MTD Engine - Series 350/450/650
33
11.13. Vigorous pumping with a hand pump vacuum /
pressure tester will result in a slight build-up of
pressure within the chamber. See Figure 11.13.
• This 2-3 PSI (.14-.20 Bar) build-up will dissipate
through the drain-back port over the course of 5-
10 seconds.
• No vacuum should accumulate in the chamber
unless the drain-back port is blocked and the
disc is not moving from over the crankcase port.
Figure 11.13
12. CYLINDER HEAD REMOVAL
12.1. It is recommended that the mower be positioned
on the bench vertically for cylinder head
removal. See Figure 12.1.
NOTE: This position provide easy access to
most service points, yet prevents undue oil spill-
age.
NOTE: It is not absolutely essential to remove
the fan shroud, but taking the engine cover off
will ease access to some components.
12.2. Disconnect and ground the spark plug high ten-
sion lead, and remove the spark plug using a 13/
16” or 21mm wrench. See Figure 12.2.
Figure 12.1
Figure 12.2
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