The Wacker Neuson 0.50 Piston is a genuine OEM component designed for GP3800A and GP5600A portable generators and PT3A series trash pumps. As an oversized service piston at the 0.50mm oversize specification, this part is engineered to restore proper bore clearance during engine rebuilds on these Wacker Neuson units. Genuine OEM sourcing means the meets the original dimensional and metallurgical standards set for these engines, ensuring a correct fit within the cylinder bore without modification.
Key Features
- Correct Oversize Specification: — Machined to the 0.50mm oversize dimension, this piston pairs correctly with a bored or honed cylinder — no guesswork on sizing during your engine rebuild.
- Genuine OEM Metallurgy: — Cast to the same alloy and ring-groove tolerances as the original production piston, maintaining the compression ratio and thermal expansion behavior the engine was designed around.
- Broad Model Coverage: — Fits GP3800A and GP5600A portable generator variants (including wheel kit and electric start configurations), as well as PT3A 75mm/3 in. centrifugal trash pump models.
- Compression Restoration: — A worn or out-of-spec piston causes low compression, hard starting, and excessive oil consumption. Installing the correct oversized piston brings compression back to operating spec and extends engine service life.
- Fuel System Integrity: — Proper piston-to-wall clearance prevents blow-by, which can contaminate the crankcase oil and accelerate wear on bearings and rings — critical in generator and pump applications running under sustained load.
The piston is the reciprocating component inside the engine cylinder that converts combustion pressure into crankshaft rotation. It seals combustion gases above it through a set of piston rings while transferring force through the wrist pin to the connecting rod. When the piston wears beyond its serviceable diameter, compression drops, oil consumption rises, and the engine loses the power output needed to drive a generator or pump at rated capacity. An oversized piston like the 5000162639 is used in conjunction with cylinder boring or honing to return the engine to a like-new fit, restoring compression and overall performance.
Part Details
| Part Number | 5000162639 |
|---|---|
| Old Part Number | 0162639 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | 0.50 Piston |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Portable Generator | GP3800A | 5000620104, 5000620379, 5000620485, 5000620342, 5000620484, 5000620041, 5000620103, 5000620010 |
| PT3A | PT3A | 5000009101, 5000009240, 5000009098, 5000620800 |
| Premium Portable Generator | GP5600A | 5000620094, 5000620095, 5000620042, 5000620043, 5000620091, 5000620092, 5000620011, 5000620012, 5000620381, 5000620382 |
| GPS5600A,CAN GFI | GPS5600A | 5000620096, 5000620044, 5000620093, 5000620013, 5000620383 |
| GP3800A Generator, EPA | GP3800 | 5000620974, 5000620975, 5000620976 |
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.
