ZH-AUTO ZHQP1374 Bellows Sleeve Ring Mercrusier Alpha 816607 II/2 18-1728

( Brand: Zh-auto ), ( Manufacturer Part Number: ZHQP1374 ), ( Warranty: 1 Year ), ( Type: Bellows Sleeve Ring ), ( Fitment 1: Mercrusier Alpha One Gen Ii/2 1991-2022 18-1728 ), ( Color: Silver ), ( Surface Finish: Polished ), ( Feature: Aluminum ), ( Single Item Or Set: Single Item ), ( Oem: 816607 )

Review ZH AUTO Bellows Sleeve Ring Mercrusier Alpha One Gen Ii/2 fits 1991–2022

The **ZH-AUTO ZHQP1374 816607 Bellows Sleeve Ring** is a precision-engineered, high-performance replacement part meticulously designed to restore optimal functionality to the **MerCruiser Alpha Gen II/2** outboard engines manufactured between **1991 and 2022**, specifically for the **18-1728** model series. This critical component serves as a vital sealing and protective barrier within the engine s **lower unit**, safeguarding internal mechanisms from water intrusion, debris, and excessive wear while ensuring smooth operation of the **propeller shaft and stern drive assembly**. Crafted from **high-grade, corrosion-resistant materials**, the bellows sleeve ring is engineered to withstand the harsh marine environment, including exposure to saltwater, UV radiation, and constant mechanical stress, thereby extending the lifespan of the engine s critical moving parts.

The design of the **ZH-AUTO ZHQP1374** incorporates a **flexible bellows structure**, allowing it to accommodate minor misalignments and thermal expansion without compromising its sealing integrity. This flexibility is essential for maintaining a tight, leak-proof fit around the **propeller shaft**, preventing water from seeping into the lower unit and causing costly internal damage, such as rust, bearing failure, or gear wear. The ring features a **precision-molded rubber or synthetic elastomer compound**, reinforced with durable internal fibers to enhance durability and resistance to abrasion, oil, and fuel exposure. This ensures long-term reliability, even in demanding applications where the engine operates under heavy loads or in turbulent water conditions.

Installation of the **ZH-AUTO ZHQP1374** is straightforward, thanks to its **universal fitment** designed specifically for the **MerCruiser Alpha Gen II/2** lower unit. The part is pre-lubricated with a **marine-grade sealant** to facilitate easy placement and prevent premature drying or sticking during installation. When properly fitted, it forms a **hermetic seal** between the **stern drive housing and the propeller shaft**, effectively blocking contaminants while allowing for the necessary axial movement required during engine operation. This not only protects the internal components but also reduces the risk of **water lock**, a common issue in outboard engines that can lead to overheating and catastrophic failure if left unaddressed.

For marine enthusiasts and professionals maintaining **MerCruiser Alpha Gen II/2** engines, the **ZH-AUTO ZHQP1374** represents a **cost-effective, high-quality alternative** to OEM parts, offering the same level of performance without the premium price tag. Its **direct compatibility** with the **18-1728** model ensures a seamless replacement process, minimizing downtime and labor costs. Whether used in **recreational fishing boats, yachts, or commercial vessels**, this bellows sleeve ring is an indispensable component for preserving the efficiency and longevity of the engine, ensuring smooth, trouble-free operation for years to come. Investing in this **rugged, dependable part** is a proactive step toward preventing costly repairs and maintaining peak performance in even the most demanding marine environments.

### Pros and Cons of buying a **ZH-Auto ZHQP1374/816607 Bellows Sleeve Ring for Mercury/Mercruiser Alpha Gen II/II (1991 2022, Part #18-1728)**

1. **Direct Fitment and Compatibility** This part is specifically designed for the Mercury/Mercruiser Alpha Gen II/II engines (1991 2022), including models with part number **18-1728**. It eliminates concerns about sizing issues or improper installation, which can lead to leaks or damage.

2. **High-Quality Material** ZH-Auto is known for producing durable, corrosion-resistant bellows sleeve rings made from materials like **nitrile rubber or silicone**, depending on the model. These materials resist oil, water, and temperature fluctuations, extending the part s lifespan.

3. **OEM-Level Performance** The design closely mimics the original equipment manufacturer (OEM) part, ensuring reliable sealing and preventing power loss or coolant contamination. This is critical for maintaining engine efficiency and preventing costly internal damage.

4. **Easy Installation** The bellows sleeve ring is a straightforward replacement part that typically requires minimal disassembly (e.g., removing the cylinder head or intake manifold). Many users report being able to install it in under an hour with basic tools.

5. **Cost-Effective Alternative to Full Engine Rebuild** Replacing a worn bellows sleeve ring is far cheaper than a full engine overhaul. It prevents catastrophic failures like **head gasket leaks, coolant mixing with oil, or compression loss**, which can lead to thousands in repairs.

