OIL PUMP CONSTRUCTION [L8, LF]

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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
Oil discharge pressure (reference value) [Oil temperature: 100 °C {212 °F}] | 1,500 | 129— 269 {1.32—2.74, 18.7—39.0} | 180— 387 {1.84—3.95, 26.2—56.1}
3,000 | 234—521 {2.39—5.31, 33.9—75.5} | 337—591 {3.44—6.03, 49.0—85.8}

• 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 teeth of the sintered material in the oil pump sprocket have been induction hardened to improve durability.

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Oil pump chain, oil pump sprocket specification

Item | Specification (mm {in})
--- | ---
L8 | LF
Oil pump chain | Pitch size | 8 {0.3}
Oil pump sprocket | Outer diameter | 60.78 {2.392}
Driven tooth width | 6.15 {0.242}