Kevin's Engine Overhaul Project

Engine Disassembly: Bottom End

A torque wrench was used to measure the torque required to unbolt the rod nuts. All nuts broke loose at slightly over 40lb-ft. To protect the rod journal during piston removal, a 6in piece of used 3/8in fuel hose was fitted to one of the exposed rod bolts.

Although not shown, first clean off the carbon deposit at the top of the cylinder above the top ring. A wire rotary brush with the piston near TDC works good. Then, place a long wooden dowel as shown and landed on one of the piston's wrist pin bosses, gently bang or tap on the dowel to drive it out of the piston hole. Be sure to have your (or a helper's) hand ready to catch the piston when it comes loose. This is easiest with the engine rotated with one bank horizontal on the engine stand.

Visually and with a bare finger, inspect the surfaces of the rod bearings and crank rod throw journal. Most of the rod bearings in Kevin's engine were excellent like this one shown.

3 of the upper rod bearings were like this. There were no corresponding marks on the crank journal. New rod bearings will be needed.

After checking all the rings on all the pistons, 2 of the 2nd compression rings were broken and 1 of the top compression rings was broken. Rings have to be replaced anyway and fortunately, there was no or very little scaring on the cylinder wall from the broken ring edge.

Back to Kevin's Engine Project
Back to Kevin's 1955 400 Project
Return to Projects Front Page