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ENGINE DIVISION SERVICE MANUAL
TM 5-4210-230-14&P-1
d.
Reinstall cap onto distributor.
e.
Inspect high tension ignition cables for cracks or
deterioration and replace defective cables.
4. Replace all Spark Plugs, Check Required Voltage and
Replace any Defective Plugs.
a.
Remove used spark plugs.
b.
Check gap of new spark plugs (see Emission Control
System Tune-Up Specifications) and adjust gap, if
necessary.
Continuous light load operation may produce spark
plug fouling, necessitating more frequent spark plug changes
than are indicated in the Maintenance Intervals. A change in
plug heat range will not correct fouling under these conditions.
To change spark plug gap, bend the outer electrode;
never bend the center electrode. Be accurate use a round
wire gauge to check the electrode gap. Check the gap of new
spark plugs before installation and tighten to specified torque.
Fig. 5
IH Branches and Dealers are equipped with spark
plug
cleaning
and
testing
equipment
which
renders
dependable service.
c.
Install new spark plugs and torque to specifications
(see
Emission
Control
System
Tune-Up
Specifications.
d.
Install high tension spark plug cables onto spark plug
terminal.
IMPORTANT
When replacing high tension spark plug cables, be sure
cables are routed to proper spark plugs (refer to firing
order cast into intake manifold).
e.
Connect Tune-Up Scope Tester No. SE-2440, or
equivalent.
f.
Start and operate engine until normal operating
temperatures are reached. Then operate engine at
1000 RPM.
g.
Observe required voltage (see Emission Control
System Tune-Up Specifications).
h.
If required voltage is out of specifications on any
cylinder, replace spark plug and repeat Steps a
through g.
5. Replace Fuel Filter.
Inline fuel filters are used on most IH engines (Fig.
6). This type of filter is inexpensive and easy to replace when
needed.
Fig. 6 Inline Fuel Filter Typical on Most Gasoline Engines
6. Clean or Replace Air Cleaner Filter.
a.
Dry Type - Remove air cleaner element, clean any
accumulation of dirt from air cleaner housing. Tap
element lightly on a flat surface or use low air
pressure to remove dirt particles. Blow air from
inside filter element
CGES-215 Page 8
PRINTED IN UNITED STATES OF AMERICA
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