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Compressor quandry

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John Rudd:
I was gifted a single phase 14cfm air compressor recently.
First issue was the motor, the start cap had failed....so motor no worky.... :zap:
Got a new cap from the usual market place for under a tenner......
Next problem, the pressure/ stop-start switch didnt feel very well, the on off action was a bit suspect, so a new one acquired from Machine Mart.....another 20 quid.....
So now I got a compressor that runs but aint pumping well..... :scratch:
So I lifted the head.....oh dear, a broken exhaust valve petal.....so stripped the top end and removed the cylinder block too.....oh my, the piston doesnt look well....so I removed the piston from its rod....gudgeon pin badly scored too....in fact it wasnt it had picked up on the little end eye of the con rod.
Well after cleaning up the piston, signs of it nipping up above the top ring, polishing the gudgeon pin, I put it all back together....had to wait for a gasket set and replacement valve petals got it running....
Now its knocking from the top end, I think its due to the excessive clearances of the gudgeon pin in the little end eye and the piston bosses....
Now a new piston/ pin/ conrod is going to run to £50.....
I'm guessing that considering the amount of oil in the crankcase, all these failures are due to a lack of it..... :coffee:

I know this is a freebie, but any thoughts in going any further with it?
Its turning into a money pit..... :Doh:

Joules:
You now have a tank you can use with another compressor    :med:

AdeV:
Would now be a good time to try your hand at turning your own piston?

Or, if you don't fancy going that far, why not turn up a bush for the little end pin to run in? If you can make it a press-fit, then ream it to size in situ, so long as you get it dead nuts it should run better than it does now; and if it doesn't, it's not like you're going to harm it any worse than it already is...

John Rudd:
Guys thnx for the replies....
I had considered another pump...£89 from fleabay, two things jump out at me.....one is the bolt hole mount detail, not really an issue....the second is the flywheel size....again not insurmountable but its faffing about with it....

I had considered reaming the conrod and fitting a bush, but it would need some careful planning and good machining to get it right....a new piston eh? Hmmm doable but I aint got ang ally bar big enough at the moment, piston is 65 mm, not exactly small....
So what about the gudgeon pin? Would EN8 be any good?

Spurry:
Well...if it was mine...I would complete the strip-down and see EXACTLY which parts would be needed to make a decently operating machine. Then do the sums to see if it's worthwhile.

FWIW
Pete

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