Industrial 1.6L General Information 0-17
Coolant Level - Continued
Use only a permanent-type coolant when refilling or flushing the coolant system.
Recommended ethylene glycol mix 52/48 is normal up to a maximum of 60% glycol, 40% water.
Refer to the mixture chart on the container for additional antifreeze protection information. DO NOT use alcohol or
methanol antifreeze, or mix them with the specified coolant.
Plain water may be used in an emergency (except in freezing temperatures), but replace it with the specified coolant
as quickly as possible to avoid damage to the system.
Radiator
Inspect the exterior of the radiator for obstructions. Remove all bugs, dirt or 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 air flow.
Radiator Hoses
Check all hoses and connections for leaks. If any of the hoses are cracked, frayed, or feel spongy, they must be
replaced.
Fan Belts
The water pump is usually belt driven. The same belt may also drive the fan and/or the alternator. The drive belts
should be properly adjusted at all times. A loose belt can cause improper alternator, fan and water pump operation, in
addition to overheating.
Serpentine Belt
Some GM Powertrain 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 routinely for cracks or ‘checking’ on the groove side of the belt. If cracks or ‘checking’ are
apparent the belt must be changed.
V-Type Belt
V-Type belts are generally tensioned by adjusting the alternator position, or through a mechanical belt
tensioner. The belt is generally correctly tensioned when there is an ½ inch of depression on the belt between the
water pump and the crankshaft pulley.
FUEL DELIVERY SYSTEM MAINTENANCE
Fuel Filter Replacement
Carbureted Engines
On carbureted engines, an in-line fuel filter is incorporated into the fuel supply line. It is recommended that this filter be
changed every 250 hours or every 6 months which ever occurs first.
TBI Engines
On PSI Fuel Injection or Fuel Injection/Dual Fuel two fuel filters are used in the gasoline fuel supply line to the engine
TBI unit. A coarse fuel filter is located in the supply line between the fuel tank and the electric fuel pump. This filter
protects the fuel pump from debris in the fuel tank. This filter must be changed every 200 hours or every 6 months
which ever occurs first.
A primary fuel filter is located between the fuel pump and the TBI unit on the engine. This filter protects the injectors
from microscopic particles in the fuel which can cause plugging of the injectors. This filter MUST be changed every
500 hours or annually which ever occurs first.
Zenith Z.E.E.M.S. TBI Fuel Injection
Zenith Z.E.E.M.S. TBI Fuel Injection requires an in-line fuel filter in the fuel supply line from the fuel tank to the TBI
unit, ahead of the electric fuel supply pump. This filter must be changed every 400 hours or every 6 months which ever
occurs first.
On engines equipped to run on LPG, the in-line fuel filter must be replaced every 800 hours.
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