Manual And Parking Linkage; Comparison Gauge; Modulator Bellows Good; Bringing Modulators Together - Pontiac Grand Prix Service Manual

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PONTIAC SERVICE MANUAL
ENDS TO D€ SOUARE
WITHIN %I"
SCRIBED LINE
'
ROUND O R
FLAT STOCK
Fig. 7E-125 Comparison Gauge
a. Insert a pipe cleaner into vacuum connector pipe as
far as possible and check for presence of transmission
fluid.
b. If transmission fluid is found on pipe cleaner,
replace the modulator.
NOTE:
Gasoline or water vapor may settle in vacuum
side of diaphragm. If this is found without presence of
transmission fluid, modulator should not be changed.
5. Bellows Comparison Check Using a comparison
gauge (as shown in Fig. 7E-125), compare the load of
a known good modulator of the same part number
with the modulator in question, as follows:
a. Install known good modulator on either end of the
gauge.
b. Install modulator in question on opposite end of the
gauge.
c. Holding modulators in a horizontal position, bring
them together under pressure until either modulator
sleeve just touches the line in the center of the gauge
(Fig. 7E- 126).
MOBULATOC'~XRT
NUMBER
COMPARISON
RS IN A HORIZONTAL POS
UTER GAUGE LINE
MODULATOR BELLOWS GOOD
Fig. 7E-127 Modulator Bellows Good
d. The gap between the opposite modulator sleeve
ends and gauge line should be 1/16" or less (Fig.
7E-127). If gap is greater than 1/16", the modulator in
'
question should be replaced (Fig. 7E-128).
6. Inspect modulator valve for nicks or damage.
.
7. Check freeness of valve operation in case bore.
Once the modulator assembly pass& all of the above
tests, it is an acceptable part and should be re-used.
I. MANUAL AND PARKING LINKAGE
I. Inspect parking actuator rod for cracks or broken
spring retainer lugs (Fig. 7E-129).
2. Inspect actuator spring for damage.
3. Inspect actuator for free fit on actuator rod.
4. Inspect parking pawl for cracks or wear, if removed.
5. Inspect manual shaft for damaged threads, rough oil
seal surface or loose lever.
MODULATOR KNOWN GOOD
IN QUESTION
MODULATOR
MODULATOR BELLOWS BAD
Fig. 7E-126 Bringing Modulators Together
Fig. 7E-128 Modulator Bellows Bad