Critical New Parts Dimensions - Continental Motors GO-300-A Overhaul Manual

TABLE X CRITICAL NEW PARTS DIMENSIONS (cont.)
New Dimension
Part Name Feature
(I nches)
Oil pump driver gear Shaft diameter
0.7160-0.7165
Oil pump driven gear
Shaft diameter
0.7160-0.7165
Oil pump housing and
shaft assembly
Dri ven gear shaft hole
diameter
0.717 -0.720
Drive gear shaft hole
diameter
0.717-0.720
Gear chamber depth
1.002-1. 004
Propeller shaft
Accessory drive bevel
gear
Propeller shaft drive
gear
9-13. SPECIFIC INSPECTIONS.
Bearing diameter
Shaft diameter
Bearing diameter
9-14. CRANKCASE. If any cylinder base nut was
loose at disassembly or if any of the cylinder attaching
studs are bent, even slightly, or if there i~ definite
evidence that a cylinder was loose at any hme, then
it is possible that reversal of stress has fatigued the
studs and through bolts installed on that cylinder pad,
in which case all of them should be replaced. Test for
bent studs with a toolmaker's square. When inspecting
for casting cracks, pay particular attention to areas
on and adjacent to the cylinder mount pads, tappet
guides bottom flange and bearing bosses. Look for
nicks 'on machined surfaces and scoring in shaft
bearings and the shaftgear bushing. The castings must
be clamped together at all attaching pOints before
dimensional inspection of camshaft bearings.
NOTE
If
camshaft bearings are excessively worn,
the crankcase may be line bored to accomo-
date a O. 020 inch oversize camshaft.
9-15. CRANKSHAFT. In addition to magnetic particle,
visual and dimensional inspection, the shaft should be
mounted on matched "V" blockS on a surface plate
(supporting the front and rear main journals) and ro-
tated under a dial indicator placed to bear on the
center main journal in order to detect excessive
bending.
2.247-2.248
0.8120-0.8130
2.247-2.248
9-16. CAMSHAFT. Inspect the journals for scoring,
corrosion and overheating, and lobes for pitting atthe
toes and evidence of overheating or unusual wear.
9-17. CONNECTING RODS. Use a telescoping gauge
and an outside micrometer caliper to measure all
worn bushings and locally-replaced bushings. If a
bushing was replaced locally,
it
is also necessary to
check its alignment with the big end bearing seat.
The Simplest method of making alignment measure-
ments requires a push fit arbor, preferably at least
eight inches long, for the bushing bore and another
for the bearing seat, a surface plate, two matched
"V" blocks and two blocks of ground flat steel stock
of equal height. To measure tWist, insert the arbors
into the rod bores; then lay the big end arbor in the
"V" blocks on the surface plate, and place the ground
steel blocks under the ends of the bushing arbor at a
measured distance apart. A feeler gauge may be
used to detect any clearance at either end under the
bushing arbor. This, divided by the separation of the
blocks in inches, will give the twist per inch of length.
(Refer to limit in Section XV.) To measure bushing
and bearing convergence, mount a dial indicator on
a surface gauge, and Swing the rod around the big
end arbor to the vertical pOSition against a firm stop.
Pass the indicator over the bushing arbor at pOints
an exact number of inches apart. The difference
in readings at the two ends, divided by the distance
between pOints of measurement, again gives the mis-
alignment per inch, as specified in Section XV.
9-18. GEARS. Inspect gear teeth for signs of over-
heating and excessive wear. Normal wear produces
a fine pOlish on the tooth thrust faces. Alteration of
the tooth profiles, score marks and pitting are suf-
ficient cause for rejection.
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