 'tool' do you use to finish this removal?
John K.
in Indiana

48lesco
honda305.com Member
Posts: 721
Joined: Tue Mar 06, 2007 1:45 pm
Location: Olmsted Twp, Ohio

Post by 48lesco » Fri Jan 29, 2016 2:55 pm

JK - You can tap the inner race the rest of the way. I use a brass rod. You're transmitting the shock to the inner race of the inner bearing anyway unless you've been hitting the inner and outer equally. It's not an elegant process. Good news is that they are common bearings, and it's probably best to replace them anyway. Welcome to the forum!
-48

John Keele
honda305.com Member
Posts: 2
Joined: Thu Jan 28, 2016 7:06 pm

Post by John Keele » Fri Jan 29, 2016 3:45 pm

Thanks, 48. Good advice. I'll also facilitate things a little with a heat gun too. Thanks for the 'hand-holding' to get me satisfied I wasn't missing something.

John K.

48lesco
honda305.com Member
Posts: 721
Joined: Tue Mar 06, 2007 1:45 pm
Location: Olmsted Twp, Ohio

Post by 48lesco » Fri Jan 29, 2016 4:07 pm

You're welcome. The last time I did one of those, I found that hitting the side of a cam lobe with the brass drift worked pretty well too. If you have a Christmas Ale left over, that can also remove some of the anxiety...

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