Finally had some time work work on the one that wasn't making good compression. Sure enough, the rings were rusted stuck on the pistons.
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So I dropped them into some small containers of diesel to soak.
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Next I stripped the unit down to the block
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After moving the engine to a work table, I pulled all the guts out. Plenty of rust everywhere.
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I then gave both bores a good hone. There is still a little but of pitting, it is much better than before. Hopefully it will run got a good number of hours before the grooves that rustystud was talking about. I then soaked the block in degreaser and then gave it a good cleanse with the power washer, and then promptly dried it with compressed air and then sprayed it with WD40.
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Did the same to the crank:
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Next I cleaned up the various parts with a brush and diesel solution.
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Pulled the pistons and with quite some effort, I got the rings off. They broke in many pieces, but I was anticipating that, and have oversize ones already on hand. I'll be custom fitting those to the bores.
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I think I want to polish the journals on the crank and cam. There was some surface rust in some places and what not. What should I use?
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Next I need to work on the lifters. I'm taking them apart one by one (so they don't get out of order) and soaking them in diesel to release the inner piston.
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So pretty good progress this weekend. Hopefully I'll have some time during the week to start putting everything back together.