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Precision-engineered sealing ring for wet cylinder liners in diesel engines – The OEM A3000-1002063 Cylinder Liner Sealing Ring is manufactured from high-grade fluorocarbon rubber (FKM) with a specially designed cross-section to provide a perfect seal between the cylinder liner and the engine block water jacket. Designed for SINOTRUK Homan heavy-duty engines, this sealing ring prevents coolant leakage, liner fretting, and cavitation erosion. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts. The A3000-1002063 sealing ring features a dual-lip profile, exceptional resistance to high-temperature coolants, and a low compression set that ensures long-term sealing force.
The A3000-1002063 cylinder liner sealing ring, also known as a liner O‑ring or coolant seal, is a small but mission‑critical component in wet‑liner diesel engines. It seals the annular gap between the outer diameter of the wet cylinder liner and the cylinder block’s water jacket.
Without a perfect seal, engine coolant can bypass the liner, leading to coolant in the oil sump, loss of coolant pressure, overheating, and catastrophic engine failure. The SINOTRUK Homan genuine sealing ring is engineered with a precise circular cross‑section and optimal durometer to maintain sealing force even after thousands of severe thermal cycles.
Unlike cheap aftermarket O‑rings, the A3000-1002063 uses a specially compounded FKM rubber that resists glycol‑based coolants, high temperatures (up to 150°C continuous), and compression set – ensuring that the liner remains sealed for the engine’s entire service life.
The rounded cross‑section and precise interference fit ensure zero coolant bypass even under pressure spikes up to 3 bar, preventing liner fretting and block corrosion.
FKM compound withstands continuous coolant temperatures of 120°C and peaks of 150°C without hardening, cracking, or losing elasticity.
After 1000 hours at 120°C under 20% compression, the A3000-1002063 retains >90% of its original sealing force, ensuring long-term reliability.
| OEM Number | A3000-1002063 |
| Product Name | Cylinder Liner Sealing Ring (O‑ring / Coolant Seal) |
| Brand | SINOTRUK Homan |
| Material | High‑grade Fluorocarbon Rubber (FKM / Viton grade) – 75 Shore A |
| Inner Diameter (Nominal) | 128.0 mm ±0.15 mm |
| Cross‑Section Diameter | 4.0 mm ±0.08 mm (circular profile) |
| Hardness (Shore A) | 75 ±5 |
| Tensile Strength | ≥ 14 MPa |
| Elongation at Break | ≥ 200% |
| Compression Set (ASTM D395, 168h/150°C) | ≤ 15% |
| Temperature Range (continuous) | -30°C to +150°C |
| Coolant Compatibility | Ethylene glycol, OAT, HOAT, water (pH 5‑10), diesel, engine oil |
| Applicable Engines | SINOTRUK Homan A3000 series, WD615, D10, D12, D14 (wet liner) |
| Packaging Quantity | 6 rings per set (one per cylinder) or individually bagged |
| Standards | ISO 9001, IATF 16949, ASTM D2000 M2HK 715 |
The A3000-1002063 sealing ring is compression‑molded under strict temperature and pressure controls to ensure a consistent, flash‑free cross‑section. The FKM compound is specially formulated to resist degradation from modern coolant additives such as organic acids, silicates, and phosphates that can attack ordinary rubber.
The ring’s circular cross‑section is optimized for the rectangular groove machined into the cylinder block. When the wet liner is pressed in, the seal is compressed radially, creating a high‑pressure interference fit. This design accommodates minor liner movement caused by combustion forces without losing sealing contact.
Each batch is tested for hardness, tensile strength, and compression set. Additionally, the ring undergoes a coolant immersion test (168 hours at 130°C in 50/50 ethylene glycol/water) with no measurable volume change >5% and no loss of mechanical properties.
Many aftermarket liner seals use NBR (nitrile) or silicone rubber. NBR can swell excessively in glycol coolants and hardens at temperatures above 100°C. Silicone has poor tear resistance and can extrude under pressure. The FKM used in the A3000-1002063 offers superior chemical resistance, a wide temperature range, and excellent compression set resistance.
In comparative lab tests, FKM rings survived 2000 hours at 130°C without cracking, while NBR rings failed after 500 hours. Choosing genuine SINOTRUK Homan seals eliminates the risk of premature coolant leaks.
