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PostPosted: Thu Sep 27, 2007 9:51 am 
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1275cc
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Location: Canberra
As per title, do new cam bearings generally need to be reamed once fitted? I only ask as I have one new set here that slide perfectly over the cam, and another one that doesn't which is from a different manufacturer but otherwise looks the same. I'm wondering if it is supposed to be reamed or if it is a dud.


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PostPosted: Thu Sep 27, 2007 11:51 am 
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Location: Sunny Shine Coast, Qld Australia
There are two sorts on the market - 'non reamable' and 'reamable'. Apparently the non reamable can have sloppy tolerances and you run the risk of vibration moving the bearing. This happened in my engine I'm rebuilding - not with me but previous owner as when I pulled it down the centre bearing was 8mm out of the web and had fouled the push rod. The reamable one can be reamed to a tighter tolerance and you end up with a smoother running cam. A special reamer is used that lines all three up as well.

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PostPosted: Thu Sep 27, 2007 7:10 pm 
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Most cam bearings that you could buy now from Karcraft and elsewhere for years, are pre-finished.
I even had a NOS set in a BMC box that is pre-finished.
But you need to be real careful fitting them, or they distort- which is why I pay Graham Russell to fit mine, he has the proper gear. :wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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PostPosted: Thu Sep 27, 2007 8:02 pm 
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By proper gear do you mean the dollies?

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PostPosted: Thu Sep 27, 2007 8:05 pm 
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If that's what you call them, but I'd call them guide spigots and plates.. :wink:
It's easy to bruise and deform them if you try and hit them in without them being guided.

I'd make some guides up if I had a bunch of bearings to do.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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PostPosted: Thu Sep 27, 2007 8:08 pm 
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Yep that paints a picture nicely. Thanks.

I've seen guys do it with three spigots (?) machined to fit the inner diameter of the individual bearing with a shoulder machined half way up. Then they were tapped in. Still easy to misalign I guess.

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PostPosted: Thu Sep 27, 2007 8:12 pm 
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I would put a 16mm hole in all the spigots, then pull them in with a long piece of H/T threaded rod and nuts.. No BFH required. :wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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PostPosted: Thu Sep 27, 2007 8:24 pm 
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You are right, much more elegant.

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