Engine--General Service - Gravely Convertible 10 Shop Manual

2. Remove thru bolts.
3. Remove end bracket capscrew from end cap, then turn bracket so that it will not interfere with
removal of mounting bracket.
4. Slip mounting bracket and frame off over drive end of armature.
5. Separate end cap from armature - NOTE - Brush springs will probably fall out when brushes pull
free of the commutator.
6. Clean up commutator with a coarse, lint-free cloth - if badly worn or grooved, turn down on lathe.
7. Replace brushes as follows: The input brushes are part of the terminal stud assembly. To replace,
remove nuts, and pull stud out thru inside of end cap. Insert new stud terminal-brush unit after
transferring insulation bushing from old unit. To replace, remove nuts, and pull stud out thru inside
of end cap Insert new stud terminal-brush unit after transferring insulation bushing from old unit.
To replace insulated brushes, simply remove capscrew and lockwasher. Always use new brushes
and springs. Assemble brushes with chamfered side away from springs. Keep brush leads away
from contact with metal of end cap.
8. To keep brushes in position so that they will fit over the commutator as the end cap is reinstalled,
wrap rubber bands over brushes and end cap - qut and remove the rubber bands after brushes are
started on the commutator.
9. Reverse procedure to reassemble reconditioned starter - make sure bolts, etc., are tightened to the
torque valves specified on the accompanying illustration. Apply a light film of of to the shaft
where it contacts the bearings - do not lubricate spline on armature shaft.
COOLING:
Air is drawn into the cooling shroud by fins provided on the flywheel. The rotating air screen and the
cooling fins on the block and cylinder head must be kept clean and unobstructed at all times. Never
operate engine with blower housing or cooling shrouds removed. These direct air flow past cooling
fins. Removal results in improper air circulation.
EXTERNAL SURFACES
External surfaces must be maintained in clean condition free of any oil and dirt accumulation. This is
done not only for safety and appearance but because poor cooling efficiency results from dirty external
surfaces.
ENGINE STORAGE
If engine is to be out of service for a considerable length of time, the following steps are
recommended:
a.
Drain oil from crankcase while engine is still hot and flush with clean, light oil. Refill crankcase.
b.
Drain fuel tank and carburetor.
c.
Clean exterior of engine.
d.
Spread a light film of oil over any exposed surfaces of engine subject to corrosion.
e. Pour tablespoon of oil into spark plug hole, crank engine slowly by hand and replace spark plug.
f.
Store in dry place.
ENGINE TESTS
Crankcase Vacuum Test: A partial vacuum should be present in the crankcase when engine is operating
at normal temperatures. An engine in good condition will have crankcase vacuum of 5 to 10" water
column as
read on "U" tube water manometer or 1/2 to 1" Hg. as calibrated on mercury vacuum gauge. Crankcase
vacuum check is best accomplished with the "U" tube manometer. If vacuum is not in the specified range,
this could be attributed to one or more of the following factors -- the condition easiest to remedy should be
checked first:
A. Clogged Crankcase Breather can cause positive pressures to build up in the crankcase. Disassemble
breather assembly, thoroughly clean, then recheck pressure after re-installing.
ENGINE – GENERAL SERVICE
(all models)
30