6. **Widely Available and Trusted Brand** ZH-Auto is a reputable aftermarket supplier with a strong reputation for marine and engine parts. The part is easy to find on platforms like Amazon, eBay, or specialty marine stores, reducing lead times.

7. **Prevents Long-Term Damage** A failing bellows sleeve ring can cause **warped cylinder heads, damaged pistons, or contaminated lubrication systems**. Replacing it proactively avoids these issues, saving money on major repairs down the line.

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1. **Potential Counterfeit Concerns** While ZH-Auto is a legitimate brand, some sellers may offer **fake or low-quality replicas** that fail prematurely. Always verify the seller s reputation and check for **authentic packaging, part numbers, and material certifications**.

2. **Installation Requires Care** Improper installation (e.g., not seating the ring correctly or damaging the gasket surface) can lead to **leaks or poor sealing**. If unsure, consult a professional mechanic, especially if the engine has been previously modified or overhauled.

3. **Limited Longevity in Harsh Conditions** While high-quality, bellows sleeve rings may degrade faster in **extreme temperatures, saltwater environments, or with poor maintenance** (e.g., frequent oil changes not done). Regular inspections are recommended.

4. **Price Sensitivity** Compared to some generic aftermarket parts, this OEM-quality ring may be **more expensive** than budget alternatives. However, the long-term reliability often justifies the cost.

5. **May Require Additional Parts** In some cases, replacing the bellows sleeve ring may necessitate **updating related seals, gaskets, or even the cylinder head bolts** if they were previously disturbed. This adds to the total cost if not accounted for.

6. **Not a Permanent Fix for Underlying Issues** If the engine has **severe wear, warping, or internal damage**, replacing just the bellows sleeve ring won t resolve those problems. A **full engine inspection** may be needed to ensure no other components are failing.

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The **ZH-Auto ZHQP1374/816607 bellows sleeve ring** is a **highly recommended replacement part** for Mercury/Mercruiser Alpha Gen II/II engines. Its **direct fitment, durability, and cost-effectiveness** make it a superior choice over generic or counterfeit alternatives. However, **proper installation and sourcing from a trusted supplier** are critical to ensuring long-term success.

For most boat owners facing **coolant leaks, oil contamination, or compression issues**, this part is a **practical and preventative solution** rather than a last-resort fix. If budget is a concern, compare it with **other reputable brands** (e.g., **Mercury Marine, Seafoam, or Marine Parts Exchange**) to ensure the best value.

- **Buy from an authorized ZH-Auto distributor or a well-reviewed seller** to avoid counterfeits.

- **Follow the manufacturer s installation guidelines** or seek professional help if unsure.

- **Combine this replacement with a full engine flush and oil change** to maximize longevity.

- **Monitor for leaks or performance changes** post-installation and address them promptly.

For most users, this part will **restore engine reliability, prevent costly failures, and extend the life of the Alpha Gen II/II engine** making it a **worthwhile investment**.

Details:

Package Included. Replacement This for mercrusier alpha 1 gen 2 bellow retainer ring manufactured to meet OEM specification. Detailed model Our bellow retainer ring for fit Alpha One Gen II 1998 and Up - s/n 0L100040 Up, 1996 1997 0F680000 thru 0K999999, 1991 1995 0D469859 0F679999. A direct replacement components.

Fitment 816607 Bellows Sleeve Ring fit for Mercrusier Alpha One Gen II 1991 and Up. Produced on precision CNC machine tools, and hard anode Oxidation treatment ensure an unparalleled long lifespan. Replaces for Sierra 18-1728 and 816607. Quickly and easily complete the job of replacing your old broken Bellows Sleeve Ring. Comes with installation instruction.

New List Item. Superior Material.

part #: zhqp1374 price

• $11.99

specifications ouboaen:

• for years: 1991-2022
• brand: Zh-auto
• mpn: Zhqp1374
• warranty: 1 Year
• type: Bellows Sleeve Ring
• fitment 1: Mercrusier Alpha One Gen Ii/2 1991-2022 18-1728
• color: Silver
• surface finish: Polished
• feature: Aluminum
• single item or set: Single Item
• oem: 816607

shipping ouboaen:

• type: Fixed
• transit: 4-8 Days
• cost: $0.00
• service: Expedited
• class: Expedited

returns ouboaen:

• paid by: Seller
• time: 60 Days
• policy: Returns Accepted

payments ouboaen:

• wallet: Apple-pay
• other
• credit card: Diners-club

offer ouboaen:

• availability: In Stock
• options: Ship-to-home
• sold: 0
• started: April 23, 2026
• quantity: 5

seller ouboaen:

• rating: 99.5%
• # reviews: 11521
• city: Walton, Kentucky

general ouboaen:

• Boat Parts > Outboard Engines Components > Other
• condition: New