Joey Mack Posted 14 hours ago Share Posted 14 hours ago Gotcha. Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/19/#findComment-588858 Share on other sites More sharing options...
Joey Mack Posted 14 hours ago Share Posted 14 hours ago I may be wasting your time, but since they are 1 pc. Pistons, can you slide a ring less piston in to take the measurements? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/19/#findComment-588859 Share on other sites More sharing options...
Freightrain Posted 14 hours ago Author Share Posted 14 hours ago Guess I'm confused....why? I bore gaged the cylinder and miced the piston. I have clearances that I question. Are you thinking I should use feeler gages? Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/19/#findComment-588863 Share on other sites More sharing options...
Joey Mack Posted 4 hours ago Share Posted 4 hours ago Yes to feelers. Not trying to confuse you, just curious myself. My gut tells me you are good. Especially with your skills. Im also assuming you have long feelers or metal shim paper like I have. Ill take a break for a bit. Still waiting for other comments. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/19/#findComment-588866 Share on other sites More sharing options...
Freightrain Posted 2 hours ago Author Share Posted 2 hours ago I am just confused why feelers would be more accurate then using micrometers and a bore gauge. Both should give the same basic results if done correctly. Unfortunately I don't have long feeler gauges, as I have never had a need for them. I measured the old pistons and they are 4.867/4.868. Those were running on a bore of 4.875(on size and negligible wear). That gives it +.003 more clearance on average. Maybe I am splitting hairs but I don't want to have to do this twice! Thousandths make a difference. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/19/#findComment-588867 Share on other sites More sharing options...
fjh Posted 8 minutes ago Share Posted 8 minutes ago 2 hours ago, Freightrain said: I am just confused why feelers would be more accurate then using micrometers and a bore gauge. Both should give the same basic results if done correctly. Unfortunately I don't have long feeler gauges, as I have never had a need for them. I measured the old pistons and they are 4.867/4.868. Those were running on a bore of 4.875(on size and negligible wear). That gives it +.003 more clearance on average. Maybe I am splitting hairs but I don't want to have to do this twice! Thousandths make a difference. So did you check the ring gap in the bores? if you did did you have to file any ends If not put this question in a a dark corner and move on! You can stu for ever on this ! Joey mentioned puting in a piston with out rings that is a good thought! But what is the min- max measurement with that method just a gut feel ! I have a gut feel as well and it is if it ran before it will run again ! if these pistons are the old ones they will be fine if they came with a kit they should be fine if they are what you ordered! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/19/#findComment-588874 Share on other sites More sharing options...
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