LUBRICATION
01–11–4
OIL PUMP CONSTRUCTION [LF]
E5 U0111141 00 N0 1
• 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.
Oil pump specification
• 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.
Item Engine speed [rpm]
Specification [kPa {kgf/cm
2
, psi}]
Oil discharge pressure (reference value)
[Oil temperature: 100 °C {212 °F}]
1,500 180— 387 {1.84—3.95, 26.2—56.1}
3,000 337—591 {3.44—6.03, 49.0—85.8}
Relief valve opening pressure (reference value) 420—520 {4.28—5.30, 60.9—75.4}
OIL PUMP BODY
(RELIEF VALVE
INSIDE)
OIL PUMP CHAIN GUIDE
OIL PUMP CHAIN
OIL PUMP SPROCKET
FRONT
INNER ROTOR
OUTER ROTOR
OIL IN
RELIEF VALVE COMPONENT
BACK
OIL OUT
OIL PUMP CHAIN
TENSIONER
EPU111ZS3008
TIMING CHAIN
OIL PUMP SPROCKET
OIL PUMP DRIVEN CHAIN
PITCH SIZE
PIN
LINK
OUTER
DIAMETER
OIL PUMP SPROCKET
DRIVEN
TOOTH WIDTH
EPU111ZS3005
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