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POWERGLIDE 19
DIAGNOSIS
Failure
Probable Cause
No drive in any selector position; cannot load engine.
0
Low oil level.
Clogged oil suction screen.
Defective pressure regulator valve.
Oil pump defective.
Input shaft broken.
Oil pump priming valve stuck.
Engine speed flares on standstill; starts but acceleration lags.
0
Low band partially applied:
a. Low oil level.
b. Clogged oil suction screen.
c. Improper band adjustment.
d. Servo apply passage blocked.
e. Servo piston ring broken or leaking.
f. Band facing worn.
g. Low band apply linkage disengaged or broken.
h. Converter stator not holding (rare).
Engine speed flares on upshifts.
0
Low oil level
Improper band adjustment.
Clogged oil suction screen.
High clutch partially applied blocked feed orifice.
High clutch plates worn.
High clutch seals leak.
High clutch piston hung up.
High clutch drum relief ball not sealing.
Vacuum modulator line plugged.
Transmission will not upshift.
0
Low band not releasing, probably due to:
a. Stuck low-drive valve.
b. Defective governor.
c. Throttle valve stuck or maladjusted.
d. Maladjusted manual valve lever.
Upshifts harsh.
0
Incorrect carburetor-to-transmission TV rod adjustment.
Improper low band adjustment.
Vacuum modulator line broken or disconnected.
Vacuum modulator diaphragm leaks.
Vacuum modulator valve stuck.
Hydraulic modulator valve stuck.
Closed throttle (coast) downshift harsh.
0
Improper band adjustment.
High engine idle speed.
Downshift timing valve malfunction.
High mainline pressure. Check:
a. Vacuum modulator line broken or disconnected.
b. Modulator diaphragm ruptured.
c. Sticking hydraulic modulator valve, pressure
regulator valve or vacuum modulator valve.
Will not downshift.
0
Sticking low-drive shift valve.
Low-drive shift plug stuck.
High governor pressure.
Low TV pressure.
