Case Extension; Modulator And Valve; Checking Concentricity O F Sleeve; F. Front And Rear Bands - Pontiac Grand Prix Service Manual

TURBO HYDRA-MATIC-M-40
73-43
2. Inspect splines for damage.
3. Inspect ground bushing journals for damage.
4. Inspect snap ring groove for damage.
5. Inspect orificed cup plug pressed into one end of
mainshaft. Be sure it is not plugged and oil lubrication
holes are open.
F. FRONT AND REAR BANDS
1. Inspect lining for cracks, flaking, burning or
looseness.
2. Inspect bands for cracks or distortion.
3. Inspect end for damage at anchor lugs or apply lugs.
G.
CASE EXTENSION
1. Inspect bushing for excessive wear or damage. If
replacement is necessary, proceed as follows:
a. Install Tool J 2 1465- 17 and remove bushing.
b. Using Tool J 21465-17 with Drive Handle J 8092,
install new bushing flush to .010" below oil seal
counterbore.
c. Stake bushing in place, using Tool J 21465-10 in
diamond area of bushing lube groove.
2. Inspect gasket mounting face for damage.
3. Inspect housing for cracks or porosity.
4. Be sure rear seal drain back port is not obstructed.
H.
MODULATOR AND VALVE
1. Inspect modulator assembly for any signs of
bending or distortion (Fig. 7E- 122).
rMODULATOR CAN
I
MODULATOR
SLEEVE
ROLL MODULATOR O N FLAT SURFACE TO DETERMINE IF THE
SLEEVE IS CONCENTRiC TO THE MODULATOR CAN.
IF THE SLEEVE IS BENT,RUNOUT WILL BE VISIBLE.
Fig.
7E-122
Checking Concentricity o f Sleeve
VACUUM C
Fig. 7E-123
Vacuum Modulator Seams and Seal
a. Roll main body of modulator on a flat surface and
observe the sleeve for concentricity to the body.
b. If sleeve is concentric and the modulator valve is
free within the sleeve,the modulator is acceptable.
2. Atmospheric Leak Check (Fig. 7~-123)
-
a. Apply a liberal coatin of soap bubble solution
(available at 5c-10c store
+ '
to vacuum connector pipe
seam, crimped upper to lower housing seam and to the
threaded screw seal.
b. Using a short piece of rubber tubing, apply air
pressure to the vacuum pipe by blowing into tubing
and observe for leak bubbles.
c. If bubbles appear, replace the modulator.
CAUTION:
Do nor use any method other than humun
lung power for applying air pressure as pressures over 6
psi may damage the modulator.
3. Inspect O-ring seal seat for damage.
4. Vacuum Diaphragm Leak Check (Fig. 7E-124)
BELLOWS
DIAPHRAGM
Fig.
7E-124
Cross Section of Vacuum Modulator