CYLINDER HEAD
63
14. Lift the cylinder head off of the engine.
15. Carefully clean all sealing surfaces of all gasket
residue. Do not scratch the sealing surfaces.
See Figure 9.7.
NOTE: Make a visual inspection of the valves
and cylinder bore to confirm the initial diagnosis.
Figure 9.7
Clean gasket
surface
Oil supply
Push rod chamber and oil return
Alignment
dowels
passage
Cylinder head installation
1. Place a new head gasket on the cylinder, allow-
ing the alignment dowels to hold it in place.
See Figure 9.8.
NOTE: MTD uses graphite head gaskets that
have a bead of silicon on them. They are not
reusable.
2. Position the cylinder head on the engine block.
3. Install the 4 head bolts, and tighten them to a
step torque of 38 - 41 ft-lb. (52 - 55 Nm) in an
alternating diagonal pattern.
See Figure 9.9.
NOTE: The bolt closest to the exhaust valve
must be the last bolt tightened. Failure to do so
will result in the head bolt loosening up.
NOTE: The 490 engine has an over sized bolt
with a Belleville washer in the number 4 position.
Figure 9.8
Graphite head
gasket
Figure 9.9
3
Exhaust
port
1
2
3
4
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