Chapter 1: INTRODUCTION
6
2. The second method for draining the mower
engine oil is to tip the mower on its side, dipstick
tube down and dipstick removed, draining the oil
into a waste oil pan.
2a. Disconnect the spark plug lead and ground
it to the engine block.
2b. Lean the mower to the muffler side of the
engine. See Figure 1.6.
Fuel
Gasolines currently on the market are not pure gas.
Today’s fuels have alcohol and other additives in them
to reduce emissions. The fuel make up can vary sea-
sonally and geographically.
Fuel with alcohol added to it is sometimes referred to
as “oxygenated fuel”. The extra oxygen carried by the
ethanol increases the oxidation of the fuel. This speeds
up the process that causes the fuel to go bad.
Excessive alcohol in fuel creates a lot of problems for
gasoline engines. One of the biggest problems is that
alcohol attracts and holds water. This corrodes the
metal components of the fuel system, especially the
carburetor. Alcohol also does not produce as much
heat as gasoline when burnt. This results in less power
for the engine.
A 10% alcohol mix (E10) is acceptable for MTD
engines. Anything higher than that will result in perfor-
mance and starting issues.
NOTE: E85 and E20 fuels are not to be used in
any MTD engines.
• Use clean, fresh fuel with a pump octane rating
of 87 or greater.
• Stale or out-of-date fuel is the leading cause of
hard starting issues.
• Use of a high octane fuel may improve perfor-
mance in areas using high alcohol fuel blends.
Figure 1.6
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