OIL PUMP CONSTRUCTION [LF, L3]

id0111001006b5

• 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.

Oil pump

Item

Engine speed [rpm]

Specification

LF

L3

Oil discharge pressure (approx. quantity)
[Oil temperature: 100 °C {212 °F}]
1,500
129- 269
{1.32-2.74, 18.7-39.0}
193-400
{1.97-4.07, 27.9-58.0}
3,000
234-521
{2.39-5.31, 33.9-75.5}
395-649
{4.03-6.61, 57.3-94.1}
(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.

Oil pump driven chain, oil pump sprocket

Item

Specification

LF

L3

Oil pump driven chain
Pitch size
(mm {in})
8 {0.3}
6.35 {0.25}
Number of pitches

 

54
66
Oil pump sprocket
Outer diameter
(mm {in})
60.78 {2.392}
46.46 {1.829}
Drive tooth width
(mm {in})
6.15 {0.242}
5.7 {0.23}