Ford COUGAR 1968 Shop Manual page 166

PART 6-1
-
General Transmission Service
FIG. 5
(Continued)-Diagnosis Guide-Transmissions
TROUBLE SYMPTOMS
NOISY IN FORWARD
S P E E D S
(Continued)
NOISY IN REVERSE
LUBRICANT LEAKS
POSSIBLE CAUSES
5. Mainshaft gears worn or dam-
aged. (In. any case of scored or
broken gears, the mating gears should
be checked).
6. Countershaft gear or bearings
worn or damaged.
7. Failure of the operator to fully
engage the gears on every shift be-
fore engaging the clutch and apply-
ing engine power.
Gear roll-over noise, inherent in
manual transmissions, is caused by
the constant mesh gears turning a t
engine idle speed, while the clutch is
engaged and the transmission in neu-
tral; and throwout bearing rub are
sometimes mistaken for
mainshaft
bearing noise.
Gear roll-over noise will disappear
when the clutch is disengaged or
when the transmission is engaged in
gear. Throwout bearing rub will dis-
appear when the clutch is engaged.
In the event that a bearing is defec-
tive, the noise is more pronounced
while engaged in gear under load or
coast than in neutral. When com-
plaints of this nature are encountered,
it will be necessary to road test the
vehicle to determine if bearing noise
exists.
Under no circumstances
should any transmission rework be
attempted to eliminate gear roll-
over noise, or throwout bearing rub.
I. Reverse idler gear or shaft,
worn or damaged.
2. Reverse sliding gear worn or
broken.
I. Excessive lubricant.
2. Vent plugged.
3. Input shaft bearing retainer
loose or cracked, seal or gasket dam-
aged.
4. Worn or damaged extension
housing seal.
5. Worn shifter shaft seals.
6. Extension housing bolts not
sealed.
7. Expansion plug at front of
case not seated properly.
8. Access cover loose or gasket
damaged.
CORRECTION
1-2. Replace worn or defective
parts.
1. Drain to bottom of filler plug
hole.
2. Free up.
3. Add sealer and torque retainer
bolts to specifications. Replace de-
fective parts.
4-5. Replace defective parts.
6-7-8. Add sealer to bolts, and
torque to specifications. Replace de-
fective parts.