ENGINE
L3301, L3901, L4701, WSM
1-S13
[2] LUBRICATING SYSTEM
Engine Oil Pressure
1. Remove the engine oil pressure switch, and set the oil pressure
tester (Code No.: 07916-32032). (Adaptor screw: PT 1/8)
2. Operate the engine for warming-up.
3. Measure the oil pressure at the idle speed and rated speed.
4. If the oil pressure is less than the allowable limit, do a check
below.
• Engine oil level
• Oil pump
• Oil strainer
• Oil filter cartridge
• Oil passage
• Oil clearance
• Relief valve
(When reassembling)
• After you check the oil pressure of the engine, tighten its oil
pressure switch to the specified torque.
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[3] COOLING SYSTEM
Fan Belt Tension
1. Stop the engine and remove the key.
2. Apply moderate thumb pressure to belt between pulleys.
3. If tension is incorrect, loosen the alternator mounting bolts and,
using a lever placed between the alternator and the engine
block, pull the alternator out until the deflection of the belt falls
within acceptable limits.
4. Replace fan belt if it is damaged.
Moderate Pressure:
[L3301/L3901]
• 98 N (10 kgf, 22 lbs)
[L4701]
• 68 N (7 kgf, 15.4 lbs)
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Engine oil pressure
At idle
speed
Factory
specifica-
tion
More than
98 kPa
1.0 kgf/cm
2
14 psi
Allowable
limit
50 kPa
0.5 kgf/cm
2
7 psi
At rated
speed
Factory
specifica-
tion
300 to 440 kPa
3.0 to 4.5 kgf/cm
2
43 to 64 psi
Allowable
limit
250 kPa
2.5 kgf/cm
2
36 psi
Tightening torque Oil pressure switch
15 to 19 N·m
1.5 to 2.0 kgf·m
11 to 14 lbf·ft
Deflection (A)
Factory
specifica-
tion
L3301/L3901
7 to 9 mm
0.28 to 0.35 in.
L4701
12 mm
0.48 in.
(A) Deflection
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