Chapter 1: INTRODUCTION
7
Fuel filters
Dirty fuel can clog the carburetor and introduce abra-
sive materials into the engine. To help prevent that, the
MTD engine is equipped with a fuel filter.
1. Some of the early engines were equipped with a
fuel filter placed between the fuel tank and the
carburetor. See Figure 1.7.
2. Currently the engines are equipped with a fuel
filter installed in the fuel tank where the fuel line
connects. See Figure 1.8.
Figure 1.7
Fuel Filter
Figure 1.8
Valve lash
Valve lash is the clearance between the top of the
valve stem and the rocker arm. The valve lash should
be checked after the first 25 hours of use and every
100 hours after that. Valve lash can be checked and
adjusted using the following steps:
1. If the engine has been run, allow it to cool thor-
oughly. Position the mower for easy access to
the cylinder head.
2. Disconnect the high-tension lead from the spark
plug and ground it well away from the spark plug
hole.
3. Remove the spark plug using a 13/16” or 21mm
wrench. A flexible coupling or “wobbly” exten-
sion may help. See Figure 1.9.
4. Remove the four bolts that secure the valve
cover using a 10mm wrench, and remove the
valve cover from the engine.
NOTE: If care is used, not to damage the valve
cover gasket, it can be re-used.
5. Secure the safety bale with a spring clamp (if
installed on a mower), and slowly pull the starter
rope until air can be heard being expelled from
the spark plug hole.
Figure 1.9
Spark plug hole
High tension lead
Muffler
(plug removed)
Valve cover
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