17
IMPORTANT:
The fuel cylinder manual valve contains an
Excess Flow Check Valve. Open the manual
valve slowly to prevent activating the Excess
Flow Check Valve.
19. Check for leaks at the inlet and outlet
fittings
using a soapy solution or an electronic leak
detector. If leaks are detected make repairs.
Check coolant line connections to ensure no
leaks are present.
20. Start engine recheck for leaks at the regulator.
21. Dispose of any drained material in safe and
proper manner.
AIR FUEL MIXER/THROTTLE CONTROL
DEVICE MAINTENANCE AND INSPECTION
IMPORTANT:
The Air Fuel Mixer components have been
speci
fically designed and calibrated to meet the
fuel system requirements of the emission certi
fied
engine. The mixer should not be disassembled or
rebuilt. If the mixer fails to operate or develops a
leak the mixer should be replaced with the OEM
recommended replacement parts.
When inspecting the mixer check for the following
items:
Leaks at the inlet fitting.
Fuel inlet hose for cracking, splitting or chaff-
ing, replace if any of these condition exist.
Ensure the mixer is securely mounted.
Inspect air inlet hose connection and clamp.
Also inspect inlet hose for cracking, splitting or
chafing. Replace if any of these conditions ex-
ist.
Inspect Air cleaner element according to the
Recommended Maintenance Schedule found
in this section.
Check Fuel lines for cracking, splitting or chaf-
ing. Replace if any of these conditions exist.
Verify Throttle Body return action to ensure
throttle shaft is not sticking. Repair if neces-
sary.
Check for leaks at the Throttle Body and in-
take manifold.
EXHAUST SYSTEM AND CATALYTIC
CONVERTER INSPECTION AND
MAINTENANCE
IMPORTANT:
The exhaust system on this emission certi
fied en-
gine contains a Heated Exhaust Gas Oxygen
Sensor (HEGO) which provides feed back to the
ECM on the amount of oxygen present in the ex-
haust stream after combustion.
The measurement of oxygen in the exhaust
stream is measured in voltage and sent to the
ECM. The ECM then makes corrections to the
fuel air ratio to ensure the proper fuel charge and
optimum catalytic performance. Therefore, it is
important that the exhaust connections remain
secured and air tight.
IMPORTANT:
The HEGO sensor is sensitive to silicone based
products. Do not use silicone sprays or hoses
which are assembled using silicone lubricants.
Silicone contamination can cause severe damage
to the HEGO.
When inspecting the Exhaust system check the
following:
Exhaust manifold at the cylinder head for
leaks and that all retaining bolts and shields (if
used) are in place.
Manifold to exhaust pipe fasteners to ensure
they are tight and that there are no exhaust
leaks repair if necessary.
HEGO electrical connector to ensure connec-
tor is seated and locked, check wires to
ensure there is no cracking, splits chafing or
“burn through.” Repair if necessary.
Exhaust pipe extension connector for leaks
tighten if necessary
Visually inspect converter to ensure muffler is
securely mounted and tail pipe is properly
aimed.
Check for any leaks at the inlet and outlet of
the converter.
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