1-S61
L3130 · L3430 · L3830 · L4630 · L5030, WSM
ENGINE
[3] LUBRICATING SYSTEM
(1) Checking
Engine Oil Pressure
1. Remove the engine oil pressure switch, and set a oil pressure
tester (Code No.: 07916-32032).
2. Start the engine. After warming up, measure the oil pressure of
both idling and rated speeds.
3. If the oil pressure is less than the allowable limit, check the
following.
• Engine oil insufficient.
• Oil pump defective
• Oil strainer clogged
• Oil filter cartridge clogged
• Oil gallery clogged
• Excessive oil clearance
• Foreign matter in the relief valve
(When reassembling)
• After checking the engine oil pressure, tighten the engine oil
pressure switch to the specified torque.
W1034952
(2) Servicing
Rotor Lobe Clearance
1. Measure the clearance between lobes of the inner rotor and the
outer rotor with a feeler gauge.
2. Measure the clearance between the outer rotor and the pump
body with a feeler gauge.
3. If the clearance exceeds the factory specifications, replace the oil
pump rotor assembly.
W1035296
Engine oil pressure
At idle
speed
Allowable
limit
More than 49 kPa
0.5 kgf/cm
2
7 psi
At rated
speed
Factory
spec.
294.2 to 441 kPa
3.0 to 4.5 kgf/cm
2
42.7 to 64 psi
Allowable
limit
245 kPa
2.5 kgf/cm
2
36 psi
Clearance between
inner rotor and outer
rotor
Factory spec.
0.03 to 0.14 mm
0.0012 to 0.0055 in.
Clearance between
outer rotor and pump
body
Factory spec.
0.11 to 0.19 mm
0.0043 to 0.0075 in.
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