| Parameter | Specification |
|---|---|
| OEM Number | 860123892 |
| Brand | XCMG (Original Equipment) |
| Type | Second compression ring – internal tapered (reverse twist) |
| Material | Ductile cast iron (GGG70) with hard chrome plating |
| Bore Diameter (compatible) | 102.00 mm |
| Ring Width (axial height) | 3.00 mm ±0.01 mm |
| Radial Thickness | 4.20 mm ±0.02 mm |
| Taper Angle | 1°30′ internal taper (reverse twist design) |
| Coating / Plating | Hard chromium (Cr), 0.10 mm thickness, HV 750–900 |
| End Gap (installed) | 0.40 – 0.60 mm |
| Max Operating Temperature | 400°C |
| Surface Finish | Ra 0.2 – 0.4 μm, phosphate pre-coating |
| Quantity per Engine | 6 pieces (one per cylinder) |
| Compatible XCMG Graders | GR135, GR165, GR180, GR200, GR2003, GR215, GR260, GR300 |
The genuine 860123892 internal tapered ring features a reverse-twist design with a 1°30′ internal taper. During the downstroke, the tapered face generates hydrodynamic pressure that lifts the ring slightly, allowing oil to be scraped downward into the crankcase. This reduces oil consumption by up to 40% compared to standard rectangular second rings, while still providing an effective gas seal.
Unlike conventional rings that rely solely on tension, the internal taper creates a dynamic wedge effect that improves conformability to worn cylinders. The 860123892 ring maintains consistent contact pressure even as the cylinder bore wears, preventing oil from bypassing into the combustion chamber. Field tests show that engines with this ring consume less than 0.05% of fuel as oil, extending top-up intervals.
The 860123892 ring is electroplated with a 0.10 mm layer of hard chromium, achieving a surface hardness of HV 750–900. This coating provides exceptional scuff resistance during break-in and long-term protection against abrasive wear from combustion soot. In accelerated wear tests, the chrome-plated ring showed only 0.005 mm radial wear after 5,000 hours, outperforming nitrided rings by 2:1.
The plating process includes micro-crack networks that retain oil, reducing friction by 15% compared to uncoated rings. The phosphate pre-coating on the ring body promotes rapid seating during the first 50 hours. XCMG’s quality control ensures that every 860123892 ring meets strict porosity and adhesion standards.
Rebuilding with genuine 860123892 internal tapered rings reduces oil consumption by up to 60% compared to worn rings. Lower oil carryover into the combustion chamber also reduces blue smoke and particulate emissions, helping older graders meet smoke opacity limits. Compression pressures stabilize, improving cold-start reliability and reducing cranking time.
Dynamometer tests on GR2003 engines showed a 3% improvement in fuel efficiency after installing new 860123892 rings, due to reduced friction and better gas sealing. The ring’s optimized tension (12–15 N) balances sealing with low parasitic loss. For fleet operators, the return on investment is typically less than 1,000 hours.
Before installing the 860123892 ring, verify the piston ring groove is clean and undamaged. The ring has a dot or marking indicating the top side – install with marking facing upward (toward cylinder head). Stagger end gaps 120° from the top ring and oil ring. Never use piston ring expanders on chrome-plated rings – hand-install carefully.
Measure end gap by inserting the ring squarely into the cylinder bore at the lowest wear position. Acceptable gap: 0.40–0.60 mm. If too tight, file the ends with a fine ring file. After installation, rotate the ring in the groove to ensure free movement. Lubricate with engine oil. During break-in, avoid prolonged idling; operate under moderate loads for the first 10 hours.
Counterfeit internal tapered rings often use plain gray iron with insufficient taper angle, leading to poor oil control and rapid wear. Some fakes lack the hard chrome plating, causing scuffing and ring sticking within 500 hours. Genuine 860123892 rings are manufactured in an IATF 16949 certified facility, with 100% inspection for taper angle, hardness, and plating adhesion. Each ring is laser-etched with the XCMG logo for traceability.
Using OEM rings preserves engine warranty and ensures compatibility with XCMG’s cylinder bore finish. The 860123892 also includes a protective oil coating to prevent rust. Don’t risk high oil consumption and cylinder glazing – choose genuine XCMG quality.
Internal taper design reduces oil burning by 40-60%.
HV 750-900, 2x longer life than nitrided rings.
Reduces blue smoke and particulate output.
Signs of a failed second compression ring include excessive oil consumption (more than 1 liter per 100 hours), blue exhaust smoke, and fouled injectors. A compression test may show normal readings because the top ring still seals, but a cylinder leakage test will reveal high blow-by past the second ring. Also, remove the oil fill cap – excessive vapor indicates ring wear.
When replacing rings, always hone the cylinder bore to restore cross-hatch (320 grit). Measure ring groove side clearance – if exceeds 0.10 mm, replace the piston. Never mix old and new rings. Always install a full set of rings (top, second, oil) for balanced performance. The 860123892 is sold individually; order six for a full engine set.
Store spare rings in original packaging, flat, away from moisture and UV light. Shelf life is 5 years. Before installation, verify the ring orientation marking. Installing the ring upside down will dramatically increase oil consumption.
XCMG’s global parts network stocks the 860123892 internal tapered ring in regional warehouses across North America, Europe, Asia, Middle East, and Africa. Typical lead time: 2-4 business days for air freight. Bulk orders (50+ pieces) qualify for sea freight discounts and custom packaging.
For fleet customers, we offer engine overhaul kits that include rings, bearings, gaskets, and liners. Contact our parts specialists via the buttons above to request a quote, technical drawing, or installation video. We also provide cylinder honing specifications and torque sequences for complete rebuilds.
*All specifications based on XCMG original equipment standards. Always replace rings as a full set. OEM number 860123892 is a registered XCMG component. Images are representative; actual product may vary.
For any inquiries regarding the 860123892 XCMG Internal Tapered Ring or other motor grader engine components, contact our team via the “Send Email” or “Inquiry Now” buttons above. We provide genuine parts, fast delivery, and expert technical support to keep your fleet operating reliably.
