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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

Ring gap

 
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Old 04-22-2018, 12:55 AM
Mrln45
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Ring gap

Can someone tell me the piston ring gap on a 239 Ford Flathead, Std bore (3.1875)? Is there a formula or is there a standard measurement?
 
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Old 04-22-2018, 05:44 AM
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According to 'Rebuilding the Famous Ford Flathead' by Ron Bishop, the corrrect end gap is .012 to .017 for the 59AB and .010 to .017 for the 8BA. The side gap is .0015 to .003 for both. Gaps are the same for compression and oil rings.
 
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Old 04-22-2018, 06:04 AM
jcslocum
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Your ring kit should have a spec in it. It's usually something like .003-005" per inch of bore. Install in measure in 3 places in the bore and then file to size.
 
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Old 04-22-2018, 02:24 PM
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Thank you!
 
 
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