Cylinder head installation – Cub Cadet MTD 90 Series User Manual
Page 106
78/83/90 Series Horizontal Shaft Engines
100
Cylinder head installation
1.
Place a new head gasket on the cylinder, allowing
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 reus-
able.
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.
4.
Insert the push rods.
5.
Install the rocker arms.
6.
Adjust the valve lash by following the steps
described in Chapter 1: Introduction.
7.
Install the throttle lever and the heat baffle.
8.
Install the muffler by following the steps described in Chapter 8: Exhaust.
9.
Install the carburetor and engine shroud, using new gaskets, by following the steps described in Chapter 3: Air
Intake
10.
Test run the equipment in a safe area before returning it to service. Check all safety features.
Figure 9.8
Graphite head
gasket
Figure 9.9
3
Exhaust
port
1
2
3
4