Operating instructions

8-2
c. Insert governor driven gear (1, Figure 4-23) into its
bearing.
d. Lay camshaft assembly in its bearings in left
crankcase, meshing spur gear teeth with those of
crankshaft gear so that timing marks are aligned in the
manner illustrated in Figure 8-2, and turning governor
driven gear to mesh it with driver gear.
1. Crankshaft gear timing marks
2. Camshaft gear timing mark
FIGURE 8-2. ALIGNMENT OF TIMING MARKS.
e. Measure crankshaft end clearance either with a
feeler gauge or a dial indicator set at zero against the
propeller flange. Measure camshaft end clearance at
either end of its rear main bearing. See Table of
Limits, Section VI, for allowable tolerances.
f. Install idler gear assembly and support pin in left
crankcase as illustrated (Figure 8-1) bushing thrust to
rear.
g. Spread a thin film of No.3 Aviation Permatex on
the left crankcase parting flange. Lay lengths of No.
50 silk thread on parting flange. Thread should be
inside the bolt holes but never on the edge.
h. Stand up odd numbered connecting rods.
i. Lay right crankcase subassembly on the left case.
Take care not to displace or damage the crankshaft oil
seal.
j. Insert (from above) two 8-7/8 inch through bolts
(54, Figure 4-21) at front of crankcase, one 9-13/16
inch through bolt (55) in front of No.5 cylinder mount
pad, seven 10-3/4 inch through bolts (57) through
cylinder mount pads and four 10-1/2 inch through
bolts (56) below camshaft level. Tap all of these
through to centered positions with a non-marring
hammer. These bolts align crankcase castings and
bearings.
k. Install a spacer and flanged nut on each end of the
two front through bolts, a spacer and flanged nut on
top end of two through bolts ahead of No. 5 cylinder
pad and, on bottom end of upper rear through bolt
nearest magneto mount pad.
l. Install fuel manifold valve over crankcase flanges.
Install spacer (22), lifting eye (21) and secure with
attaching parts (20, 19, 18, 17). Install attaching parts
(50 through 53).
m. Install one bolt and washers (42, 43, 44) at left
rear, one "O" ring (48) and two bolts and washers (42,
43, 44) at right rear and one bolt and washer (42, 43)
at right front. Do not tighten any parts in this group
yet.
n. Seat idler gear support pin. The eccentric shoulder
must be away from crankshaft. Do not install
attaching parts yet.
o. Tighten all attaching parts installed in steps "I" and
"m".
p. Install two "O" rings (48), one bolt (49) and
attaching parts (45, 46, 47, 49) in the upper rear case
hole and tighten nut.
FIGURE 8-3. ALIGNMENT OF TIMING MARKS.