Wacker Neuson 5000157798 Piston Assembly, Oversized

The Wacker Neuson is a genuine OEM Piston Assembly, Oversized designed for the CRT48-31V series ride-on concrete trowels. Sourced directly from Wacker Neuson, this oversized piston assembly is engineered to restore proper cylinder-to-piston clearance during engine overhaul or rebuild when bore wear has exceeded standard tolerances. It is confirmed compatible with the CRT48-31V, CRT48-31V-H High Speed, CRT48-31V-E, CRT48-31V-ES-E, and CRT48-31V-ES Electronic Steering models. Using the correct OEM oversized specification ensures the engine returns to proper compression and power output after a bore has been machined or honed to the matching oversize dimension.

Key Features

• OEM Compression Spec: — Cast and machined to Wacker Neuson's exact oversize tolerance, ensuring proper ring seal and compression recovery after a cylinder bore has been machined.
• Oversized Rebuild Fitment: — Matched to the correct oversize dimension for engines that have been bored or honed beyond standard clearance — installs in place of the standard piston without further machining when the bore is prepared to spec.
• CRT48-31V Series Coverage: — Fits the full CRT48-31V family, including the standard, High Speed (CRT48-31V-H), Electronic Steering (CRT48-31V-ES), and electric-variant (CRT48-31V-E and CRT48-31V-ES-E) ride-on trowel models.
• Restored Engine Power Output: — A worn or out-of-spec piston causes low compression, excessive oil consumption, and loss of finishing torque. This assembly brings the engine back to full operating condition.
• Fuel System Integrity: — Correct piston-to-wall clearance prevents blow-by, protecting the lubrication system and extending service life of rings and bearings after the rebuild.

The piston assembly is a core reciprocating component inside the engine's cylinder bore. It converts combustion pressure into crankshaft rotation, and its fit within the bore determines compression efficiency, oil control, and overall power delivery. In a ride-on concrete trowel like the CRT48-31V series, consistent engine output is critical for maintaining steady rotor speed across large finishing passes. When a piston or bore wears beyond serviceable limits, compression drops, oil consumption rises, and the engine loses the torque needed to drive the finishing rotors effectively. An oversized piston assembly is used specifically when the cylinder bore has been machined to a larger dimension to remove wear — installing this part with a properly prepared bore restores the engine to like-new compression and performance.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

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