33
IMPORTANT! Check fuel lines and connections
every 400 hours. Inspect for deterioration,
damage, or loose connections.
FUEL FILTERS (Fig. 29)
The MULTI PRO
®
5500 is equipped with two fuel
filters. One is an in-line type located between the
fuel tank and fuel pump. The other is a threaded
filter located between the fuel pump and
carburetor. Replace filters every 400 hours of use.
In-line:
1. Remove the inlet and outlet hose clamps.
2. Disconnect the hoses and discard the filter.
3. Install new filter by connecting the hose from
the fuel tank to the inlet side and the hose from
the fuel pump to the outlet side.
4. Position the hose clamps and tighten.
Threaded:
1. Loosen and slide hose clamp down the fuel
line. Remove the line from the filter.
2. Use 15/16" wrench to remove filter from elbow
and discard old filter.
3. Thread new filter and tighten securely. DO
NOT OVERTIGHTEN.
4. Install fuel line to new filter and secure with
hose clamp.
Note: After replacing fuel filters start the engine
and check for leaks.
WARNING
Servicing the vehicle while the engine is
running or vehicle is not properly secured,
could result in personal injury or death.
Before servicing or making adjustments
to the vehicle, set parking brake, stop
engine, and remove key from the switch.
Figure 30
SPARK PLUGS (Fig. 30)
1. Spark Plugs
For specifications refer to the Ford Engine
Maintenance and Operator's Manual. (Supplied
with vehicle)
Replace spark plugs at recommended intervals.
Maintenance of spark plugs is an important factor
in assuring proper engine performance and
reducing the exhaust emission level.
The MULTI PRO
®
5500 uses Motorcraft-AGSF 22C
or AGRF22 or equivalent Spark Plugs with air gap
set as specified.
1. Remove wires from each Spark Plug by
grasping, twisting, and then pulling the molded
boot of the wire only. Do not pull directly on the
wire because the wire connection inside the boot
may become separated.
2. After loosening each Spark Plug one or two
turns, clean the area around each Spark Plug port
with compressed air, then remove Spark Plugs.
3. Check condition of side electrode, center
electrode, and center electrode insulator. Replace
spark plugs if damage is evident.
IMPORTANT! A CRACKED, FOULED, DIRTY,
OR OTHERWISE MALFUNCTIONING SPARK
PLUG MUST BE REPLACED. DO NOT
ATTEMPT TO SAND BLAST, SCRAPE, OR
CLEAN ELECTRODES WITH A WIRE BRUSH
BECAUSE GRIT MAY EVENTUALLY RELEASE
FROM THE PLUG AND CAUSE ENGINE
DAMAGE.
4. Set gap between center and side electrodes
as specified. Install correctly gapped Spark Plug
and torque (tighten) plug as specified.
5. Connect Spark Plug wires securely.
NOTE: Do not overtighten plugs. The gap may
change considerably due to the distortion of
the plug outer shell.
1. Inline filter 2. Threaded filter
Figure 29
ENGINE MAINTENANCE
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