Posted by used red MN on August 04, 2023 at 11:57:50 from (68.46.31.28):
In Reply to: ford 850 rebuild posted by dreid52 on August 04, 2023 at 09:46:43:
I have a Motors brand manual from the early 70s for heavy duty trucks in the back. In the back I t has these farm tractor spec pages as you can see in the picture it shows a varying allows clearance of 0.0004 - 0.002 in. so what you are showing us should be well within that spec. It does not show a 850 but the line above my fingers shows an 801, 901 which has the same 172 engine as is shown by the 3.90 inch bore shown in the first column. The old mechanic that showed me how to overhaul engines told me to use this little trick as a final check. When you get the rod torqued take a small hammer and tap on it on the outside of where the bolt goes through, kind of at an angle. Small taps like youre trying to smash grains of salt on a steel plate. While youre doing this, hold the rod between your thumb and forefinger and feel for movement sideways and watch as well. Tap it from both directions, should move back and forth by the amount of side clearance it has. If you get this sideways movement the rod is loose enough to run just fine.
Editing to add: If the hammer test does not show movement then there should be concern and measures taken to investigate the problem before the final assembly is complete and ready to move on with installation of the pan etc.
This post was edited by used red MN on 08/04/2023 at 10:06 pm.
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