c. Installation.
(3) Inspect all threaded surfaces for burs or
damage.
Replace any damaged
(1) Install the manifold (12, fig. 7) and
hardware.
gaskets on the engine block.
(4) Brush all dirt and dust from between the
(2) Install the muffler (1) and gaskets on the
cooling fins. Scrape off all carbon and
manifold, and secure with the two cap
corrosion deposits on the head and block.
screws (13) and two nuts (15).
(5) Replace the cylinder head gaskets.
c. Installation.
(4) Connect the fuel lines to the fuel pump
(1) Install the head gaskets and heads (6, fig.
17) on the engine block.
(5) Connect the governor linkage (par. 112).
(2) Install the 14 nuts (5, fig. 23) and
(6) Install the carburetor (par. 110).
lockwashers which secure the cylinder
(7) Check manifold, muffler, and connections
heads to the engine block.
for leaks.
(3) Install the spark plugs (1, fig. 17) and
ignition cables (3) in the cylinder heads.
124. Valve Adjustment
(4) Install the cylinder air shrouds (5) on the
a. Removal.
cylinder heads, secure with the four
(1) Remove the carburetor (par. 10).
screws (3, 4, fig. 23) and lockwashers.
(2)
Disconnect the governor linkage (par.
123. Manifold and Muffler
(3) Disconnect fuel lines from fuel pump (par.
a. Removal.
(1) Remove the carburetor (par. 110).
(4) Remove the muffler and manifold (par.
(2) Disconnect governor linkage (par. 112).
(3) Disconnect fuel lines from fuel pump (par.
(5) Remove the valve cover (11, fig. 21), by
removing the two cap nuts (12) which
(4) Remove muffler (1, fig. 7) by removing
secure the covers to the block.
two cap screws (13) and two nuts (15)
(6) Remove the valve cover gaskets.
which secure the muffler to the manifold
b. Adjustment.
(12), and the manifold to the engine block.
(1) Hand crank the engine slowly to the point
(5) Disconnect the exhaust tube from the
1/4 revolution past the point at which the
muffler.
intake valve of the left-hand cylinder has
(6) Remove the muffler from the manifold.
opened and closed. This will be the point
(7) Remove the manifold and gaskets from
at which the TC mark on the blower wheel
the engine block.
(1, fig. 31) and the TC mark on the
gearcase (14. fig. 27) are in line.
b. Cleaning, Inspection, and Repair.
(2) Adjust the intake valve for a clearance of
(1) Clean all parts with an approved cleaning
0.006 to 0.008 inch between the end of
solvent.
the valve stem (4, fig. 28) and the tappet
(2) Inspect the muffler for dents, cracks, or
(6), and adjust the exhaust valve for a
other deficiencies.
Replace a faulty
clearance of 0.006 to 0.008) inch between
muffler.
the valve stem and tappet. Use a feeler
(3) Inspect the manifold for cracks or
gage for valve adjustment. Make the
deficiencies which may cause improper
adjustment in each case by
operation. Replace damaged manifold,
and replace all gaskets.
66