OIL PUMP CONSTRUCTION [L8, LF, L5]

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•  The oil pump is installed inside the engine front cover. The crankshaft drives the inner rotor through the oil pump chain and oil pump sprocket.
•  The oil pump component consists of the oil pump body, oil pump sprocket, oil pump chain and oil pump chain tensioner.
•  A trochoid gear has been adopted on the oil pump.
•  The oil pump consists of the inner and outer rotors, relief valve, and oil pump body.
•  The oil pump cannot be disassembled. If there is an oil pump malfunction, replace it as a single unit.
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Oil pump specification

Item

Engine speed [rpm]

Specification (kPa {kgf/cm2, psi})

L8

LF

L5
Oil discharge pressure (reference value)
[Oil temperature: 100°C {212°F}]
1,500
129—269 {1.32—2.74, 18.8—39.0}
193—400 {1.97—4.07, 28.0—58.0}
3,000
234—521 {2.39—5.31, 34.0—75.5}
395—649 {4.03—6.61, 57.3—94.1}
Relief valve opening pressure (reference value)
500—600 {5.10—6.11, 72.6—87.0}
420—520 {4.29—5.30, 61.0—75.4}

•  A silent chain (link connecting type) has been adopted for the oil pump chain to reduce chain operation noise when the chain and the sprocket engage.
•  The engine oil in the engine front cover lubricates the oil pump chain. Wear resistance has been improved using nitriding processing of the pins constructing the oil pump chain.
•  The sintered material in the oil pump sprocket has been furnace hardened to improve durability.
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Oil pump chain, oil pump sprocket specification

Item

Specification (mm {in})

L8

LF

L5
Oil pump chain
Pitch size
8 {0.3}
Oil pump sprocket
Outer diameter
60.78 {2.393}
47.95 {1.888}
Driven tooth width
6.15 {0.242}