Buick LeSabre 1965 Service Manual page 365

SUPER TURBINE "400'
TROUBLE DIAGNOSIS 5 - 1 5 1
3. Strainer assembly - plugged
or leaks at neck; "O" ring miss-
ing or damaged.
4. Pump assembly - regulator or
boost valve sticking, cross leak.
5. Pump to case gasket damaged
or incorrectly installed.
C. Case - cross leaks, porosity.
D. Forward and direct clutches
slipping (if burnt, look for cause).
E. Lo sprag - assembled wrong,
sprags turned over.
Via Slips 1-2 Shift - (Install
pressure gauge)
A. Oil level incorrect (refer to
Service Manual).
B. Oil pressure (refer to table
for specifications).
1. Vacuum modulator assembly
defective.
2. Modulator valve sticking.
3. Pump pressure regulator valve
stuck.
C. Front accumulator
1. Oil ring damaged or missing.
D. Control valve assembly
1. 1-2 accumulator valve train
(may be slip-bump).
2. Porosity in valve body or case.
E. Rear accumulator - oil ring
missing or damaged, case bore
damaged.
F. Pump to c a s e g a s k e t -
mispositioned.
G. Case
1. Intermediate clutch plug -
leaking excessively.
2. Porosity between channels.
H. Intermediate clutch
1. Lip seals missing or damaged;
clutch plates burnt.
2. Case center support - leak in
feed circuit (oil rings damaged
or grooves defective, or exces-
sive, leak between tower and
bushing).
DC. Rough 1-2 Shift - (Install 1. Piston seals leaking.
pressure gauge)
A. Oil pressure - (refer to oil
pressure table for specifications).
1. Vacuum modulator - check for
loose fittings, restrictions in line,
modulator assembly defective.
2. Modulator valve stuck.
3. Pump - regulator or boost
valve stuck.
4. Pump to case gasket - off
location or damaged.
B. Control valve assembly
1. 1-2 accumulator valve train.
2. Valve body to case bolts loose.
3. Wrong gaskets or off location -
damaged.
C. Case
1. Intermediate clutch ball miss-
ing or not sealing.
2. Porosity between channels.
D. Rear servo a c c u m u l a t o r
assembly
1. Oil rings damaged.
2. Piston stuck.
3. Broken or missing spring.
4. Bore damaged.
X. Slips 2-3 Shift - (Install pres-
sure gauge)
A. Oil level
B. Oil pressure low - (refer to
o i l p r e s s u r e t a b l e s for
specifications).
1. Modulator assembly.
2. Modulator valve.
3. Pump pressure regulator valve
or boost valve; pump to case
gasket - off location.
C. Control valve assembly
1. Accumulator piston pin - leak
at swedged end.
D. Case
1. Porosity.
E. Direct clutch
2. Case center support - oil seal
rings damaged; excessive leak
between tower and bushing.
XI. Rough 2-3 Shift - (Install
pressure gauge)
A. Oil pressure - high (refer to
o i l p r e s s u r e t a b l e for
specifications).
1. Modulator assembly defective.
2. Modulator valve sticking.
3. Pump - pressure regulator or
boost valve inoperative.
B. Front servo a c c u m u l a t o r
assembly
1. Front a c c u m u l a t o r spring
missing, broken.
2. Accumulator piston stuck.
XII. No Engine Braking - Inter-
mediate Range - 2nd Gear
A. Front servo a c c u m u l a t o r
assembly
1. Servo or accumulator oil rings
or bores leaking.
B. Front band
1. Front band broken, burnt,
(check for cause); not engaged
on anchor pin and/or servo pin.
XIIL No Engine Braking - Lo
Range - 1st Gear
A. Control valve assembly
1. Lo-Reverse check ball miss-
ing from case.
B. Rear servo
1. Oil seal ring, bore or piston
damaged; leaking apply pressure.
2. Rear band apply pin short,
improperly assembled.
C. Rear band
1. Rear band - broken, burnt,
(check for cause), not engaged
on anchor pins or servo pin.
NOTE: Items A, B, C, will also
cause slips in Reverse or no
Reverse.