G420E/G424E Tier LP Engine Maintenance Schedule 30
CHAPTER 3 MI- 04 MAINTENANCE SCHEDULE
RECOMMENDED
MAINTENANCE SCHEDULE
Suggested maintenance requirements for an engine
equipped with an MI-04 fuel system are contained in
this section. The owner should, however, develop his
own maintenance schedule using the requirements
listed in this section and any other requirements listed
by the engine manufacturer.
Test Fuel System for Leaks
z Obtain a leak check squirt bottle or pump spray
bottle.
z Fill the bottle with an approved leak check
solution.
z Spray a generous amount of the solution on the
fuel system fuel lines and connections, starting at
the storage container.
z Wait approximately 15-60 seconds then perform
a visual inspection of the fuel system. Leaks will
cause the solution to bubble.
z Repair any leaks before continuing.
z Crank the engine through several revolutions.
This will energize the fuel lock-off and allow fuel
to flow to the pressure regulator/converter.
Apply additional leak check solution to the
regulator/converter fuel connections and housing.
Repeat leak inspection as listed above.
z Repair any fuel leaks before continuing.
Inspect Engine for Fluid
Leaks
z Start the engine and allow it to reach operating
temperatures.
z Turn the engine off.
z Inspect the entire engine for oil and/or coolant
leaks.
z Repair as necessary before continuing.
Inspect Vacuum Lines and
Fittings
z Visually inspect vacuum lines and fittings for
physical damage such as brittleness, cracks and
kinks. Repair/replace as required.
z Solvent or oil damage may cause vacuum lines
to become soft resulting in a collapsed line while
the engine is running.
z If abnormally soft lines are detected, replace as
necessary.
Inspect Electrical System
z Check for loose, dirty or damaged connectors
and wires on the harness including: Fuel lock-off,
TMAP sensor, O2 sensor, Electronic throttle,
Control Relays, Fuel Trim Valve, Acceleration
Pedal, and Distributor sensor.
z Repair and/or replace as necessary.
Check
Points
Vacuum
Lines
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