MTD Engine - Series 350/450/650
34
12.3. Remove the four screws securing the valve
cover using a 10mm wrench. See Figure 12.3.
12.4. Loosen the jam nuts and fulcrum nuts that
secure the rocker arms using a 10mm wrench
and a 14mm wrench.
12.5. Pivot the rocker arms aside, or remove them
completely, and remove the push rods.
NOTE: Once broken-in, the rocker arm should
be kept with its corresponding valve.
NOTE: The intake and exhaust push rods are
identical and interchangeable. It is preferable,
but not absolutely necessary to return the same
push rods to their original locations on engine
with substantial (>
100 hours) operating time.
12.6. Remove the muffler, as described in the
EXHAUST section of this manual.
See Figure 12.6.
12.7. Double-nut and remove the exhaust studs, simi-
lar to the method used to remove the carburetor
studs in the FUEL SYSTEM section of this man-
ual.
12.8. Remove the carburetor as described in the
FUEL SYSTEM section of this manual.
See Figure 12.8.
12.9. Remove the cylinder head bolts using a 14mm
wrench. See Figure 12.9.
12.10.Lift the cylinder head off of the mower.
NOTE: The alignment dowels fit in two of the
head bolt holes.
12.11. Carefully clean all sealing surfaces of all gasket
residue. Do not scratch the sealing surfaces.
12.12.Make a visual inspection of the valves and cylin-
der bore to confirm the initial diagnosis.
Figure 12.3
Figure 12.6
Figure 12.8
Figure 12.9
Cylinder head
bolts
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