cylinder ring "rust" marks....a solution ???

Discussion in 'Help Wanted' started by pp-admin, Mar 16, 2016.

  1. pp-admin

    pp-admin Member

    i currently have a lovely old reciprocating piston compressor on my bench.

    i have something of a dilemma with the cast iron cylinder bore.

    overall the whole pump has done very litlle work and has no far so good !!

    problem is that it was standing for many years and the cylinder bore has annular rust pitting around where the static piston rings came to rest and then spent decades not moving....its not bad and the bore is otherwise clean and has no wear. somehow the cast iron piston and all its rings are very very good.

    what do i do about the rust pits in the cylinder wall. i guess they are no more than 1mm deep at worst.

    i wonder if i just give the bore a damn good honing then they will clean up ok but there will still be pitting so, i guess, a loss of compression. these pits are staggered as per the ring configuration but the good thing is that they are not vertical pits but annular horizontal ones.

    cant really decide if a rebore and oversize rings is the best practice way to go or just a honing....any thoughts ???

  2. highrange

    highrange Member

    I'm no expert, but I'd have thought that the simpler option of a good honing would be worth trying first..... only if that proves unsuccessful would you need to go to the trouble and expense of a rebore and new parts. (just my thoughts - no experience!)

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