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MAINTENANCE
A battery three-fourths charged is in no danger of
damage from freezing. Therefore keep the battery
better than three-fourths charged, especially during
winter weather.
If your tractor is not to be operated for some time
during the winter months, it is advisable to remove
the battery and store it in a cool dry place above
freezing {+32° F.). Place the battery on a rack
or bench.
Check the battery at least once a month for water
level and specific gravity. If the battery shows need
of charging it should be given immediate attention.
Keeping the battery fully charged not only adds to
its life but makes it available for instant use when
needed.
When replacing a battery, make certain that the
ground cable is connected to the positive ( +)
terminal on the battery.
Before working on any part of the electrical system,
disconnect the battery ground cable. See I/lust. 37.
Do nqt reconnect this cable until all electrical work
has been completed. · This
will
prevent shorting
and causing damage to any of the electrical units.
Valve Clearance Adjustment'
Check the valve clearance after· every 400 hours
of operl!tion and adjust the clearance if necessary.
A clearance of .013 inch, measured when the valves
are cios.ed and the engine is cold, is necessary be-
tween the end of the valve levers and the valve stems.
1.
To safeguard against accidentally starting the
engine when checking the valve clearance, remove
cable "B" from the coil cover on the magneto (see
I/lust. 32A), or remove distributor to coil cable "A"
from the socket on the coil of the battery ignition
unit. See I/lust. 33B.
2. Remove the valve cover from the left side of
the crankcase.
3. Remove the spark plug from the No. 1 cylinder
(the cylipder next to the radiator).
4. Place your th~b over the spark plug opening
and slowly crank the engine until an outward pres-
sure is felt.
(Pressure indicate~ that the No. 1
piston is moving toward the uppefi~ead center of the
compression stroke.) Continue cranking slowly
until the notch on the fan drive pulley (on the
crankshaft) is in line with the timing pointer in the
front crankcase cover. See Illust. 33. Both valves
are now closed on the compression stroke of the
No. 1 cylinder.
5. Use two thin wrenches when adjusting the
valve clearance. See I /lust. 46. Use the lower
wrench to hold the tappet and the upper wrench to
raise or lower the tappet adjusting screw. A gauge
of
.o
13-in. thickness should slip snugly between the
valve stem and the tappet adjusting screw.
6. Crank the engine one-half revolution at a
time and check the clearance of each cylinder's
46
lllust. 46
Adjusting and checking valve clearance.
valves and adjust if necessary. Do this on each set
of cylinder valves in succession according· to the
firing order of the engine, which is 1, 3, 4, 2.
'
7. Replace the valve cover. Check to see that the
valve cover gasket makes an oiltight seal with the
crankcase. Replace the gasket if necessary.
8. Replace magneto cable "B" (Illust. 32A) or
distributor to coil cable "A" (Illust. 33B) into the
socket from:which it was removed.
Important!
Be accurate-use a feeler gauge for
checking the valve clearance.
Minor Engine Service Oper~tions
Cylinder Head Gasket
For most satisfactory results in tightening the
cylinder head after installing a cylinder head gasket,
tighten down all nuts fairly snug, starting with the
row in the center, then going to the others. Re-
tighten in the same order, giving each nut a small
part of a turn at a time. Continue this until all nuts
are tight. Do not screw one nut down perfectly
tight and then go to the next, as you will not obtain
an even pressure on the gasket in this manner.
After replacing the cylinder .tillad, it is necessary
to insure against leaks by retighteoing the stud nu~
after engine has been operating and the water jacket
has become thoroughly heated.
Crankshaft Bearings, Pistons and Rings
We cannot impress too strongly the necessity of
having your International Harvester dealer do the
work on replacement of connecting-rod bearings, ·
crankshaft bearings, pistons and rings, and grinding
valves.
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