Dirty oil filter or oil cooler:
Change oil and oil filter. If problem persists, check
the operation of bypass valve for the filer. Clean or
install new oil cooler core.
Diesel fuel in lubrication oil:
Find the place where diesel fuel gets into the
lubrication oil. Pressure check the fuel system to
check for porosity in the cylinder head or a leaking
O-ring seal on an injector. Make repairs as
needed. Remove the lubrication oil that has diesel
fuel in it. Install new oil filter. Fill the engine with
clean oil. Refer to Problem No. 34, Fuel In
Oil pump has a defect:
Repair or replace oil pump.
Oil pump suction pipe has a defect:
Replacement of pipe is needed.
Oil pressure relief valve does not dose:
Clean valve and housing. Install new parts as
necessary. Check bypass valves in oil cooler and
oil filter base.
Too much clearance between rocker arm shaft and
Check lubrication in valve compartments. Install
new parts as necessary.
Too much clearance between camshaft and camshaft
Install new camshaft and camshaft bearings if
Too much clearance between crankshaft and crankshaft
Inspect the bearings and make replacement as
Problem 25: Engine Uses Too Much
Too Much Lubrication Oil In The Engine
Oil Temperature Is Too High
Worn Valve Guide Seals
Worn Pistons, Rings Or Cylinder Walls
Failure Of Seal Rings In Turbocharger
Worn Valve Guides
Too much lubrication oil in engine:
Remove extra oil. Find where extra oil comes from.
Put correct amount of oil in engine.
Find all oil leaks. Make repairs as needed. Check
for a dirty crankcase breather.
Oil temperature is too high:
Check operation of oil cooler. Install new pads if
necessary. Clean the core of the oil cooler.
Worn valve guide seals:
Replace as necessary.
Worn pistons, rings or cylinder walls:
Pistons or rings that have damage can be the
cause of too much pressure in the crankcase. This
condition will cause more than the normal amount
of fumes (blow-by) coming from the crankcase
breather. The 8T2700 Indicator Group is used to
check the amount of blow-by. The test procedure is
in Special Instruction, SEHS8712. Inspect and
install new pads as needed.
Failure of seal rings in turbocharger:
Check inlet manifold for oil and make repairs to the
turbocharger if necessary.
Worn valve guides:
See the Specifications Section of the Service
Manual for the maximum permissible wear of the
valve guides. If necessary, recondition the cylinder