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Hi Tmoose, Thanks for that. Yes, the main journal has an oil groove and the big ends are fed from a drill way from the main journal - but that's the engine design and short of fitting a race bearing in way of the timing side journal and a quill to take the oil directly into the big ends...

Hi Ken, yes, worn bearings do have a tendency to reduce oil pressure but that's why I'm after the best material I can find to help reduce the wear. When I rebuild an engine I know the tolerances are good - by the way, my enquiry relates entirely to engines I rebuild and I do not mean to suggest...

Thanks for the useful link Ken, CMA1 rings a bell!! I agree entirely with the running oil pressure notion, but as the oil gallery is a fixed volume and the pump speed increases with engine speed, an oil pump would have to be really knackered not to maintain running pressure (on these engines it...

Thanks Ken. I imagine with vertically split crancases there will be a whole range of issues but suffice to say many "home mechanics" do not get the cases aligned satisfactorily, I doubt I could get them much better and know a little bit about it!! In a nutshell, it's not a good design but we...

Thanks Pressed, I will look closely at the Garlock link - it seems phosphor bronze is probably the material to stick with! Thanks to all who have contributed - I'm very grateful for your input.

Thanks Patprimmer, the notion is a sound one, but the main problem is that these engines go back over 50 years and many of the cranks are on their last regrinds so altering the crank journal is just not an option. In fact, what I say to those that ask me, is to recommend they find a machinist...

Thanks Kenre. I was just wondering if there was anything better (more modern) than phosphor bronze but I agree, it is a suitable material. The original bush was some sort of bronze coated steel backed shell pressed into a steel holder that, in turn, was pressed into the crankcase. Most of the...

Thanks Kenre for your involvement. The bushings are pressure lubricated and the oil pump delivers the oil charge into a gallery surrounding the bush. The oil is then fed into the bush by way of drillings in the bush. The oil is then fed into the crankshaft from the main bearing bush, so part...

Thanks Metalguy, where can I get "oilite" and what is it? I presume it is easily machinable or would I need to provide the manufacturers with finished product dimensions (as you will know, these bushings require reaming to fit after being pressed into the crankcases).

I run a couple of old BSA motorcycles and they use a plain bearing bush on one side of the crankshaft as a main bearing (the other side is a roller bearing). Since BSA went to the wall in 1973, the replacement bearings currently available are rubbish - little better than brass! Can anyone...