Pontiac tempest 1968 Service Manual page 535

7F-34 1968 P O N T I A C SERVICE M A N U A L
F i g . 7 F - 1 0 6 Pump Passages
used in the transmission oil at the assembly plant
and will Indicate if oil leak Is from transmission.
If available, the use of a "Black Light" to locate
point at which oil is leaking is helpful. Comparing
oil from leak to that on engine or transmission dip­
stick, when viewed by black light, will determine
source of leak — engine or transmission.
Oil leaks around engine and transmission are
generally carried toward the rear of car by the air
stream. For example, a transmission oil filler tube
to case leak will sometimes appear as a leak at the
rear of transmission. In determining source of leak,
proceed as follows:
1. Degrease underside of transmission.
2. Road test to get unit at operating temperature.
3. Inspect for leak with engine running.
4. With engine off, check for oil leaks due to the
raised oil level caused by drain back.
F i g . 7 F - 1 0 7 Pump to Case Passages
F i g . 7F-108 Case to Pump Passages
B . POSSIBLE POINTS O F OIL L E A K S
1. Transmission Oil Pan Leak
a. Attaching bolts not correctly torqued.
b. Improperly installed or damaged pan gasket.
c. Oil pan gasket mounting face not flat.
2. Rear Bearing Retainer
a. Attaching bolts not correctly torqued.
b. Rear seal assembly damaged or improperly
installed.
c. Square seal, extension to case, damaged or
improperly installed.
d. Porous castings.
3. Case Leak
a. Filler pipe O-ring seal damaged or missing;
misposition of filler pipe bracket to engine.
b. Modulator assembly O-ring seal damaged or
improperly installed.
c. Solenoid connector O-ring seal damaged or
improperly installed.
d. Governor cover - bolts not : torqued, - gasket
damaged or leak between case face and gasket.
e. Speedometer gear O-ring damaged.
f. Manual shaft seal damaged or improperly
installed.
g. Line pressure band release tap plug loose.
h. Vent pipe.