LUBRICATION SYSTEM
9-4
2. Disassembling, inspecting and reassembling lubrication system
2.1 Inspecting the oil pump
Check the oil pump for any damage, and whether or not it
rotates smoothly. If faulty, replace the entire pump
assembly.
Inspecting oil pump
2.2 Inspecting relief valve
(1)
Check the relief valve and its valve seat for contact
condition. Check the spring for fatigue and damage. If
it is faulty, replace the relief valve with new one.
(2) Measure the valve opening pressure (oil pressure when
the engine is running at rated speed) of the relief valve.
If the measured value is out of the standard, remove the
plug and make an adjustment by increasing and
decreasing the shim thickness.
Engine oil pressure take-out port
Next to the oil filter　Rp 1/8 thread (PS 1/8)
Inspecting relief valve
Engine oil pressure measuring port
Inspect for damage and smooth rotation
Item Standard
Relief valve opening pressure
0.3 to 0.4 MPa {3 to 4 kgf/cm²}
[43 to 57 psi]
Plug
44 ± 4.9 N·m
{4.5 ± 0.5 kgf·m}
[32.5 ± 3.6 lbf·ft]
Shim
Valve housing
49 ± 4.9 N·m
{5 ± 0.5 kgf·m}
[36.2 ± 3.6 lbf·ft]
Engine oil pressure
measuring port (Rp 1/8)
(Engine oil
pressure switch
installation part)
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