Plymouth Gran Fury 1980 Operating Instructions And Product Information page 54

52
Scheduled Maintenance
Fuel System and Underhood Rubber and
Plastic Components-Emission Hoses (Schedule B)
At mileage indicated on the Mai n tenance Chart, inspect surface
of hoses fo r evidence of heat a nd mech anical damage. Hard and
brittle rub ber, cracking, checki ng, tears, cu ts, abrasion , and ex-
cessive swelling indicate deterioration of the rubber. Particular
attention should be given those hose surfaces nearest to high heat
sources, such as the exhaust manifold.
Inspect hose routing to insure h ose does not come in con tact with
any heat sou rce or moving compon ent which will cause heat
damage or mechanical wear.
Inspect all hose connections such as clamps and couplings to
make sure they are secure and no leaks are present. Hoses should
be replaced immediately
if
there is evidence of degradation that
could result in failure.
Tappet Adjustment 6-cylinder engines
(Schedule A & B)
At the time indicated on the Maintenance Chart, check tappet
clearances and adjust tappets to specifications as ou tlined in the
service manu al. Id le speed should be rechecked after setting the
tappets.
Crankcase PCV Valve- Check Operation
(Schedule B)
Proper operation of this valve depends
on it being free from sticking or
plugging due to deposits. As the vehicle
mileage increases, the PCV valve, h ose, and
passages may accum ulate these deposits. At
the mileage indicated in the Maintenance
Chart, have the va lve checked for proper
operation. If the valve is plugging or sticking, replace it with a
new valve. DO NOT ATTEMPT TO CLEAN THE OLD VALVE!
Crankcase PCV Valve - Replace (Schedule B)
At the mileage indicated in the Maintenance Chart, replace with a
new valve. DO NOT ATTEMPT TO CLEAN THE OLD VALVE!
Vapor Storage Canister Carbon Filled (Schedule B)
At mileage indicated in the Maintenance Chart, rep lace the filter
element in the base of the canister w ith a new fil ter ele ment. The
element should be replaced more often if the vehicle is d riven
under dusty conditions.
Manifold Heat Control Valve (Schedule B)
For fast engine warm-up and smooth acceleration, the valve that
controls h eat flow in the manifold mus t work freely. At the
mileage ind icated, the manifold heat control va lve should be 1
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