OIL PUMP CONSTRUCTION [L8, LF, L3]
id0111b21006b1
• 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
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Oil pump body (relief valve inside)
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2
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Oil pump chain tensioner
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3
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Oil pump chain guide
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4
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Oil pump chain
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5
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Oil pump sprocket
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6
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Front
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7
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Inner rotor
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8
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Outer rotor
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9
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Oil in
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10
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Relief valve component
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11
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Rear
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12
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Oil out
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Oil pump specification
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Item
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Engine speed [rpm]
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Specification [kPa {kgf/cm2, psi}]
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L8
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LF
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L3
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Oil discharge pressure (reference value)
[Oil temperature: 100 °C {212 °F}]
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1,500
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129-269 {1.32-2.74, 18.7-39.0}
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180-387 {1.84-3.95, 26.2-56.1}
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3,000
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234-521 {2.39-5.31, 33.9-75.5}
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337-591 {3.44-6.03, 49.0-85.8}
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Relief valve opening pressure (reference value)
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450-550 {4.59-5.61, 65.3-79.8}
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420-520 {4.28-5.30, 60.9-75.4}
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• 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
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Timing chain
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2
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Oil pump driven chain
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3
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Pitch size
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4
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Pin
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5
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Link
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6
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Oil pump sprocket
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7
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Outer diameter
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8
|
Driven tooth width
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Oil pump driven chain, oil pump sprocket specification
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Item
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Specification
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L8
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LF
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L3
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Oil pump driven chain
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Pitch size
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(mm {in})
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8 {0.3}
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6.35 {0.25}
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Oil pump sprocket
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Outer diameter
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(mm {in})
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60.78 {2.392}
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46.46 {1.829}
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Driven tooth width
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(mm {in})
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6.15 {0.242}
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5.7 {0.23}
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