To Replace Spark Plug; Cleaning The Air Filter - Craftsman BRUSHWACKER 316.74520 Operator's Manual

Cleaning the Air Filter
1. Remove air filter/muffler cover. See Removing the
Air filter/Muffler Cover in the Maintenance section.
2. Remove the air filter from behind the air filter/muffler
cover (Fig. 24).
3. Wash the filter in detergent and water (Fig. 25). Rinse
the filter thoroughly. Squeeze out excess water.
Allow it to dry Completely.
4. Apply enough clean SAE 30 oil to lightly Coat the
filter (Fig. 26).
5. Squeeze the filter to spread and remove excess oil
(Fig. 27),
6. Replace the air filter in the air filter/muffler cover (Fig. 24).
NOTE: Operating the unit without the air filter and air
filter/muffler cover assembly wi!! VOID the warranty.
Reinstalling the Air filter/Muff!er Cover
1. Place the air filter/muffler cover over the back of the
carburetor and muffler.
NOTE: The choke lever must be in the PARTIAL choke
position (B) (Eig. 23) to install the air filter!muffler cover.
2. Insert the four (4) screws into the holes in the air
filter/muffler cover (Fig. 23) and tighten. Do not over
TO REPLACE SPARK PLUG
Use a Champion RDJ7Y spark plug (or equivalent). Correct
air gap is 0.020 in. (0.50 ram). Remove plug after every 25
hours of operation and check its condition (Fig_28).
1. Stop the engine and pull the spark plug wire off of
the spark plug.
2. Clean around the spark plug and remove it from the
cylinder head.
NOTE: Replace a cracked, fouled, or dirty spark plug. Do
not sand blast, scrape, or clean electrodes because the
engine could be damaged by grit entering the cylinder.
3. Set the air gap at 0.020 in. (0.50 mm) using a wire
feeler gauge (Fig. 28). Install a correctly gapped
spark plug into the cylinder head. Torque to
110.120 in.lb (12.3-1&5 N-m).
4. Replace the spark plug wire.
=
0.020 inch
(0.50 mm)
f
J
f /
Fig, 25
J
Fig, 26
/
/
/
Fig. 27
A
Fig. 28
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