Toro 74237 - Fuel System Maintenance; Replacing the Fuel Filter

tool/feeler g aug e to c hec k and adjust the air g ap .
Install a new spark plug(s) if necessar y .
• T ype: NGK
®
BPR4ES or equi v alent
• Air Gap: 0.030 inc h (0.75 mm)
Removing the Spark Plug
1. Diseng ag e the PTO , mo v e the motion control
lev ers to the neutral loc k ed position and set
the parking brak e .
2. Stop the engine , remo v e the k ey , and w ait for
all mo ving par ts to stop before lea ving the
operating position.
3. Pull the wire(s) off the spark plug(s) ( Figure 33 ).
No w clean around the spark plug(s) to prev ent
dir t from falling into the engine and potentially
causing damag e .
4. R emo v e the spark plug(s) and metal w asher .
Figure 33
1. Spark plug wire 2. Spark plug
Checking the Spark Plug
1. Look at the center of the spark plug(s)
( Figure 34 ). If y ou see light bro wn or g ra y on
the insulator , the engine is operating properly .
A blac k coating on the insulator usually means
the air cleaner is dir ty .
Important: Nev er clean the spar k
plug(s). Al w ays r eplace the spar k plug(s)
when it has: a black coating , w or n
electr odes, an oil y film, or cracks.
Figure 34
1. Canter electrode insulator
3. Air gap (not to scale)
2. Side electrode
2. Chec k the g ap betw een the center and side
electrodes ( Figure 34 ). Bend the side electrode
( Figure 34 ) if the g ap is not cor rect.
Installing the Spark Plug
1. Install the spark plug(s). Mak e sure the air g ap
is set cor rectly .
2. Tighten the spark plug(s) to 16 ft.-lb (22 N ⋅ m).
3. Push the wire(s) onto the spark plug(s)
( Figure 33 ).
Fuel System
Maintenance
Replacing the Fuel Filter
R e place the fuel filter after ev er y 200 operating
hours or yearly , whic hev er occurs first.
Nev er install a dir ty filter if it is remo v ed from the
fuel line .
1. Diseng ag e the PTO , mo v e the motion control
lev ers to the neutral loc k ed position and set
the parking brak e .
2. Stop the engine , remo v e the k ey , and w ait for
all mo ving par ts to stop before lea ving the
operating position.
3. Allo w the engine to cool do wn.
4. Close the fuel shut-off v alv e ( Figure 35 ).
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