Spark Arrestor - MTD AC3 Professional Shop Manual

AC3 Series of engines

Spark arrestor

The spark arrestor should be checked and/or cleaned
every 25 hours of use.
NOTE: The spark arrestor also serves to keep
blockages out of the exhaust system. Typical block-
ages include insect nests built during the dormant
season.
NOTE: A spark arrestor is required by law when
trimmer are used near "unimproved" land.
To check/clean the spark arrestor:
1. To clean the spark arrestor remove the engine cover
using a T-20 driver. See Figure 2.7.
2. Remove the two screws holding the spark arrestor
cover in place with a T-25 driver. See Figure 2.8.
3. Inspect the spark arrestor. See Figure 2.9.
4. If it is blocked with carbon, remove it. It may be:
• Replaced
• Cleaned by mechanical means
• Solvent cleaned
• Burned clean using a butane or propane torch.
5. Reinstall the Spark arrestor screen By following the
previous steps in reverse order.
NOTE: Apply a thread locking compound such as
Loctite ® 266
a hex head, it is the one closest to the other
two hex head screws) and torque it to 50-55
in. lbs. (5.7-6.2 Nm). Hand tighten the short
screw.
8
TM
to the long bolt (the one with
Engine cover
Screws
Figure 2.7
Screws for
spark arrester
Figure 2.8
Spark arrestor screen
Figure 2.9