Source of Elements in Your Engine Oil| ��Ƭ Machinery

Guide For Engine Element Sources

Key to element symbols:

Al = Aluminum
Cr = Chromium
Cu = Copper
Fe = Iron
Pb = Lead
Mo = Molybdenum
Si = Silicon
Na = Sodium
Sn = Tin

Engine Element Sources	Element
Possible Source	Al	Cr	Cu	Fe	Pb	Mo	Si	Na	Sn
Aftercooler leak			•
Air compressor				•
Air compressor bearings			•		•
Air compressor main bearings			•
Air compressor piston rings				•
Air compressor rod bearings	•
Anti-seize compounds (no failure)	•		•
Balancer bearing	•
Balancer gears and shaft				•
Cam follower				•
Possible Source	Al	Cr	Cu	Fe	Pb	Mo	Si	Na	Sn
Cam follower roller pin			•
Cam follower roller shaft			•
Cam follower rollers				•
Cam followers				•
Camshaft				•
Camshaft and followers				•
Camshaft bearings	•				•				•
Camshaft bushings			•
Camshaft lifter roller pins			•
Chrome plated crankshaft (field salvage)		•
Possible Source	Al	Cr	Cu	Fe	Pb	Mo	Si	Na	Sn
Condensation							•	•
Coolant entry								•
Cooling systems leaks from oil cooler, gaskets or aftercooler			•
Crankshaft				•
Crankshaft thrust bearing (early engines)	•
Crankshaft thrust bearing (later models)			•
Cylinder walls				•
Dirt entry							•
Dirt entry (clay soils)	•
Engine and scavage oil pump bearings	•				•				•
Possible Source	Al	Cr	Cu	Fe	Pb	Mo	Si	Na	Sn
Front and rear gear train thrust bearing			•
Front and rear gears				•
Front and rear idler gear thrust bearing			•
Front balance gear bushings					•				•
Front balancer gear bushing	•
Front idler gear bushings	•
Fuel pump housing bearings			•
Governor bushings			•
Governor drive and bushings			•
Main or rod bearings	•				•
Possible Source	Al	Cr	Cu	Fe	Pb	Mo	Si	Na	Sn
Oil additives (no failure)			•			•	•	•	•
Oil cooler core tubes leaching (no failure on oil side)			•
Oil pump bearings	•
Oil pump body	•
Oil pump bushings	•
Oil pump shafts, gears and body				•
Oil pump thrust washer			•
Overlay on main and rod bearings					•
Piston pin bushings			•
Piston rings		•
Possible Source	Al	Cr	Cu	Fe	Pb	Mo	Si	Na	Sn
Piston skirts	•
Pistons	•
Plasma coated piston rings						•
Rear accessory drive bushings	•				•				•
Rear accessory drive thrust washer			•
Rear cluster gear bearings			•
Rear cluster gear bushings			•
Rear idler gear bushings			•
Rocker arm bushings	•		•
Rocker arms				•
Possible Source	Al	Cr	Cu	Fe	Pb	Mo	Si	Na	Sn
Rod bearings	•
Scavenge pump screen (earlier models)			•
Service meter drive gear			•
Silicon additives (no failure)							•
Silicon grease (no failure)							•
Timing gear bearings	•								•
Timing gear bushings	•
Timing gear cover	•
Timing gear thrust bearings			•
Timing gear thrust washers			•
Possible Source	Al	Cr	Cu	Fe	Pb	Mo	Si	Na	Sn
Timing gears				•
Top piston ring plasma coated						•
Turbocharger thrust bearing	•
Turbocharger thrust or sleeve bearings			•
Valves, valve seats, guides and push rods				•
Water entry								•
Water pump bearings				•					•
Water pump thrust bearing			•
Wrist pin bushings			•
Possible Source	Al	Cr	Cu	Fe	Pb	Mo	Si	Na	Sn

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Guide For Engine Element Sources

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