1. See
SECTION 4 - REMOVE EXTERNAL ASSEMBLIES.
2. See Figure 41. Remove two hex flange screws (A) to
release heat shield (B) from crankcase and cylinder
head.
NOTE: A third hex flange screw to the engine base is
removed with the blower housing.
3. Thoroughly clean exterior surfaces of engine prior to
disassembly. Proceed as follows:
NOTE: Dirt caked on cooling fins and other areas can
fall into cylinder bore or stick to subassemblies as parts
are removed. Abrasive particles can damage machined
surfaces and plug oil passageways.
A. Remove all loose debris by hand.
B. Remove dust and dirt with a soft bristle brush and
a portable hand held vacuum.
C. Gently scrape away stubborn accumulations of dirt
and other deposits using a plastic putty knife or stiff
bristle brush.
D. Apply a light solvent to bristle brush to loosen and
remove grit and oily residue, if necessary.
4. Thoroughly clean area around spark plug to keep dirt
and debris out of combustion chamber.
5. Remove spark plug (C) from cylinder head using the
5/8 inch Spark Plug Wrench (Part No. 19576S).
6. Remove four hex flange screws (D) to release valve
cover (E) from cylinder head.
7. Remove and discard valve cover gasket (F).
8. Move piston 1/4 inch (6 mm) past Top Dead Center
(TDC) of the compression stroke. Proceed as follows:
NOTE: Disassembly with the valve train loaded can
result in bent push rods.
A. While rotating flywheel end of crankshaft by hand
in the direction of engine rotation, watch the rocker
arms to determine the action of the valves. After
the exhaust valve closes, the intake valve begins
to open.
B. When the intake valve closes (so that both valves
are closed with the rocker arms loose), insert a
wooden dowel through the spark plug hole until
seated at the top of the piston.
C. Rotate engine in the same direction until the piston
pushes the wooden dowel to its highest point. This
is TDC of the compression stroke.
D. Place a mark on the wooden dowel that is even
with the machined surface at the top of the spark
plug hole. Make a second mark 1/4 inch (6 mm)
above the first.
E. Rotate engine in the same direction until the second
mark on the wooden dowel is even with the
machined surface at the top of the spark plug hole.
Remove wooden dowel.
9. Remove locknuts (G), rocker balls (H), and rocker arms
(I) from rocker arm studs (J).
10. Remove the intake and exhaust push rods (K).
11. Remove rocker arm studs and push rod guide plate (L).
12. Remove cylinder head screws (M) from cylinder head
(N).
13. Remove cylinder head from two locating pins (O) in
downside of cylinder deck (P).
14. Remove and discard the cylinder head gasket (Q).
15. Remove locating pins from cylinder deck and set aside.
16. See
SECTION 6 - SERVICE ENGINE
SUBASSEMBLIES, CYLINDER HEAD.
39
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