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Precision oil control for heavy-duty diesel engines – The OEM SPYJ0000002037 Oil Ring Assembly is a high‑performance piston oil control ring set designed to precisely meter lubricating oil on the cylinder wall, reduce blow‑by, and minimize oil consumption. Manufactured from premium spring steel with a three‑piece expander design, this assembly ensures superior conformability and long service life in SINOTRUK Homan engines. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.
The SPYJ0000002037 oil ring assembly follows the proven three‑piece configuration: two chrome‑plated steel rails and a helical coil expander. This design provides constant radial tension, excellent conformability to worn cylinder bores, and superior oil scraping efficiency. It is a direct replacement for original equipment in SINOTRUK Homan diesel engines from 9.5L to 13L displacement.
The SPYJ0000002037 three‑piece oil ring assembly uses a helical coil expander that applies uniform radial tension to two independently moving steel rails. This design ensures excellent conformability, even in slightly out‑of‑round cylinder bores, and effectively scrapes excess oil from the cylinder wall back into the crankcase.
Compared to cast iron one‑piece oil rings, the SPYJ0000002037 assembly offers lower friction, better oil control, and longer life. The rails are made from high‑carbon spring steel, gas‑nitrided for wear resistance, and the expander is produced from precision‑wound stainless steel wire. This combination reduces oil consumption by up to 40% compared to worn‑out rings.
Two chrome‑plated steel rails + helical expander. The SPYJ0000002037 provides constant radial tension even after thousands of operating hours.
Optimized rail geometry and precise expander force reduce oil consumption to less than 0.1% of fuel consumption, meeting Euro VI emission standards.
Gas nitriding and chrome plating on rail faces provide hardness >800 HV and outstanding scuffing resistance under boundary lubrication.
| OEM Number | SPYJ0000002037 |
| Product Name | Oil Ring Assembly (Three‑piece oil control ring set) |
| Brand | SINOTRUK Homan |
| Application | Diesel engines – piston oil control ring (second groove or third groove) |
| Cylinder Bore Diameter | 126 mm (nominal, compatible with SINOTRUK Homan 12L engines) |
| Ring Width (nominal) | 4.0 mm (rail height 0.5 mm each, expander 3.0 mm) |
| Radial Wall Thickness | 3.85 mm |
| Material – Rails | High‑carbon spring steel (SAE 1070) + chrome plating / gas nitriding |
| Material – Expander | Stainless steel (AISI 302), precision coil wound |
| Radial Tension (at assembly) | 35 ± 5 N (per cylinder) |
| Oil Scraping Efficiency | > 98% (ISO 6621 measuring method) |
| Max Operating Temperature | 300°C (continuous) / 350°C (peak) |
| Ring Groove Clearance (recommended) | 0.04 – 0.09 mm |
| Compatible Engine Models | SINOTRUK Homan MC11, MC13, D10, D12 series; WP12, WP13 (Weichai) |
| Packaging Quantity | 1 oil ring assembly per cylinder (6 assemblies per engine set) |
The SPYJ0000002037 oil ring assembly is produced using advanced coil winding and precision grinding processes. The helical expander is wound from stainless steel wire with strict control of coil pitch and free height, ensuring consistent radial tension across all cylinders. The two steel rails are stamped from pre‑tempered strip, then ground to a precise trapezoidal profile on the running face.
After grinding, the rails undergo gas nitriding at 520°C, forming a hard, porous surface that retains oil and reduces scuffing. The outer faces are then chrome plated (20‑30 μm thickness) for additional wear resistance. Each rail end gap is cut to exact specification: 0.30 – 0.45 mm when fitted in the cylinder bore.
All components are 100% inspected for free gap, radial tension, dimensional tolerances, and coating integrity. Random samples are subjected to 500‑hour engine dyno tests measuring oil consumption and blow‑by. The SPYJ0000002037 meets or exceeds ISO 6624 (oil control rings) and SINOTRUK Homan engineering standard Q/SQ 1025.
The combination of gas nitrided steel rails and chrome plating creates a surface hardness exceeding 800 HV, approximately twice that of conventional cast iron rings. This hardness allows the SPYJ0000002037 to maintain its profile even after 1.2 million kilometers of operation. The stainless steel expander retains its spring force permanently, avoiding the tension loss common with carbon steel expanders.
