Chevrolet 1980 Light Duty Truck Service Manual page 410

6A-6 ENGINE M E CHA NICAL
a. Check for weak springs and replace as necessary.
b. Check for improper valve lifter clearance and adjust
as necessary.
c. Check for improper valve guide clearance and/or
worn valve guides and correct as necessary.
d. Check for out-of-round valve seats or incorrect valve
seat width and correct as necessary.
e. Check for deposits on valve seats and/or gum
formation on stems or guides and correct as necessary.
f. Check for warped valves or faulty valve forgings and
a. Check and adjust valve lash if necessary.
b. Check for excessively worn, dirty or faulty valve
lifters. Replace if necessary.
c. Check for worn valve guides. Repair as necessary.
d. Check for excessive run-out of valve seat or valve
face. Repair as necessary.
a. Check for excessive piston to bore clearance. Correct
as necessary.
b. Inspect for improper fit of piston pin. Correct as
necessary.
c. Inspect for excessive accumulation of carbon in
combustion chamber or on piston tops. Clean and/or repair
as necessary.
d. Check for connecting rods alignment. Correct as
a. Check for undersize pistons. Replace if necessary.
b. Check for wrong type and/or size rings installed.
Replace if necessary.
c. Check for tapered or eccentric cylinder bores.
Correct as necessary.
d. Check connecting rod alignment. Replace if
necessary.
e. Check for excessively worn ring grooves. Replace if
necessary.
f. Check for improperly assembled piston pins. Replace
BURNED, STICKING OR BROKEN VALVES
NOISY VALVES
NOISY PISTONS AND RINGS
BROKEN PISTONS AND/OR RINGS
correct as necessary.
g. Check for exhaust back pressure and correct as
necessary.
h. Check improper spark timing and correct as
necessary.
i. Check excessive idling and correct as necessary.
e. Check for worn camshaft lobes. Replace camshaft
if necessary.
f. Inspect for pulled or loose rocker arm studs. Repair
or replace as necessary.
g. Check for bent push rods. Replace if necessary.
h. Inspect for broken valve spring. Replace if necessary.
necessary.
e. Inspect for excessive clearance between rings and
grooves. Repair or replace as necessary.
f. Check for broken piston rings. Replace as necessary.
as necessary.
g. Check for insufficient ring gap clearance. Correct as
necessary.
h. Inspect for engine overheating. Correct as necessary.
i. Check for sub-standard fuel. Correct as necessary,
j. Check ignition timing. Correct as necessary.
LIG H T T R U C K S E R V IC E M AN UAL