MXU250 cap04 (lubrificazione) .pdf



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4. LUBRICATION SYSTEM

MXU 250

4
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4

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LUBRICATION SYSTEM
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SERVICE INFORMATION-----------------------------------------------TROUBLESHOOTING----------------------------------------------------ENGINE OIL/OIL FILTER -----------------------------------------------OIL PUMP --------------------------------------------------------------------

4- 2
4- 2
4- 3
4- 3

4-0

4. LUBRICATION SYSTEM

MXU 250

LUBRICATION SYSTEM

Rocker Arm Shaft

Crankshaft

Oil Filter Screen

4-1

Oil Pump

4. LUBRICATION SYSTEM

MXU 250

SERVICE INFORMATION
GENERAL INSTRUCTIONS
• The maintenance of lubrication system can be performed with the engine installed in the frame.
• Use care when removing and installing the oil pump not to allow dust and foreign matters to
enter the engine and oil line.
• Do not attempt to disassemble the oil pump. The oil pump must be replaced as a set when it
reaches its service limit.
• After the oil pump is installed, check each part for oil leaks.
SPECIFICATIONS

Unit: mm (in)

Item
Inner rotor-to-outer rotor clearance

Standard
0.15 (0.006)

Oil pump Outer rotor-to-pump body clearance 0.15~0.2 (0.006~0.008)
Rotor end-to-pump body clearance

Service Limit
0.2 (0.008)
0.25 (0.01)

0.04~0.09 (0.0016~0.0036) 0.12 (0.0048)

TROUBLESHOOTING
Oil level too low
• Natural oil consumption
• Oil leaks
• Worn or poorly installed piston rings
• Worn valve guide or seal

Poor lubrication pressure
• Oil level too low
• Clogged oil filter or oil passages
• Not use the specified oil

4-2

4. LUBRICATION SYSTEM

MXU 250

ENGINE OIL/OIL FILTER
OIL LEVEL AND OIL CHANGE
Refer to the “ENGINE OIL” section in the
chapter 3 to check the oil level and
replacement and oil filter cleaning.

OIL PUMP
REMOVAL
Remove the right crankcase cover and the
A.C. generator flywheel. (Refer to the “A.C.
GENERATOR/FLYWHEEL” section in the
chapter 16)
Remove the starter clutch gear. (Refer to the
“STARTER CLUTCH” section in the
chapter 18)
Bolts

Remove the two bolts and oil separator
cover.

Oil Separator Cover

Pry off and remove the circlip from oil
driven sprocket.

Circlip

4-3

4. LUBRICATION SYSTEM
Remove the oil pump drive chain and oil
driven sprocket.

MXU 250
Oil Pump Driven Sprocket

Oil Pump Drive Chain

Remove the two oil pump bolts for remove
the oil pump.

Oil Pump Bolts

Screw

OIL PUMP DISASSEMBLY
Remove the screw and disassemble the oil
pump.

Pump Body

INSPECTION
Measure the rotor end-to-pump body
clearance.
Service Limit: 0.12 mm (0.0048 in)

4-4

4. LUBRICATION SYSTEM

MXU 250
Inner Rotor

Measure the inner rotor-to-outer rotor
clearance.
Service Limit: 0.2 mm (0.008 in)

Outer Rotor

Measure the pump body-to-outer rotor
clearance.
Service Limit: 0.25 mm (0.01 in)

Outer Rotor

Pump Body

ASSEMBLY
Install the outer rotor, inner rotor and pump
shaft into the pump body.

Pump Cover

Outer Rotor

* Insert the pump shaft by aligning the flat
on the shaft with the flat in the inner
rotor.
Install the dowel pin.
Install the pump cover by aligning the hole
in the cover with the dowel pin.
Tighten the screw to secure the pump cover.
Inner Rotor

INSTALLATION
Reverse the “OIL PUMP REMOVAL”
procedures.

* Install the oil pump with the arrow on
the pump body facing up and fill the oil
pump with engine oil before installation.

Oil Pump Bolts

4-5

Dowel Pin

4. LUBRICATION SYSTEM
Make sure that the pump shaft rotates freely
without binding.

MXU 250
Pump Shaft

Install oil pump driven sprocket and drive
chain, circlip and oil separator cover.

4-6


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