The Bomag 05741859 Piston Ring is a genuine OEM component designed for Bomag tandem rollers across the BW 100, BW 115, BW 120, BW 125, BW 131, BW 135, and BW 138 series. Sourced directly from Bomag, this piston ring delivers the exact dimensional tolerances and material grade required for a correct engine seal. Confirmed fitment includes the BW 100 AD-4, BW 100 AC-4, BW 100 AD-5, BW 100 AC-5, BW 115 AC-3, BW 115 AD-3, BW 120 AD-4, BW 120 AC-4, BW 120 AD-5, BW 120 AC-5, BW 120AD 4, BW 125 AD-4, BW 125 AC-4, BW 131 AD-5, BW 135 AD-5, BW 138 AC-5, and BW 138 AD-5 tandem rollers.
Key Features
- OEM Ring Geometry — manufactured to Bomag's original bore diameter, ring width, and gap specifications for a correct cylinder seal every time
- Direct Engine Replacement — installs into the piston ring grooves exactly as the original, with no reworking of the cylinder or piston required
- Broad Tandem Roller Coverage — fits BW 100, BW 115, BW 120, BW 125, BW 131, BW 135, and BW 138 series tandem rollers including -3, -4, and -5 generation variants
- Compression and Oil Control — maintains proper combustion chamber pressure and controls oil consumption, keeping the engine running at its rated output
- Fuel System Integrity — a correctly seated piston ring prevents blow-by gases from contaminating the crankcase, protecting oil quality and extending engine service intervals
The piston ring sits in a machined groove around the piston and forms a dynamic seal between the piston and the cylinder wall. Its primary job is to contain combustion pressure above the piston so that it drives the crankshaft efficiently, while also scraping excess oil back down into the sump to prevent burning. When a piston ring wears, loses tension, or breaks, combustion gases escape past the piston — a condition known as blow-by — which causes a loss of power, increased oil consumption, and accelerated internal engine wear that can lead to a full engine rebuild if left unaddressed.
Part Details
| Part Number | 05741859 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Piston Ring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Tandem Roller | BW 100 AD-4 | 00818465, 00824271, 00824273 |
| Tandem Roller | BW 100 AC-4 | 00818467, 00818731 |
| Tandem Roller | BW 120 AD-4 | 00818469, 00818477, 00818593, 00818733, 00824173 |
| Tandem Roller | BW 120 AC-4 | 00818471, 00818597 |
| Tandem Roller | BW 125 AD-4 | 00818473 |
| Tandem Roller | BW 125 AC-4 | 00818475 |
| Tandem Roller | BW120AD 4 | 00818595, 00818871 |
| Tandem Roller | BW 115 AC-3 | 00818693 |
| Tandem Roller | BW 115 AD-3 | 00818695 |
| Tandem Roller | BW 138 AC-5 | 00818719 |
| Tandem Roller | BW 138 AD-5 | 00818721, 00824175 |
| Tandem Roller | BW 135 AD-5 | 00818723 |
| Tandem Roller | BW 100 AD-5 | 00824029, 00824561 |
| Tandem Roller | BW 120 AC-5 | 00824031 |
| Tandem Roller | BW 120 AD-5 | 00824033, 00824563 |
| Tandem Roller | BW 100 AC-5 | 00824275 |
| Tandem Roller | BW 131 AD-5 | 00824935 |
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.
