The Ford Barn - View Single Post - Perch Bolt Diameter? Drop in or Press in?

H. L. Chauvin · 10-19-2014, 06:30 PM

Old Model A perch bolts that have been installed for a long period can be almost impossible to remove.

For removal, many resorted to heating same & hammering them out which tends to make the diameter fatter mostly on the threaded end.

Appears one is .015" larger than the other, so .007" would have to be removed from the outer surface to make them equal -- could one be slightly oval in lieu of round and/or, are there any burrs in the hole or on the bolt?

This may not make a difference, but always worth a try; e.g., did you try to swap perch bolts from L to R or R to L ?

If it were mine, I would polish the hole & the bolt with plumber's sandpaper & try it again & investigate if any irregularities -- if need be, remove metal with a flat file -- once installed properly it will not move.

10-19-2014, 06:30 PM	#2
H. L. Chauvin Senior Member Join Date: May 2010 Posts: 4,179	Re: Perch Bolt Diameter? Drop in or Press in? Old Model A perch bolts that have been installed for a long period can be almost impossible to remove. For removal, many resorted to heating same & hammering them out which tends to make the diameter fatter mostly on the threaded end. Appears one is .015" larger than the other, so .007" would have to be removed from the outer surface to make them equal -- could one be slightly oval in lieu of round and/or, are there any burrs in the hole or on the bolt? This may not make a difference, but always worth a try; e.g., did you try to swap perch bolts from L to R or R to L ? If it were mine, I would polish the hole & the bolt with plumber's sandpaper & try it again & investigate if any irregularities -- if need be, remove metal with a flat file -- once installed properly it will not move.