EIC Technical Information

REO TECHNOLOGY CORP.

KOMATSU ENGINE PARTS , TRUCK ENGINE PARTS , LINER KITS
000000	Piston Damage-Cause and Remedies Supported by MAHLE GmbH(All Right Reseved)		000000
	◆Listed according to the cause of the damage 1 Piston Skirt 1.1 Fitting clearance 1.2 Lack of lubricating oil 1.3 Overheating-skirt seizure 1.4 Clearance between gudgeon pin and piston or gudgeon pin and connecting rod 1.5 Oblique running 1.6 Cylinder deformation 1.7 Wear caused by dirt 1.8 Fuel scuffing 1.9 Skirt corrosion 2 Ring belt 2.1 Piston rings 2.1.1 Malfuction(jamming) 2.1.2 Scuffed rings 2.1.3 Oil control rings 2.1.4 Piston ring breakage 2.1.5 Wear on rings and grooves 2.1.6 Wear on multi-piece oil control rings 2.1.7 Oil dilution caused by unburnt fuel 2.2 Ring lands 2.2.1 Breakage caused by mechanical overload 2.2.2 Breakage caused by faulty combustion 3 Piston crown 3.1 Faulty combustion(burnt holes),Auto and Diesel engines 3.2.1 Faulty combustion(melting),Auto engine 3.2.2 Faulty combustion(melting),Diesel engine 3.3.1 Impacts on valves or cylinder head 3.3.2 Yielding of crown 3.4 Foreign particles 3.5 Forcible action on top land 3.6 Abrasive wear on top land caused by oil carbon deposites,Auto and Diesel engines 3.7 Erosion 3.8 Thermal overload(crown) 3.9 Thermal overload(rim of combustion cavity)	◆Listed according to the type of damage Piston Skirt Seizure on major and minor thrust sides(skirt area only) Seizures on one side of skirt Seizures in the upper skirt area and at the ring belt Seizures in diagonal direction near the gudgeon pin bore Asymmetrical wear pattern in the direction of pin axis Seizures in the lower skirt area only Heavy wear on the skirt,with a rough,matt surface Scuff areas on the side(fuel scuffing) Piston surface scarred by corrosion Ring belt Piston rings Scuffed rings and oblique running(a symmetrical wear pattern) Scuffed rings and skirt seizures Scuffed ring caused by excessive oil scraping action Ring belt damaged by broken piston rings Multi-piece oil control rings exhibit ridges Heavy radial wear on rings Ring lands Broken ring lands caused by mechanical overload Broken ring lands caused by faulty combustin Piston crown Burnt-through piston crown,Auto & Diesel engines Melting of the piston crown and top land,Auto engine Melting of the piston crown and top land,Diesel engine Valve impacts on crown and impacts on cylinder head Yielding of piston crown Foreign particles beaten into crown Breakage of top land Edge of crown or edge of top land worn by abrasion Erosion on crown and top land Cracks in piston crown Cracks at rim of combustion cavity
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