OIL PUMP CONSTRUCTION [LF]

B3E011101008T11
• 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 sprocket, oil pump chain, oil pump chain guide, oil pump chain tensioner, and oil pump chain tensioner spring.
• An efficient and compact five-lobe epitrochoid and six-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.

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
Rear
13
Oil out

Oil pump

Item

Engine speed [rpm]

Specification
Oil discharge pressure (approx. quantity)
[Oil temperature: 100 °C {212 °F}]
1,500
129- 269 {1.32-2.74, 18.7-39.0}
3,000
234-521 {2.39-5.31, 33.9-75.5}
(kPa {kgf/cm2, psi})
Relief valve opening pressure (approx. quantity)
(kPa {kgf/cm2, psi})
500-600 {5.09-6.11, 72.6-87.0}

• 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 pins constructing the oil pump chain.
•  The oil pump sprocket is sintere hardened metals to improve durability.

1
Timing chain
2
Oil pump driven chain
3
Pitch size
4
Pitch
5
Link
6
Oil pump sprocket
7
Outer diameter
8
Driven tooth width

Oil pump driven chain, oil pump sprocket

Item

Specification
Oil pump driven chain
Pitch size
(mm {in})
8 {0.3}
Number of pitches
 
54
Oil pump sprocket
Outer diameter
(mm {in})
60.78 {2.392}
Drive tooth width
(mm {in})
6.15 {0.242}