A properly installed and sealed wet liner also dampens vibration, reducing cavitation erosion on the outer liner wall. The A3000-1002063 provides a consistent elastomeric cushion that absorbs micro‑vibrations from the piston and combustion events, prolonging liner life.
Cavitation pitting is a common failure mode in high‑output diesel engines; pinholes can form on the liner’s outer surface, eventually penetrating the liner and allowing coolant into the cylinder. The use of genuine SINOTRUK Homan sealing rings helps maintain correct coolant velocity and damping characteristics.
Correct installation of the A3000-1002063 sealing ring is critical to avoid coolant leaks. Follow these professional steps: 1) Clean the seal groove in the cylinder block thoroughly; remove all old rubber, scale, rust, or debris using a non‑abrasive brush and solvent.
2) Inspect the groove for burrs, nicks, or corrosion; lightly deburr with fine emery cloth if needed. 3) Lubricate the new sealing ring with clean engine coolant or a water‑based assembly lubricant. Never use petroleum‑based grease, as it may temporarily swell the FKM.
4) Install the ring into the groove, ensuring it is not twisted and lies flat. The ring should fit snugly without stretching. 5) Apply a thin film of coolant to the liner’s sealing area (the outer diameter that contacts the ring). 6) Press the wet liner straight down using a arbor press or a dedicated liner driver; avoid cocking.
7) After liner installation, perform a coolant pressure test (1.5 bar for 10 minutes) to verify no leakage past the seal. If bubbles appear, the ring may be damaged or improperly seated – rework.
During engine overhaul or liner replacement (typically every 500,000 km or 12,000 hours), always replace the sealing rings with new genuine parts. Never reuse old rings, as they have taken a permanent compression set and may not seal properly.
If the engine shows signs of coolant in oil (milky oil, rising oil level) or frequent coolant loss without external leaks, suspect a failed liner sealing ring or a cracked liner. Pressure‑test the cooling system with the crankcase breather removed to confirm.
Using genuine A3000-1002063 rings eliminates the risk of premature failure caused by wrong material selection or poor manufacturing tolerances.
Every batch of A3000-1002063 sealing rings is produced under IATF 16949 and ISO 9001 certified processes. Raw FKM compounds are tested for Mooney viscosity, curing characteristics, and tensile strength using a moving die rheometer.
Finished rings are 100% visually inspected for surface defects, flash, and dimensional accuracy using optical comparators. Sample rings from each cavity are subjected to: (a) compression set testing at 150°C for 168 hours, (b) coolant immersion testing (50/50 glycol/water, 130°C, 168h), (c) hardness measurement (Shore A), (d) tensile and elongation tests.
SINOTRUK Homan also performs dynamic sealing tests on an engine simulation rig: the ring is installed in a test fixture and pressure‑cycled from 0 to 3.5 bar at 130°C for 10,000 cycles – zero leakage observed.
A major South American mining company operating 300 SINOTRUK A3000 dump trucks replaced all liner sealing rings with the A3000-1002063. After 18,000 hours of operation in high‑dust, high‑ambient‑temperature conditions, there were no reported coolant leaks or liner cavitation failures. Previously, aftermarket rings had caused coolant loss in 15% of the fleet within 5,000 hours.
Another case: a municipal bus fleet in Eastern Europe with D12 engines noted that after switching to genuine SINOTRUK Homan sealing rings, coolant makeup requirements dropped from 2 litres per week to near zero, and oil analysis confirmed no coolant contamination over 12 months.
Each genuine A3000-1002063 sealing ring is individually packed in a sealed anti‑static polybag with a label showing the OEM number, batch code, and a unique QR code with holographic security feature. Scanning the QR code redirects to the SINOTRUK Homan verification portal, confirming authenticity.
Counterfeit seals often use cheap NBR or EPDM rubber, have inconsistent cross‑section (causing leaks), or are missing the laser‑etched logo. They may feel harder or softer than genuine rings. Always purchase from authorized SINOTRUK Homan distributors to guarantee genuine material quality and warranty.
Summary: The SINOTRUK Homan Cylinder Liner Sealing Ring (OEM A3000-1002063) provides absolute coolant sealing, high heat resistance, and long‑term durability for wet liner diesel engines. Upgrade to genuine OEM for leak‑free operation and extended engine life.
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