The Ford Barn

Russ/40 · 05-18-2020, 12:47 AM

I have run into a problem on an engine I am currently building. The block is a '41 with the sleeves pulled and bored to std. 3 3/16." The problem is when it was bored, no chamfer was made to remove the portion of the top most bore area that the original sleeve sat upon. With my spring compressor when I try to run the piston down, the lower steel ring portion of the oil ring snaps into this small depression around the bore preventing me from getting the piston fully down the bore.

I'm using the spring steel type of compressor. Any ideas to bypass this obstruction and get the piston and rod down the bore without damaging the rings?

My pistons are 4 ring. The bottom oil ring is no problem, but the upper oil ring with the expander setup is the problem.

05-18-2020, 12:47 AM	#1
Russ/40 Senior Member Join Date: May 2010 Location: Santee, California Posts: 3,505	Engine Builders Question I have run into a problem on an engine I am currently building. The block is a '41 with the sleeves pulled and bored to std. 3 3/16." The problem is when it was bored, no chamfer was made to remove the portion of the top most bore area that the original sleeve sat upon. With my spring compressor when I try to run the piston down, the lower steel ring portion of the oil ring snaps into this small depression around the bore preventing me from getting the piston fully down the bore. I'm using the spring steel type of compressor. Any ideas to bypass this obstruction and get the piston and rod down the bore without damaging the rings? My pistons are 4 ring. The bottom oil ring is no problem, but the upper oil ring with the expander setup is the problem.