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Joined: Apr 2012
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Today I changed the camshaft bushes on my 69 T100R engine.
The old ones came out using a M22 tap. The new ones went in straight with a homemade drift.
But although the workshop manual says the bushes will have the correct size after installation the camshafts sitting very tight. So I have to ream the bushes.
The triumph manual list a special reamer but I´ve never seen this tool.
It is available from Britcycle but there must be an other way to bring in the right clearance 0.0010" to 0.0025".
What size of reamer will I need? (only metric stuff here at home)

Best regards, Martin

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I think the important thing is that they are line reamed.

I think people use an adjustable reamer but no idea of the size.

I read somewhere recently that a respected expert felt that cambushes rarely wore out so he never bothered changing them as a routine job. (sorry!)

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No sorry needed. But my camshaft bushes were worn. It has had too much clearance.
An adjustable will not fit when the bushes are installed.
But I googled and found out that a 13/16" reamer would work. (The search finction of this board didn´t found something...) So I have to make an adapter for the line reaming first I think.
Thank you!

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the tool is a ball bearing sized to fit you push it thru , followed by the ream ..with a shoulder on it cut to fit in the first bush then lines up the second bush for a ream with the cutting part , works good


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I've looked for the tool in the UK, but it only seems to be available in the US/Canada?

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Quote
the tool is a ball bearing sized to fit you push it thru


Not exactly, the ball is used on the 650-750 twin bushes to size them.

LG all you need to do is make a bushing the o.d. that is the i.d. of the timing side camshaft bearing in the case and an i.d. of the o.d. of the reamer's shaft.You will need a little bit of clearance to allow the reamer to turn in the bushing. The bushing should be a thumb press into the case.

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Hello John!
That´s the way I will do it.
I ordered the 13/16" reamer yesterday and when it arrives I will make the bushing.
Regards, Martin


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