GMC 1976 ZEO 6083 Maintenance Manual page 270

IMPORTANT -
Delcotron generator equipped vehicles cannot be push-started
when battery or starter are inoperative, because unlike a conventional generator,
there is no residual magnetism in the rotor.
GENERAL BATTERY
Neutral safety switch (Automatic
Transmission).
Check dipstick for congealed oil, improper
viscosity, or presence of water in oil.
Remove spark plugs to check for hydro-
static lock (liquid in combustion chamber) .
ELECTRICAL
Check ignition switch and wiring .
Bad or corroded connections.
Undersized battery cable .
Poor ground .
Oil viscosity too heavy.
MECHANICAL
Tight bearings, rings, pistons, etc.
IGNITION
Engine timing and dwell.
ENGINE WILL NOT TURN OVER
See "Battery Diagnosis Charts" .
STARTER
See "Starter Diagnosis Charts" .
MECHANICAL
Seized bearings, rings, .and or pistons.
ENGINE TURNS OVER SLOWLY BUT DOES NOT START
GENERAL BATTERY
See "Battery Diagnosis Charts" .
STARTER
See "Starter Diagnosis Charts".
NOTE :
Most conditions under "Does Not Start" may also cause hard starting
when cold .
FUEL (3) (4) (8)
ENGINE
6A- 5
ENGINE TURNS OVER AT NORMAL SPEED-STARTS HARD WHEN
COLD (2) (7)
If condition occurs only when ambient
temperature is below 32°F ., check for ice
restriction in the fuel supply system . If
necessary, thaw system and add anti-icing
additive to the fuel . (5)
NOTE :
In cold weather cranking speed is reduced by thickening of oil and reduc-
tion of battery efficiency .