Nanni N4.40, Workshop Manual

Page: 95 / 175

ENGINE
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
1-S25
(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 examine the oil pressure of the engine, tighten its oil
pressure switch to the specified torque.
M00000003ENS0019US1
(3) Cooling System
Fan Belt Tension
1. Push the belt halfway between the fan drive pulley and
alternator pulley at a specified force 98 N (10 kgf, 22 lbf) to
measure the deflection
(A) .
2. If the measurement is out of the factory specifications, loosen
the alternator mounting screws and adjust its position.
M00000003GEG0016US1
Engine oil pressure
At idle
speed
Factory
spec.
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
spec.
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 spec.
7.0 to 9.0 mm
0.28 to 0.35 in.
(A) Deflection
KiSC issued 06, 2009 A