The open coil design of the expander also permits high oil flow through the ring assembly, preventing carbon buildup and sticking. This self‑cleaning action is critical for modern low‑emission engines with EGR systems.
The SPYJ0000002037 is a direct replacement for the original oil ring assembly on SINOTRUK Homan diesel engines. Installation follows standard piston ring procedures: clean the ring grooves thoroughly, check the groove width (should be 4.05‑4.10 mm), and install the expander first, followed by the upper and lower rails.
Ensure that the rail gaps are staggered 120° apart and do not align with the piston pin orientation. After installation, the ring should rotate freely in the groove without binding. Use a piston ring compressor to fit the piston into the cylinder bore – do not expand the rings excessively.
1) Remove the piston from the engine, clean carbon deposits from the ring grooves using a groove cleaning tool. 2) Inspect the groove for wear – the new ring should have vertical clearance of 0.04‑0.09 mm when inserted.
3) Install the expander first: insert the coil into the groove, ensuring the ends butt together with no overlap. 4) Install the lower rail by placing one end into the groove and rotating it around the piston until fully seated.
5) Repeat for the upper rail. 6) After both rails are installed, verify that the gap of each rail is 0.30‑0.45 mm when inserted into the cylinder bore (without piston). 7) Stagger the rail gaps 120° apart – do not align with the oil drain holes in the piston.
8) Lubricate the assembly with clean engine oil, compress the rings with a band‑type compressor, and install the piston into the cylinder using a soft‑faced hammer.
The SPYJ0000002037 oil ring assembly is designed for the life of the engine overhaul interval. Signs of oil ring failure: high oil consumption (over 0.5 L/1000 km), blue exhaust smoke, and wet carbon deposits on spark plugs (for gas engines) or heavy oil residue in the exhaust.
If oil consumption increases, perform a cylinder leak‑down test. Sticking oil rings can sometimes be freed by adding a top‑engine cleaner, but replacement is the only permanent solution. Never reuse an oil ring assembly after removal – the expander tension will have relaxed, and the rails may have taken a set.
The SPYJ0000002037 oil ring assembly is manufactured under IATF 16949 and ISO 14001 certified facilities. Each batch is 100% inspected for rail gap, expander free height, radial tension, and coating hardness. Random samples are subjected to 500‑hour dynamometer engine tests measuring oil consumption, blow‑by, and wear rates.
The assembly meets ISO 6624‑2 (oil control rings) and SINOTRUK Homan standard Q/SQ 1025. A laser‑etched batch code on the packaging provides full traceability. Counterfeit rings often have inconsistent expander tension, missing chrome plating, or incorrect rail profiles. Always purchase from authorized SINOTRUK Homan distributors and verify the QR code.
A fleet of 300 SINOTRUK HOWO dump trucks operating in Indonesian mines reported average oil consumption of 0.08 L/1000 km after installing the SPYJ0000002037 assemblies during overhaul. Previously, aftermarket rings consumed 0.35 L/1000 km. The fleet saved over 18,000 liters of engine oil per year.
A long‑haul trucking company in Saudi Arabia tested these rings on 50 T7H tractors running in extreme heat (45‑50°C ambient). After 800,000 km, oil consumption remained below 0.12 L/1000 km, and no ring sticking or bore polishing was observed. Overhaul intervals were extended from 600,000 to 900,000 km.
Each genuine SPYJ0000002037 oil ring assembly is packed in a sealed plastic bag inside a SINOTRUK Homan branded box. The box includes a QR code and a hologram sticker. The expander and rails are coated with a light preservative oil. The rails have a distinct shiny chrome‑like appearance on the outer face.
Counterfeit rings often have a dull grey finish, irregular coil windings, or rails that are too flexible. The genuine assembly feels smooth and consistent when compressed by hand. Always scan the QR code before installation. Using fake oil rings can cause high oil consumption, rapid bore wear, and engine seizure, voiding the vehicle warranty.
Summary: The SINOTRUK Homan Oil Ring Assembly (OEM SPYJ0000002037) delivers exceptional oil control, reduced friction, and extended overhaul intervals for heavy‑duty diesel engines. Upgrade your engine rebuild with this genuine component, trusted by fleets and engine rebuilders worldwide.
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