Magneto; Cleaning The Spark Plugs; Greasing The Breaker Mechanism And Checking The Points - International Harvester Company CUB Operator's Manual

ELECTRICAL SYSTEM
SPARK PLUGS AND CABLES. Continued
MAGNETO
Greasing the Breaker Mechanism and Checking the Points
(1Iust.27A
Adjusting the breake, points.
Illust.27
Spark plug wiring. Engine firing order Is 1. 3, 4. 2.
(Magneto shown on the engine.)
It is important that the breaker chamber be
kept clean, as oil on the breaker points willcause
rapid burning. Inspect the breaker
chamber after every 250 hours of operation,to
assure that it is clean. To reach the breaker
mechanism, remove the distributor cap, and
crank the engine slowly until end I'BI' of the
distributor rotor arm point~ toward the No. I
terminal on the distributor cap. and the im-
pulse coupling just trips. Take off the distrib-
utor body by removing three screws I'A'I(1IIust.28).
See that the points are in good con-
dition and have the proper clearance. If the
chamber is clean, no attention is necessary
other than checking the clearance of the points,
but if the chamber is dirty. all parts must bethoroughly
cleaned.
Cleaning the Spark Plugs
Sandblasting is the recommended method
of cleaning spark plugs. Never scrape or
clean the insulator with anything which will
scratch the porcelain. Scratched porcelain
allows carbon and dirt to accumulate muchfaster.
Always use a spark plug wrench when re-
moving or replacing plugs. This helps to
prevent cracking the porcelain.
Screw the spark plugs into the cylinder
head, using a new copper gasket with each one.
Do not tighten more than enough to compressthe
gasket to seal the plug and assure a good
heat ~ransfer between the plug and the cylin-
der head. Torque the spark plugs to 34 foot-
pounds torque. If a torque wrench is not avail-
able, tighten the plug 1/2 to 3/4 turns past
finger tight. Replace defective plugs with new
plugs.
Do not crank the engine while distributor
body is removed or it might be necessary to
retime the magneto to the engine.
Remove the breaker arm from the chamberand
clean all parts. Inspect the breaker points
and, if necessary, dress them with a sharp,fine
file. If the points are worn excessively,
replace
both points.
Fill the recess in the breaker post with IH
High Temperature Grease (21372-D) and pack
a small quantity of the same grease in back ofthe
breaker arm rubbing block (1IIusts. 27A and 28).See
your International Harvester dealer for
the proper grease to use.
See your International Harvester dealer
for various makes of replacement plugs for
normal or special service. These plugs have
been tested and recommended as best suitedfor
this engine.
If the spark plug cables are removed for
any reason, note the position of each cable
on the distributor cap as shown in Illust. 27.
Replace the breaker arm and be sure thepoints
line up when the breaker arm is in place.
27