Chevrolet 1980 Light Duty Truck Service Manual page 408

6A-4 ENGINE M E C H A N IC A L
k. Check power steering flow control valve operation.
Repair or replace as necessary.
1. Check for clutch slippage (vehicles with manual
transmissions) and adjust or replace as necessary.
m. Check hydraulic brake system for proper operation.
Correct as necessary.
n. Check engine operating temperature. Correct as
necessary.
o. Check pressure
transmission) for proper operation. Repair as necessary.
a. Check base idle speed for improper adjustment and
correct as necessary.
b. Check ignition timing and reset to specifications if
required.
c. Check idle mixture setting and correct as necessary.
d. Check accelerator and choke linkage operation and
correct as necessary.
a. Check connecting rods for improper alignment and
correct as necessary.
b. Check for excessive bearing clearance and correct as
necessary.
c. Check for eccentric or out-of-round crankshaft
journals and correct as necessary.
d. Check for insufficient oil supply and correct as
a. Check for improperly seated or fuel pump gasket.
Replace as necessary.
b. Check for improperly seated or broken push rod
cover gasket. Replace as necessary.
c. Check for improperly seated or broken oil filter
gasket. Replace as necessary.
d. Check for broken or improperly seated oil pan
gasket. Replace as necessary.
e. Inspect gasket surface of oil pan to be bent or
distorted. Repair or replace as necessary.
f. Check for improperly seated or broken timing chain
cover gasket. Replace as necessary.
g. Inspect timing cover oil seal. Replace if necessary.
regulator valve (automatic
ENGINE DIESELING ON SHUT OFF
NOISY CONNECTING RODS
EXTERNAL OIL LEAKAGE
p. Check transmission fluid level. Correct as necessary.
q. Loss of power may be caused by using sub-standard
fuel. Correct as necessary.
r. Check operation of EFE valve as outlined in Section
6E of this manual. Repair or replace as necessary.
s. Check operation of diverter valve (A.I.R. system).
Repair or replace as necessary.
t. Check for engine vacuum leaks. Correct as necessary.
e. Check engine operating temperature and correct as
necessary.
f. Check thermae valve for sticking and correct as
necessary.
necessary.
e. Check for low oil pressure and correct as necessary.
f. Check for connecting rod bolts not tightened
correctly and correct as necessary.
h. Check for worn or improperly seated rear main
bearing oil seal. Replace if necessary.
i. Inspect for loose oil line plugs. Repair or replace if
necessary.
j. Check for engine oil pan drain plug improperly
seated. Correct as necessary.
k. Inspect camshaft rear bearing drain hole for
obstructions. Correct as necessary.
1. Check for loose rocker arm cover. Broken or
distorted cover correct as necessary.
m. Check EFE valve switch for leakage. Replace if
necessary.
n. Check oil pressure switch for leakage. Replace if
necessary.
LIG H T T R U C K S E R V IC E M AN UAL