My Willys 3A and 3B Community

Your Projects => Your CJ-3A Project => Topic started by: JeepFever on March 16, 2015, 11:13:54 PM

Title: The preservation of Hoover's engine
Post by: JeepFever on March 16, 2015, 11:13:54 PM: I wish this was the preservation of the original engine,ï¿½ but the engine that I acquired with Hoover had a cracked cylinder.ï¿½ . . I bought a replacement engine that "ran when I pulled it",ï¿½ but the PO stored it outside under a tarp,ï¿½ and it suffered water damage.

The engine would not turn over,ï¿½ ï¿½this is what I found when I pulled off the head.
(http://thecj2apage.com/forums/uploads/4918/IMG_5789.JPG)

I was able to free up the engine,ï¿½ but obviously with this much rust in the cylinders,ï¿½ I needed to disassemble and check for the extent of the damage.

The pistons are removed, and the cylinders honed.ï¿½ I am going to try to preserve this engine, without sending to machine shop.ï¿½ It is very clean inside,ï¿½ so was obviously rebuilt recently.ï¿½ The crank and rod bearings are in very good condition.
Title: Re: The preservation of Hoover's engine
Post by: JeepFever on March 16, 2015, 11:45:52 PM: I need to order a gasket set for sure, probably a few valves, and a set of piston rings (broke a couple when removing from #1 & #2 pistons). I am wondering what size rings to order. The pistons have 030 stamped on the top, so that would seem to indicate this engine was bored .030 over.

I did some measurements with a 30 year old dial caliper, and snap gage. My skills at measuring may not be extremely precise, but this is what I am seeing.

Top of piston:
3.131 to 3.136

Bottom of piston:
3.141 to 3.152

Cylinder bore:
3.150 to 3.158

If these measurements are accurate, should I order new rings, .030 over?

Measuring tools: