Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual, Page: 151 / 413

6th
re-issue
Page 16
Overdrive does not release
IMPORTANT-This calls for immediate attention. Do
not reverse car, as selection of reverse in overdrive
can cause extensive damage.
1. Control mechanism out of adjustment or fault
in electrical circuit.
2. Blocked restrictor Jet In valve.
3. Sticking clutch.
4. Damaged parts within the unit necessitating
removal an_d inspection of the assembly.
Clutch slip in overdrive
1. Insufficient oil in gearbox
2. Control mechanism out of adjustment.
3. Insufficient hydraulic pressure due to leaks, or
foreign matter in valves.
4. Worn or carbonised clutch lining.
Clutch slip in reverse or freewheel condition
on overrun
1. Control mechanism out of adjustment.
2. Blocked restrictor jet in valve.
3. Worn or carbonised clutch linings.
4. Insufficient pressure on clutch due to broken
clutch springs.
Hydraulic knock
This knock occurs once per mainshaft revolution
In direct drive and can be eliminated by relieving
the hydraulic pressure in the direct drive position
by scoring the operating valve ball seat in the
casing as follows :-
Remove the operating valve as described on page 19.
Grind a screwdriver blade as shown in Fig. 10 and
Fl1. 10.
Scoring operatlni valve ball
seat
WSH. 124
Section E (Gearbox & Overdrive)
holding it centrally, give a
light
tap, indenting two
grooves in the seating. Alternatively score the
seating with a sharp pointed scriber (one score
should be sufficient if deep enough).
Remove Pump Valve, springs plug and replace with
spring and plug Part No. 5039588.
It Is essential that no foreign matter ls allowed to
enter the unit and that undue force is not used
when striking the tool causing the operating valve
bore to be belled out at the edge of the indents. If
this occurs ream by hand the valve bore with a ¼"
reamer, suitably greased, to clear the obstruction.
Re-assemble the removed components and test.
This does not apply after Laycock Nos. 3082, 3083.
ADJUSTMENT OF CONTROLS
The operation of the. controls can be checked by
means of the hole in the solenoid lever on the
right-hand side of the unit, accessible from under
the car after removal of the cover plate. The
ADJUSTING
NUT
Fla. 11.
Checking
setting
lever position
controls are operating correctly when a ¼"
diameter rod can be passed through the hole in the
solenoid lever Into the hole in the overdrive casing
(see Fig. 11) with ignition switched on, top gear
engaged and the steering column switch in the
overdrive position.
If the solenoid operates, but does not move the
setting lever far enough to allow the rod to be