Delkron Twin Ca 117 - Manual (Page 2)

2
A. Fixture crankcases so that cylinder deck is perpendicular to machining
tool
B. Bore crankcase cylinder spigot bore to a finished dimension of 4.310”
diameter (+/- .005”) and a depth of 1.400” (+/- .010”). Note … Bridge
bolt must be removed prior to machining crankcase cylinder spigot
bores. Failure to remove bridge bolt may cause sever damage to
machining tool.
C. Drill crankcase bridge bolt hole in right side case through to a
diameter of .250”, use supplied ¼”x20 bolt in place of stock bridge
bolt during reassembly of engine. Spot face right side crankcase at
through hole to accommodate a ¼” flat washer.