Naval jelly to remove slight rust on cylinder walls?

Discussion in 'General Tech' started by IdahoDoug, Jun 13, 2018.

  1. IdahoDoug


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    Aug 9, 2003
    Restoring a 1988 Supra Targa 5 speed with my son. Has not run for 18 years. Beautiful car, terrific big straight 6. Two cylinders have condensation-caused rust spots on the cylinder walls. They must have been the unlucky ones with open valves. At the rings, there is also a slight line of rust.

    I would like to remove the rust best I can, then we will hone the cylinder walls with a ball hone and re-ring this low mile engine. If I don't remove the rust first, I don't think the ball hone I bought will work like the traditional actual hone stones, which would knock down a high spot better. The ball hone is more "flexy" and I'd be afraid it would not place higher pressure on a high spot, thus leaving possible remains of a high spot.

    I've got a piece of right diameter PVC I was going to gently work these problem areas with before honing, using some mild abrasive. However I got to wondering if Naval Jelly would dissolve it and physically remove the substance that is mildly proud on the cylinder walls (the rust).

    Anyone have experience - does it truly chemically dissolve the red rust deposits and based on your experience with it, would this be a good move? It will be a bare block, so no pistons and I can easily clean any residue.

    Thanks in advance.
  2. badlander


    Likes Received:
    Sep 2, 2010
    Sarasota, Florida
    I've used naval jelly many times and although it has its place, for your purpose I think I would just go ahead and clean it up with 400 or 600 wet/dry paper depending on the condition. Use kerosene or any light oil as a lubricant to help keep the paper from clogging. Hone after cleaning up. Naval jelly is pretty weak stuff as far as rust disolvers go. If it is just a dusting of light surface rust it is pretty effective but any crusty stuff and you would be wasting your time.
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