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Precision-engineered water seal ring for wet cylinder liners – The OEM A3000-1002063B Cylinder Liner Water Seal Ring is manufactured from high-grade nitrile rubber (NBR) with a unique profile to provide a perfect seal between the cylinder liner and engine block coolant passages. Designed for SINOTRUK Homan heavy-duty engines, this seal prevents coolant leakage, cavitation, and liner vibration. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts. The A3000-1002063B water seal ring features a dual‑lip sealing profile, exceptional compression set resistance, and compatibility with modern coolants including OAT and hybrid formulations.
The A3000-1002063B water seal ring is a small but vital component in wet‑liner diesel engines. It seals the annular gap between the cylinder liner outer diameter and the cylinder block water jacket, preventing coolant from bypassing the liner or entering the crankcase.
A failed seal leads to coolant dilution of engine oil, corrosion of internal components, and potential liner cavitation. This SINOTRUK Homan genuine seal is engineered with a precise cross‑section and durometer to maintain sealing force even after thousands of thermal cycles.
Unlike generic O‑rings, the A3000-1002063B uses a specially compounded NBR rubber with exceptional resistance to glycol‑based coolants, high temperatures, and compressive creep.
Dual‑lip sealing profile with a rounded cross‑section ensures positive contact against both liner and block, preventing any coolant bypass even under pressure spikes.
NBR compound formulated for continuous operation at 110°C coolant temperature, with peaks up to 130°C without hardening or cracking.
After 1000 hours at 120°C under 25% compression, the A3000-1002063B retains over 85% of its original sealing force.
| OEM Number | A3000-1002063B |
| Product Name | Cylinder Liner Water Seal Ring (O‑ring Profile) |
| Brand | SINOTRUK Homan |
| Material | High‑grade Nitrile Butadiene Rubber (NBR) – 70 Shore A |
| Inner Diameter (Nominal) | 128.5 mm ±0.15 mm |
| Cross‑Section Diameter | 4.0 mm ±0.08 mm (circular profile) |
| Hardness (Shore A) | 70 ±5 |
| Tensile Strength | ≥ 12 MPa |
| Elongation at Break | ≥ 250% |
| Compression Set (ASTM D395, 100h/120°C) | ≤ 15% |
| Temperature Range (continuous) | -40°C to +125°C |
| Coolant Compatibility | Ethylene glycol, OAT, HOAT, water (pH 6‑9) |
| Applicable Engines | SINOTRUK Homan A3000 series, WD615, D10, D12 (wet liner) |
| Packaging Quantity | 6 rings per set (one per cylinder) or individually bagged |
| Standards | ISO 9001, IATF 16949, ASTM D2000 M2BG 710 |
The A3000-1002063B water seal ring is compression‑molded under tightly controlled conditions to ensure consistent cross‑section and absence of flash or voids. The NBR compound is specially formulated to resist coolant additives (including silicates and phosphates) that can degrade ordinary rubber.
The ring’s circular cross‑section is optimized for the groove geometry in the cylinder block. When the liner is pressed into place, the seal is compressed radially, creating an interference fit that remains leak‑tight even under dynamic liner movement caused by combustion forces.
Each batch is sampled for hardness, tensile strength, and compression set. The seal also undergoes a “coolant immersion test” (168 hours at 120°C in 50/50 glycol/water) with no measurable volume change greater than 5%.
Some aftermarket seals use cheap EPDM or silicone rubber that can swell or lose sealing force in hot coolant. The A3000-1002063B uses premium NBR with an acrylonitrile content of 33%, balancing oil resistance and low‑temperature flexibility.
This material also resists the formation of hard deposits (elastomer hardening) often seen in engines with inadequate coolant maintenance. In field tests, genuine SINOTRUK Homan seals showed no cracking or hardening after 10,000 hours of operation, whereas non‑genuine seals failed as early as 2,000 hours.
A properly sealed water jacket also dampens liner vibration, reducing cavitation erosion on the outer liner wall. The A3000-1002063B provides a consistent elastomeric cushion that absorbs micro‑vibrations, prolonging liner life.
Diesel engines are prone to cylinder liner cavitation pitting when coolant bubbles collapse on the liner surface. A good water seal ring helps maintain correct coolant velocity and prevents localized low‑pressure zones that promote cavitation.
Correct installation of the A3000-1002063B is essential to avoid leaks. Follow these steps: 1) Clean the seal groove in the cylinder block thoroughly; remove any old rubber, scale, or debris. 2) Inspect the groove for burrs or damage; lightly deburr if necessary.
3) Lubricate the seal ring with clean engine coolant (or a light water‑based lubricant). Never use petroleum‑based grease, as it may swell NBR temporarily. 4) Install the ring into the groove, ensuring it is not twisted. The ring should lay flat without stretching.
5) Before installing the cylinder liner, apply a thin film of coolant to the liner’s sealing area. 6) Press the liner straight down using a proper press tool; avoid cocking. 7) After liner installation, perform a coolant pressure test (1.5 bar) to verify no leakage past the seal.
During engine overhaul or liner replacement, always replace the water seal rings with new genuine parts. Never reuse old seals, as they have taken a permanent compression set. Inspect the cylinder block groove for fretting or pitting; repair if needed.
If the engine shows signs of coolant in oil (milky oil, rising oil level), suspect a failed water seal ring or liner crack. Pressure‑test the cooling system to pinpoint leakage. Using genuine A3000-1002063B seals reduces the risk of such failures.
Each batch of A3000-1002063B water seal rings is produced under IATF 16949 and ISO 9001 certified processes. Raw rubber compounds are tested for Mooney viscosity, curing characteristics, and tensile strength on a rheometer.
Finished rings are 100% visually inspected for surface defects. Sample rings from each cavity are subjected to dimensional measurement (ID, CS) using optical comparators, plus compression set and coolant immersion 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 bar at 110°C for 5000 cycles – no detectable leakage.
A major Chinese heavy‑truck fleet operating 800 SINOTRUK A3000 engines replaced all water seal rings with the A3000-1002063B after experiencing coolant loss issues. Over two years, coolant‑related failures dropped by 90%. No seal leaks were reported.
Another case: a power generation company with D12 engines noted that using genuine seals extended the time between liner overhauls from 8000 to 12,000 hours, directly reducing maintenance costs. The seals remained flexible and undamaged upon disassembly.
Each genuine A3000-1002063B water seal ring is individually packed in a sealed polybag with a label showing the OEM number, batch code, and a holographic authenticity sticker with a QR code. Scanning the QR code redirects to the SINOTRUK Homan verification portal.
Counterfeit seals often have irregular cross‑sections, wrong hardness (too soft or hard), or are made from recycled rubber that hardens quickly. Always purchase from authorized distributors to ensure genuine SINOTRUK Homan quality and warranty.
Summary: The SINOTRUK Homan Cylinder Liner Water Seal Ring (OEM A3000-1002063B) provides reliable, long‑lasting sealing for wet liner diesel engines. Choose genuine OEM for leak‑free cooling, reduced cavitation, and extended engine life.
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