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4. LUBRICATION SYSTEM DOWNTOWN 125i
SERVICE INFORMATION
GENERAL INSTRUCTIONS
· The maintenance of lubrication system can be performed with the engine installed in the frame.
· Drain the coolant before starting any operations.
· Be careful 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
Standard
Inner rotor-to-outer rotor clearance 0.15
Outer rotor-to-pump body clearance 0.150.2
Rotor end-to-pump body clearance 0.040.09
ENGINE OIL
At disassembly: 1.2 liter
Engine Oil Capacity
At change: 1.0 liter
Recommended Oil SAE15W40 API: SJ
TROUBLESHOOTING
Oil level too low Poor lubrication pressure
· Natural oil consumption · Oil level too low
· Oil leaks · Clogged oil filter or oil passage
· Worn piston rings · Faulty oil pump
· Worn valve guide
· Worn valve guide seal
Oil contamination
· Oil not changed often enough
· Faulty cylinder head gasket
· Loose cylinder head bolts
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