Fuel Filter; Ignition Systems - Carburetion & Turbo Systems Vortec 5700 Operation And Maintenance Manual

Radiator: Inspect the exterior of the radiator for obstructions. Remove all foreign material with
a soft brush or cloth. Use care to avoid damaging the core fins. If available, use low-pressure
compressed air or a stream of water in the opposite direction of the normal airflow.
Check all hoses and connections for leaks and replace if cracked, frayed or spongy.
Fan Belts: The water pump is usually belt driven. The same belt may also drive the fan and (or)
the alternator. Belts should be properly adjusted at all times. A loose belt can cause improper
alternator fan and water pump operation, and can also cause overheating.
Serpentine Belt: Some engines utilize serpentine belts on the front of the engine. This type of
belt system incorporates a belt-tensioning device, which keeps the belt at the proper tension.
This belt should be checked regularly for cracks or "checking" on the groove side of the belt. If
a problem is apparent, the belt must be replaced.
V-Type Belt: V-Type belts are generally tensioned by adjusting the alternator, or through a
mechanical belt tensioner. The belt is generally correctly tensioned when there is % inch of
depression on the belt between the water pump and the crankshaft pulley.
FUEL FILTER
Carbureted Engines: On carbureted engines, an in-line filter is incorporated into the fuel
supply line. It is recommended that this filter be changed every 250 hours or every 6 months
whichever occurs first.
IGNITIONS SYSTEMS
There are three types of ignition systems used on the GM Powertrain engines.
Solid State Electronic Distributor
Solid State Electronic Distributor with Electronic Control Unit (ECU)
Distributor-less Electronic Ignition with ECU
Please refer to the General Specific chart to determine the ignition system used on your
particular engine.
Ignition Timing: Proper adjustment of the ignition timing must be obtained to provide the
optimum engine power output and economy.
Spark Plugs: Spark plugs should be replaced at the recommended intervals described in the
Maintenance Schedule. Use only the recommended spark plug or an equivalent as described in
the General Specifications, where you will also find the gap specifications.
When removing spark plugs, always note which cylinder each spark plug came out of.
Inspection of the spark plug can detect engine problems. Look at the porcelain around the center
electrode of each plug. If there are glossy brown deposits, that cylinder is burning excess oil.