Servicing Engine Belts; Replacing Spark Plugs; Changing Coolant In Cooling System - Toro Groundsmaster 345 Operator's Manual

SERVICING ENGINE BELTS

Check tension of all belts initially after the first day of
operation and every 100 hours thereafter.
Alternator Belt
A new alternator belt (Fig. 34) is to be tensioned to 65
lbs. A used belt is to be tensioned to 40 lbs.
Figure 34
1. Alternator
2. Brace
1. To adjust belt tension, loosen bolt securing brace to
engine, bolt securing alternator to brace and alternator
mounting bolt (Fig. 34).
2. Insert pry bar between alternator and engine and
pry out on alternator (Fig. 34).
3. Hold alternator in position after proper belt tension
setting is achieved and tighten alternator and brace
bolts to secure adjustment.
Cooling Fan Belt
A new cooling fan belt (Fig. 34) is to be tensioned to 65
lbs. A used belt is to be tensioned to 40 lbs.
2
Figure 35
1. Idler arm
2. Engine mount
ENGINE MAINTENANCE
2
1
1
1. To adjust belt tension, loosen upper and lower nuts
securing idler arm to front engine mount (Fig. 35).
2. Pull out on idler arm until desired belt tension is
achieved.
3. Tighten mounting nuts to secure adjustment.

REPLACING SPARK PLUGS

Change spark plugs after every 400 operating hours to
assure proper engine performance and reduce exhaust
emission level.
Correct spark plug to use is a Motorcraft–AGSF22C or
AGRF22 or equivalent.
Recommended air gap is .040" (1.016 mm).
Note: The spark plug usually lasts a long time; however,
the plug should be removed and checked whenever the
engine malfunctions.
1. Clean area around spark plugs so foreign matter
cannot fall into cylinder when spark plug is removed.
2. Pull spark plug wires off spark plugs and remove
plugs from cylinder head.
3. Check condition of side electrode, center electrode,
and center electrode insulator to assure there is no
damage.
IMPORTANT: A cracked, fouled, dirty or otherwise
malfunctioning spark plug must be replaced. Do
not sand blast, scrape, or clean electrodes by using
a wire brush because grit may eventually release
from the plug and fall into the cylinder. The result is
usually a damaged engine.
4. Set air gap between center and side of electrodes at
.040" (1.016 mm). Install correctly gapped spark plug
and tighten plug to 11–15 ft–lb. If torque wrench is not
used, tighten plug firmly.
5. Install spark plug wires.
CHANGING COOLANT IN COOLING
SYSTEM
The cooling system must be filled with a 50/50 solution
of water and permanent ethylene glycol anti–freeze.
Every two years, drain the coolant from the radiator and
engine by opening the drain cock and block plug. After
coolant is drained, flush the entire system and refill it
with a 50/50 solution of water and anti–freeze. Capacity
of cooling system is approximately 6 quarts (5.7 L).
When filling the radiator, level of coolant must be above
the core and 1 inch (25 mm) below bottom of filler neck.
DO NOT OVERFILL. Always install radiator cap
securely.
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