D-17 S IV Gas Overhaul Q

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   We have the gas engine out on a stand.  I bought it from the original owner so I know it was overhauled sometime around 74, but he doesn't remember much.  The sleeves/inserts have a 4 1/8" bore and I have read it came out with a 4" bore.  1.  Should I go back with a 4 1/8 or 4?
2.  Is there someplace better than others to order parts (engine overhaul Kit, etc.)?
  We have pulled the rod bearings and they do not appear to be AC, at least we don't see an AC stamp.  We also can't tell if they are oversized.  We will put a micrometer on the crank Tuesday. (They have an Fm inside a circle, and one has the member 241166 and under that 1  74, another has what appears to be two letters -maybe SS followed by 1-123) Does that mean anything to anyone?   

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KY D-17 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 07 Jan 2024 Location: Onton, KY Points: 39	Post Options Post Reply Quote KY D-17 Report Post Thanks(0) Quote Reply Topic: D-17 S IV Gas Overhaul Q Posted: 31 Aug 2024 at 4:03pm
	We have the gas engine out on a stand. I bought it from the original owner so I know it was overhauled sometime around 74, but he doesn't remember much. The sleeves/inserts have a 4 1/8" bore and I have read it came out with a 4" bore. 1. Should I go back with a 4 1/8 or 4? 2. Is there someplace better than others to order parts (engine overhaul Kit, etc.)? We have pulled the rod bearings and they do not appear to be AC, at least we don't see an AC stamp. We also can't tell if they are oversized. We will put a micrometer on the crank Tuesday. (They have an Fm inside a circle, and one has the member 241166 and under that 1 74, another has what appears to be two letters -maybe SS followed by 1-123) Does that mean anything to anyone?

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DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 20526	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 31 Aug 2024 at 4:27pm
	Original engine from the factory had 4 inch bore pistons at 7.25 to 1 compression ratio. Many after-market overhaul kits are 4 1/8" bore and some are lower compression like 6.5 to 1. Some may be the same compression as factory and 4 1/8" bore. Don't know which kit you have. I do know that 4 inch bore at 7.25 to 1 compression ratio (or higher) will use less gas than 4 1/8" bore at 6.5 to 1 compression ratio. A-C never made any engine bearings. FM is Federal Mogul. Those are A-C part numbers that A-C used.

WF owner Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 May 2013 Location: Bombay NY Points: 4666	Post Options Post Reply Quote WF owner Report Post Thanks(0) Quote Reply Posted: 31 Aug 2024 at 6:56pm
	Make sure you change the cam bearings.