TESTING AND ADJUSTING
25. ENGINE HAS LOW OIL PRESSURE
Dirty Oil Filters or Oil Cooler
Check the operation of bypass valve for the filter. Install
new oil filters if needed. Clean or install new oil cooler
core. Remove dirty oil from engine. Put clean oil in
Diesel Fuel in Lubrication Oil
Find the place where diesel fuel gets into the lubrication
oil. Make repairs as needed. Remove the lubrication oil
that has diesel fuel in it. Install new oil filters. Put clean
oil in the engine.
Too Much Clearance Between Rocker Arm Shaft
Check lubrication in valve compartments. Install
and Rocker Arms
new parts as necessary.
Oil Pump Suction Pipe Has A Defect
Replacement of pipe is needed.
Oil Pressure Relief Does Not Close
Clean valve and housing.
Install new parts as
Oil Pump Has A Defect
Repair or replace oil pump.
Too Much Clearance Between Crankshaft and
Inspect the bearings and make replacement as
Too Much Clearance Between Camshaft and Cam-
Install new camshaft and camshaft bearings if
Defect in Oil Pressure Gauge
Install new gauge.
26. ENGINE USES TOO MUCH LUBRICATION OIL
Too Much Lubrication Oil In Engine
Remove extra oil. Find where extra oil comes from. Put
correct amount of oil in engine. Do not put too much oil
Find all oil leaks. Make repairs as needed. Check for
dirty crankcase breather.
Oil Temperature is Too High
Check operation of oil cooler. Install new parts if
necessary. Clean the core of the oil cooler.
Too Much Oil in the Valve Compartment
Be sure that the dowel is installed in the left bolt hole of
the rocker shaft. The dowel is located between the
rocker shaft and valve cover base.
Worn Valve Guides
Reconditioning of the cylinder head is needed.
Worn Piston Rings
Inspect and install new parts as needed.
Failure of Seal Rings in Turbocharger
Check inlet manifold for oil and make repairs to the
turbocharger if necessary.