Multiquip 1685121903 Piston +0.25MM

The Multiquip 1685121903 Piston +0.25MM is a genuine OEM oversized piston designed for DAC7000SS, DAC7000SSW, DAC7000SSA, and DLW300ES series equipment. As a direct OEM component, it is manufactured to the exact tolerances required for proper fitment in bored or honed cylinders on these units. Sourced directly through Multiquip's authorized parts network, this piston ensures the engine is restored to correct compression and displacement specification following a cylinder overhaul. Confirm your model code against the fitment list before ordering to ensure proper sizing compatibility with your specific machine.

Key Features

• Oversized OEM Piston Spec — Machined to the +0.25MM oversize dimension, intended for use in cylinders that have been bored or honed beyond standard bore diameter.
• Genuine Multiquip OEM Component — Sourced directly from Multiquip, ensuring the correct alloy composition, ring groove geometry, and pin bore alignment for this engine family.
• Confirmed Fitment — Compatible with DAC7000SS, DAC7000SSW, and DAC7000SSA ultra-silent diesel generators and DLW300ES series diesel light welders.
• Restored Compression Performance — A correctly sized oversize piston seals against the cylinder wall to restore proper compression, preventing oil blow-by, misfires, and power loss that a worn or undersized piston causes.
• Engine Rebuild Integrity — Using the correct OEM oversize piston during a top-end rebuild protects the investment of a cylinder bore job and avoids the premature wear associated with mismatched components.

The piston is the reciprocating component inside the engine cylinder that converts combustion pressure into mechanical force to drive the crankshaft. When an engine cylinder is worn, scored, or out of round, the bore is machined to a larger diameter — and an oversized piston, such as this +0.25MM variant, is installed to restore the proper fit and seal between the piston and cylinder wall. Without the correct oversize match, combustion gases escape past the piston rings, causing loss of power, increased oil consumption, and eventual engine failure. Using the right oversized piston is a critical step in any successful engine overhaul on these generator and welder platforms.

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.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.