92-20-22
MAGNETO GEAR SUPPORT SHAFT. The magneto gear support shafts should be removed from
the crankcase, cleaned and inspected using the same procedure outlined for rocker shafts
72-
20-05.
Refer to dimensions given in Table of Limits to determine if shafts are serviceable.
72-20-23
MAGNETO AND ALTERNATOR DRIVE COUPLINGS. TCM recommends
100%
replacement of
magneto drive coupling roller bearings and all rubber drive bushings at engine overhaul.
Inspect drive gear teeth for excessive wear, pitting or corrosion. Clean and inspect steel parts
using magnetic particle inspection.
Refer to the Table of Limits for serviceable limits and
tolerances.
72-20-24
TACHOMETER DRIVE HOUSING. Remove the oil seal with a suitable puller. If the housing
counterbore is scored, smooth it with crocus cloth. Spread a film of grade
50
MHS 27 oil on
the perimeter of a new seal, then press the seal squarely into the housing with its lip outward
facing the oil source.
72-20-25
STARTER DRIVE ADAPTER.
The clutch spring sleeve is pre-shrunk and doweled into the
housing. If
it
is necessary to remove the needle bearing in the adapter, a removing driver
may be purchased (See Section
1-20-01
Tools Figure 45).
Check oil feed holes to the starter adapter shaftgear.
Hole diameter must be
.0918-.0968
to reduce possibility of clogging and causing lubrication loss
to the starter adapter clutch spring. The oil feed hole comes off the rear cam bearing of the
1-3-5
crankcase half and intersects a short hole in the center of the needle bearing counter-
bore. Hole can be enlarged to diameter shown above after removal of the starter adapter.
72-20-26
OIL PUMP ASSEMBLY. Replace worn gears, bushings and studs. Nicks on parting flanges
may be stoned out.
The pump gear chamber must not be enlarged. If
it
is scored or the
driven pump gear pilot shaft is loose, TCM recommends
100%
replacement of the accessory
case.
Heavy scoring on the gear contact area of the oil pump cover renders this part
unserviceable and replacement is mandatory.
72-20-27
IGNITION CABLE. All ignition cable assemblies or harness assemblies must be replaced at
each overhaul. If the high tension outlet plates are in good condition, new cable assemblies
may be installed on them. On TCM harness assemblies, push the cable end through the outlet
plate and install the inner ferrule, grommet and outer ferrule (eyelet) onto cable center wire.
On Slick harness assemblies, push the cable end through the outlet
plate and install the
tapered drive ferrule, press drive ferrule into outlet plate, install insulator sleeve, spring on
electrode screw and screw into cable end.
Observe the
"1"
mark on the exterior side of each outlet plate adjacent to the No.
1
cable
outlet hole, (Refer to Figure
72-20-27),
and observe that the numerals appearing at the spark
plug ends of the high tension leads indicate the cable to cylinder position. Complete installa-
tion of high tension cables into outlet plate insuring their proper location according to wiring
diagram
72-20-27.
Refer to Chapter
74
for further information regarding magnetos and
ignition harnesses.
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