1-S68
ZD18(F) · ZD21(F) · ZD28(F), 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). (Adapter screw size : PT 1/8)
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.
W10373890
(2) Servicing
Clearance between Inner Rotor and Outer Rotor
1. Measure the clearance between lobes of the inner rotor and the
outer rotor with a feeler gauge.
2. If the clearance exceeds the factory specifications, replace the oil
pump rotor assembly.
W10378950
Clearance between Outer Rotor and Pump Body
1. Measure the clearance between the outer rotor and the pump
body with a feeler gauge.
2. If the clearance exceeds the factory specifications, replace the oil
pump rotor assembly.
W10381420
Engine oil pressure
Factory
spec.
At idle
speed
More than 49 kPa
0.5 kgf/cm
2
7 psi
At rated
speed
196 to 441 kPa
2.0 to 4.5 kgf/cm
2
28 to 64 psi
Allowable
limit
At rated
speed
147 kPa
1.5 kgf/cm
2
27 psi
Tightening torque Oil pressure switch
14.7 to 19.6 N·m
1.5 to 2.0 kgf·m
10.8 to 14.5 ft-lbs
Rotor lobe clearance
Factory
spec.
D722
D782
0.03 to 0.14 mm
0.0012 to 0.0055 in.
D1105
0.06 to 0.18 mm
0.0024 to 0.0071 in.
Clearance between
outer rotor and pump
body
Factory
spec.
D722
D782
0.07 to 0.15 mm
0.0028 to 0.0059 in.
D1105
0.100 to 0.180 mm
0.0039 to 0.0071 in.
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