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OIL PUMP CONSTRUCTION [L8, LF, L3]

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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, oil pump chain guide, and oil pump chain tensioner.
• An efficient and compact five-lobe epitrochoid and six-flank inner envelope type 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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1 | Oil pump body (relief valve inside)
2 | Oil pump chain tensioner
3 | Oil pump chain guide
4 | Oil pump chain
5 | Oil pump sprocket
6 | Front
7 | Inner rotor
8 | Outer rotor
9 | Oil in
10 | Relief valve component
11 | Rear
12 | Oil out

Oil pump specification

Item | Engine speed [rpm] | Specification [kPa {kgf/cm2, psi}]
--- | --- | ---
L8 | LF | L3
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}
Relief valve opening pressure (reference value) | 450-550 {4.59-5.61, 65.3-79.8} | 420-520 {4.28-5.30, 60.9-75.4}

• A silent chain (link connecting type) has been adopted to 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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1 | Timing chain
2 | Oil pump driven chain
3 | Pitch size
4 | Pin
5 | Link
6 | Oil pump sprocket
7 | Outer diameter
8 | Driven tooth width

Oil pump driven chain, oil pump sprocket specification

Item | Specification
--- | ---
L8 | LF | L3
Oil pump driven chain | Pitch size | (mm {in}) | 8 {0.3} | 6.35 {0.25}
Oil pump sprocket | Outer diameter | (mm {in}) | 60.78 {2.392} | 46.46 {1.829}
Driven tooth width | (mm {in}) | 6.15 {0.242} | 5.7 {0.23}