CATEngine Parts

1078256 Piston As-(Os 0.50Mm) — Cat 315 315B

This piston assembly, with an oversized diameter of 0.50mm, is a key component within the engine's cylinders, converting combustion pressure into rotational force. Manufactured to meet CTP aftermarket standards, it provides a reliable replacement for worn or damaged pistons that exhibit scoring or reduced compression. Operators will experience symptoms such as engine misfires, excessive oil consumption, and a noticeable loss of power when a piston is failing.

Piston As-(Os 0.50Mm) – Part No 1078256 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypePiston Assembly (Oversize)
MaterialAluminum Alloy
ApplicationCAT Engine Cylinder
Service LifeReplace as needed based on inspection
CompatibilityCAT 315, 315B, 933, 933C, 939
ConditionNew — CTP aftermarket replacement

Failure Symptoms

A failing piston will first present as increased oil consumption and a rougher engine idle due to blow-by past the rings. If left unaddressed, the piston can overheat, leading to scuffing, ring land damage, or even seizure within the cylinder bore. Continued operation risks severe cylinder wall damage and potential connecting rod failure.

Installation Tip

Ensure the piston rings are correctly seated in their respective grooves and that the ring gaps are properly staggered. Never force a piston into the cylinder bore; use a proper ring compressor tool to avoid damaging the piston or cylinder walls.

Service Note

Always replace the piston rings and inspect/replace the connecting rod bearings when installing a new piston assembly.