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1106 Perkins diesel - Lubrication System (Inspect and adjust)
Low Oil Pressure - The following conditions will cause low oil pressure:
The oil level is low in the crankcase. A restriction exists on the oil
suction screen. Connections in the oil lines are leaking. The connecting
rod or the main bearings are worn. The rotors in the oil pump are worn.
The oil pressure relief valve is operating incorrectly.
A worn oil pressure relief valve can allow oil to leak through the valve
which lowers the oil pressure. When the 1106 Perkins diesel runs at the
normal temperature for operation and at high idle, the oil pressure must
be a minimum of 280 kPa (40 psi). A lower pressure is normal at low
idle. A suitable pressure gauge can be used in order to test the
pressure of the lubrication system.
High Oil Pressure - High oil pressure can be caused by the following
conditions: The spring for the oil pressure relief valve is installed
incorrectly. The plunger for the oil pressure relief valve becomes
jammed in the closed position. Excessive sludge exists in the oil which
makes the viscosity of the oil too high.
Engine Oil Pump Inspect - If any part of the oil pump is worn enough in
order to affect the performance of the oil pump, the oil pump must be
replaced. Perform the following procedures in order to inspect the oil
pump.
Remove the oil pump from the engine. Remove the cover of the oil pump.
Remove the outer rotor (1). Clean all of the parts. Look for cracks in
the metal or other damage. Install the outer rotor. Measure the
clearance of the outer rotor to the body.
Clearance for the inner rotor body - Measure the clearance of the inner
rotor to the outer rotor (2).
End play measurement of the rotor - Measure the end play of the rotor
with a straight edge and a feeler gauge (3). Clean the top face of the
oil pump and the bottom face of the cover. Install the cover on the oil
pump. Install the oil pump on the engine.
Excessive Bearing Wear Inspect - When some components of the 1106
Perkins diesel show bearing wear in a short time, the cause can be a
restriction in an oil passage. An engine oil pressure indicator may show
that there is enough oil pressure, but a component is worn due to a lack
of lubrication. In such a case, look at the passage for the oil supply
to the component. A restriction in an oil supply passage will not allow
enough lubrication to reach a component. This will result in early wear.
Engine Oil Leaks on the Outside of the Engine - Check for leakage at the
seals at each end of the crankshaft. Look for leakage at the gasket for
the engine oil pan and all lubrication system connections. Look for any
engine oil that may be leaking from the crankcase breather. This can be
caused by combustion gas leakage around the pistons. A dirty crankcase
breather will cause high pressure in the crankcase. A dirty crankcase
breather will cause the gaskets and the seals to leak.
Engine Oil Leaks into the Combustion Area of the Cylinders - Engine oil
that is leaking into the combustion area of the cylinders can be the
cause of blue smoke. There are several possible ways for engine oil to
leak into the combustion area of the cylinders: Failed valve stem seals.
Leaks between worn valve guides and valve stems. Worn components or
damaged components (pistons, piston rings, or dirty return holes for the
engine oil). Incorrect installation of the compression ring and/or the
intermediate ring. Leaks past the seal rings in the turbocharger shaft.
Overfilling of the crankcase. Wrong dipstick or guide tube. Sustained
operation at light loads.
Excessive consumption of engine oil can also result if engine oil with
the wrong viscosity is used. Engine oil with a thin viscosity can be
caused by fuel leakage into the crankcase or by increased engine
temperature.
Increased Engine Oil Temperature - Look for a restriction in the oil
passages of the oil cooler. The oil temperature may be higher than
normal when the engine is operating. In such a case, the oil cooler may
have a restriction.
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