Section VI. ENGINE OVERHAUL
to the cylinder head (21); remove the
thermostat housing, thermostat, and gasket
114. Engine
(19).
a. Description and Function The engine is a six-
.
(4) Remove the 33 nuts (8) and washers (7)
cylinder, four-cycle, water-cooled, valve-in-block,
that secure the cylinder head (21) to the
pressure-lubricated gasoline engine. It is mounted in
block (28); remove the cylinder head and
the pumping unit with the cooling fan facing the side
gasket (24).
opposite the pump. The engine is secured to the frame
b. Cleaning and Inspection.
at front and rear and is enclosed by side, top, front, and
(1) Wash the cylinder head in an approved
rear panels which have access doors.
cleaning solvent; dry with clean, dry,
b. Removal.
compressed air.
(1) Remove the assembled engine, stub shaft,
(2) Carefully scrape or wire-brush all carbon
and dash (para 102).
deposits from the cylinder head, cylinder
(2) Remove the stu shaft and drive (para
b
block, valves, and the top of the pistons.
103a).
Make sure that all loose carbon is removed
(3) Remove the dash (para 104
a).
to prevent it from getting into the water
c. Installation
.
passages and engine oil.
(1) Install the dash (para 104
c).
(3) Inspect the cylinder head for cracks, breaks,
(2) Install the stub shaft and drive (para 103
e).
and warpage. Check the flatness of the
(3) Install the assembled engine, stub shaft,
cylinder head with a straight edge and feeler
and dash (para 102).
gage in three positions lengthwise and five
115. Cylinder Head
positions crosswise (fig.
The
a. Removal. (fig. 56).
maximum permissible warpage is 0.004
(1) Drain coolant from the radiator and engine.
inch
(2) Remove the spark plugs from the cylinder
head (para 71 ).
(3) Remove the two nuts (17) and lockwashers
(18) that secure the thermostat housing (16)
Figure 57. Checking cylinder head flatness.Figure 58. Cylinder head nut tightening sequence.
TAGO 6358-A
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