Spark Plug Service; Keeping Engine Clean; Grassbag; Rear Defl Ector - Hayter 379A Owner's Handbook Manual

MOWER MAINTENANCE

Spark Plug Service

For good performance, the spark plug must be properly gapped
and free of deposits.
1. Disconnect the cap (A) from the spark plug (B), and remove
any dirt from the spark plug area.
2. Use the proper size spark plug wrench to remove the spark
plug.
3. Inspect the spark plug. Replace it if damaged, badly fouled,
if the sealing washer is in poor condition, or if the electrode
is worn.
4. Measure the electrode gap with a suitable gauge. The correct
gap is 0.028-0.030" (0.7-0.8 mm). If adjustment is needed,
correct the gap by carefully bending the side electrode.
5. Install the spark plug carefully, by hand, to avoid cross
threading.
6. After the spark plug is seated, tighten with the proper size
spark plug wrench to compress the washer.
When installing a new spark plug, tighten 1/2 turn after the spark
plug seats to compress the washer.
When reinstalling the original spark plug, tighten 1/8-1/4 turn
after the spark plug seats to compress the washer.
Fig. 22 Fig. 23
B
A
Properly tighten the spark plug. A loose spark plug can
become very hot and can damage the engine. Over tightening
the spark plug can damage the threads in the cylinder head.
7. Attach the spark plug cap to the spark plug.
(Refer to fi g.22)

Keeping Engine Clean

Remove all grass and debris from the engine including the
exhaust/exhaust guard, the air ways in the top cowl and the
surrounding deck areas after every use.
Never spray the engine with water during cleaning. Water can
contaminate the fuel. Always clean with a brush or air.
(Refer to fi g.23)
Grass and debris may clog the engines air cooling system
especially after prolonged operation whilst cutting tall, dry grass.
The internal cooling fi ns and surfaces may require cleaning to
prevent overheating and engine damage. We recommend that
this service be carried out by an authorised Hayter Service
Dealer.

Grassbag

WARNING: Improper maintenance, use of non conforming
replacement components, or the removal or modifi cation of
the grassbag may cause death or serious injury.
Fig. 24
14
Remove grass debris from the grassbag immediately after use
and check its condition for signs of damage.
To prevent accidents replace a damaged grassbag
immediately.
(Refer fi g.24)
Rear Defl ector
WARNING: Improper maintenance, use of non conforming
replacement components, or the removal or modifi cation of
the rear defl ector may cause death or serious injury.
Remove grass debris from the rear defl ector immediately after
use and check its condition for signs of damage.