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OIL PUMP COMPONENT CONSTRUCTION [L3]

BME011114100T01
• A chain driven type oil pump has been adopted whereby the crankshaft drives the inner rotor through the oil pump chain and oil pump sprocket.
• The oil pump component consists of the oil pump sprocket, oil pump chain, oil pump chain guide, oil pump chain tensioner, and oil pump chain tensioner spring.

1 | Oil pump body (relief valve inside)
2 | Oil pump chain tensioner spring
3 | Oil pump chain tensioner
4 | Oil pump chain guide
5 | Oil pump chain
6 | Oil pump sprocket
7 | Front
8 | Inner rotor
9 | Outer rotor
10 | Oil in
11 | Relief valve component
12 | Back
13 | Oil out

• An efficient and compact 5-lobe epitrochoid and 6-flank inner envelope type gear have 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 unit.

Oil pump spec.

Item | Engine speed [rpm] | Specification
--- | --- | ---
Discharging pressure [Oil temperature: 100°C {212°F}] | (kPa {kgf/cm2, psi}) | 1,500 | 116-302 {1.19-3.07, 16.9-43.8}
3,000 | 300-549 {3.06-5.59, 43.6-79.6}

• 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. The wear resistance has been improved by the nitriding processing of the pin constructing the oil pump chain.

Oil pump chain spec.

Item | Specification
--- | ---
Pitch size | (mm {in}) | 6.35 {0.25}
Number of pitches |  | 68

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1 | Timing chain
2 | Oil pump chain
3 | Pitch size
4 | Pitch
5 | Link
6 | Oil pump sprocket