Replacing bronze bush in an aluminum alloy casting

[terry lee 2Participant @terrylee2]

Hello all, I have a casting which has 2 bronze flanged bushes installed in the lugs on the casting, these bushes then support a hollow steel throttle control rod.

The rod only turns half a revolution back and forth but due to vibration etc the inner bore of the bushes have worn and need replacing. what I would appreciate advice on is: The bushes are a tight fit! should I heat the casting before attempting to tap out the bushes with a drift of some sort?

Then, I am struggling to find a commercially available replacement bush and so will have the replacements machined, question is, how do I ensure the replacements are a tight fit? presumably they will need to be machined slightly larger than the aperture? and the casting heated before inserting the bush. If my assumption is correct how many thou bigger should the O/D of the bush be machined? or is there another way of ensuring a proper fit?

Thanks in advance of any advice.

Terry

[terry lee 2Participant @terrylee2]

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