AEDSF/3-301B | Yanmar Piston Assembly 4D98E +0.25mm

Yanmar 4D98E / 4TNE98 Piston Assembly +0.25mm Oversize

Replacement +0.25 mm oversize piston assembly for selected Yanmar 4D98E and compatible 4TNE98 diesel engine applications used in forklifts, industrial machinery and material-handling equipment.

This piston assembly is intended for compatible engines requiring an oversize piston during engine rebuilding, cylinder-bore reconditioning or replacement of worn piston components.

The +0.25 mm designation identifies a piston oversize relative to the standard cylinder-bore specification.

The piston transfers combustion forces through the piston pin and connecting rod to the crankshaft. Correct piston dimensions, crown configuration, cylinder clearance and installation are essential for reliable engine operation.

Product Specifications

• Sunbrite SKU: AEDSF/3-301B

• Product Type: Oversize Piston Assembly

• Engine Reference: 4D98E

• Related Engine Family: Selected Yanmar 4TNE98 configurations — verify compatibility

• Piston Size: +0.25 mm Oversize

• Nominal Standard Engine Bore: 98.00 mm

• Nominal Oversize Bore: 98.25 mm

• Yanmar Manufacturer Part Number: To be confirmed

• Material: Metal alloy — exact grade to be confirmed

• Condition: New

• Manufacturer Type: Aftermarket

• Piston Pin: Confirm inclusion

• Retaining Clips / Snap Rings: Confirm inclusion

• Piston Rings: Confirm whether included

• Quantity Supplied: Confirm individual assembly or complete set

Product Features

• +0.25 mm oversize piston for compatible Yanmar diesel engines

• Intended for correctly specified engine repairs and rebuilding

• Suitable for engines requiring appropriately machined oversize cylinder bores

• Supports combustion-force transfer through the connecting rod

• Designed for use with correctly matched piston pins and retaining clips

• Suitable for selected industrial and forklift engine applications

Engine and Forklift Compatibility

This product is listed for the 4D98E engine family, with potential compatibility across selected 4TNE98 configurations.

Compatibility with individual Heli, JAC or other forklift models must be confirmed using the forklift model, engine identification and original piston part number.

Important Ordering Information

Before ordering, please confirm:

• Exact engine model and serial number

• Original piston manufacturer reference

• Required +0.25 mm oversize specification

• Direct-injection or indirect-injection engine configuration

• Piston crown and combustion chamber design

• Measured cylinder-bore diameter

• Required piston-to-cylinder clearance

• Piston pin diameter and length

• Retaining clip dimensions

• Whether piston rings are included

• Quantity supplied per order

Important: A +0.25 mm oversize piston must only be installed in a correctly prepared and measured cylinder bore. It is not a direct replacement for a standard-size piston without appropriate engine machining.

Piston selection and installation should be undertaken by a qualified diesel engine technician following the applicable manufacturer's specifications.

Contact Sunbrite Forklifts South Africa for assistance with product identification, compatibility, pricing and availability.