Hi Net Yesterday I made good progress on the engine buildup. Fitting the cam gear to the cam took longer then I anticipated. First I had to determine which cam gear to use. Each gear is marked with a number and shop tells me that the range is from minus to plus numbers. I sat the crank in position on a case half and placed the cam and gear in place. The object is to rotate the crank and see if the cam tries to lift out of it's bearing shells, or if there is slop between the cam and crank gear. My original engine used a -2 gear and the engine with the 71mm crank used a -4 gear. The -4 gear was too sloppy and the -2 gear was good. Next came the bolts for the cam gear which were larger then the rivets in the original gear. Also the heads of the bolts had to be trimmed to clear the oil pump. The case as all know has a breather tower which is in the way of the cowling, so next I trimmed the tower removing one inch all around. I also drilled the case to accept a dipstick from the top of the case and not in the front which is sometimes used for both oil filling and the dipstick. Today I plan to install my prop hub to the crank. Before leaving the hanger last night, I placed the crank in the freezer. This morning I will heat the hub and mate the two together. I added a few extra pictures on the engine buildup page at http://kr-2.aviation-mechanics.com/EngineBuildup.htm .
Orma Southfield, MI N110LR Aug 84 - May 04 http://kr-2.aviation-mechanics.com
