MERCURY 78439 Cylinder Power Tilt Hoses

( Manufacturer Part Number: 78439 ), ( Part Type: Cylinder Hose )

Review MERCURY Trim Cylinder Power Tilt Hoses Parts

The **Mercury 78439 Cylinder Power Tilt Hoses** are a premium, high-performance hydraulic component meticulously engineered to deliver unmatched reliability and precision in marine and outdoor power equipment applications. Designed specifically for Mercury outboard engines, these heavy-duty tilt hoses are crafted from superior-grade, oil-resistant synthetic rubber with a reinforced, abrasion-resistant outer cover, ensuring exceptional durability against the harshest conditions whether exposed to saltwater corrosion, UV degradation, or constant flexing during operation. The hoses feature a robust, braided steel wire reinforcement core, which provides superior resistance to kinking, crushing, and high-pressure fluctuations, thereby extending the operational lifespan of your engine s tilt mechanism. Engineered to meet or exceed OEM specifications, these hoses maintain optimal hydraulic flow while minimizing internal leakage, ensuring smooth and responsive tilt functionality for effortless handling of your boat or equipment. Their seamless, smooth-bore design further reduces friction and wear, contributing to quieter operation and enhanced efficiency. Whether used in recreational fishing boats, performance outboards, or commercial marine applications, the **Mercury 78439 Cylinder Power Tilt Hoses** offer a perfect balance of strength, flexibility, and longevity, making them an indispensable upgrade for any marine enthusiast seeking peak performance and long-term reliability.

**Pros and Cons of Buying Mercury 78439 Cylinder Power Tilt Hoses**

The **Mercury 78439** is a cylinder power tilt hose assembly designed for Mercury outboard motors, particularly those with tilt-and-sliding mechanisms. Below is a detailed breakdown of its advantages and disadvantages.

### **Pros**

1. **Compatibility and Fit**

- Specifically engineered for Mercury outboards, ensuring a precise fit without modifications. This reduces the risk of leaks or improper function.

- Designed to work seamlessly with the motor s tilt mechanism, providing smooth operation.

2. **Durability and Quality**

- Mercury is a well-known brand in marine propulsion, and their hoses are typically constructed from high-quality materials resistant to oil, fuel, and environmental degradation.

- Reinforced with braided or woven fibers to withstand pressure and prevent kinking or bursting over time.

3. **Ease of Installation**

- Designed as a direct replacement, making installation straightforward for mechanics or DIY enthusiasts with basic tools. No complex adjustments are usually required.

- Often comes with clear instructions or part numbers for easy identification during replacement.

4. **Performance Reliability**

- A properly functioning tilt hose ensures smooth and consistent operation of the motor s tilt mechanism, reducing strain on the motor and improving longevity.

- Prevents leaks that could contaminate the engine bay or damage surrounding components.

5. **Warranty and Support**

- Mercury products often come with manufacturer warranties, providing recourse if the hose fails prematurely due to defects.

- Access to genuine parts ensures compatibility with Mercury s diagnostic and repair systems.

6. **Cost-Effective Replacement**

- While not the cheapest option, it is a reliable long-term solution compared to aftermarket hoses that may fail sooner or lack proper sealing.

- Avoids potential damage to the tilt mechanism or motor from inferior hoses, saving on costly repairs later.

---

### **Cons**

1. **Higher Cost**

- Genuine Mercury parts are typically more expensive than aftermarket alternatives. This may be a barrier for budget-conscious buyers.

- Pricing can vary based on dealer markups or regional availability.

2. **Limited Availability**

- Depending on location, finding the exact part number (78439) may require ordering from Mercury dealers, authorized distributors, or online retailers, which could involve shipping delays.

- Some smaller marine supply stores may not stock Mercury-specific parts, requiring special ordering.

3. **Potential Overkill for Minor Issues**

- If the hose failure is isolated to a small section (e.g., a cracked section rather than the entire assembly), replacing the entire cylinder power tilt hose may be unnecessary. In such cases, a partial replacement or repair might suffice.

- Over-replacement could lead to unnecessary expenses if the issue is elsewhere (e.g., a worn-out tilt mechanism or damaged seals).

4. **Installation Complexity for Untrained Users**

- While designed for easy replacement, improper handling during installation (e.g., over-tightening, misalignment) could damage the hose or adjacent components. This risk is higher for those without mechanical experience.

- May require disassembling parts of the motor or tilt mechanism, which could be time-consuming.

5. **Environmental and Storage Considerations**

- Hoses exposed to UV light, extreme temperatures, or saltwater over time may degrade faster, even if initially high-quality. Proper storage and maintenance are essential.

- If stored improperly (e.g., coiled tightly or in direct sunlight), the hose could become brittle or kinked before installation.

6. **Dependence on Brand Loyalty**

- Some boat owners prefer aftermarket brands for cost savings or perceived innovation, viewing Mercury as a "safe but expensive" choice. This could lead to hesitation in purchasing genuine parts.

---

### **Conclusion**

The **Mercury 78439 cylinder power tilt hose** is a **reliable, high-quality replacement part** that ensures compatibility, durability, and smooth operation for Mercury outboards. Its advantages such as precise fit, ease of installation, and manufacturer support make it an ideal choice for those prioritizing performance and longevity. However, the **higher cost and potential over-replacement risks** may deter budget-conscious buyers or those seeking quick, low-cost fixes.

For most boat owners who value **long-term reliability and compatibility**, the Mercury part is the **best recommendation**. It minimizes the risk of leaks, mechanical failures, or voiding warranties associated with aftermarket alternatives. If cost is a major concern, a **thorough inspection** to confirm the exact issue (e.g., whether the entire hose or just a section needs replacement) could help justify the investment. Additionally, purchasing from an **authorized dealer** ensures authenticity and warranty coverage.

- You own a Mercury outboard and need a **direct, high-quality replacement**.

- You prioritize **durability, ease of installation, and manufacturer support**.

- You are willing to pay a premium for **reliability and compatibility**.

- You have **verified the exact issue** and are confident a partial replacement would suffice.

- You are on a **tight budget** and can accept the risk of potential compatibility or longevity issues.

- You are comfortable with **DIY repairs** and have access to detailed installation guides.

Details:

TRIM CYLINDER 78439 power trim tilt Mercury with hoses - for parts I'm listing it as parts/ not working. I observed some scratches in places your engine might bolt onto, but I'm not certain its going to be a problem at all. But it works fine. Also the hoses bend in a cramp places just due to way I wrapped/ looped them for pictures.

part #: 78439 prices

• $57.39-$129.00

specifications ouboaen:

• for makes: Mercury
• mpn: 78439
• part type: Cylinder Hose

seller ouboaen:

• # reviews: 10
• rating: 100.0%
• city: Jacksonville, Florida

shipping ouboaen:

• class: Expedited
• service: USPS Priority Mail
• carrier: USPS
• cost: $0.00
• transit: 4-10 Days
• type: Calculated

returns ouboaen:

• paid by: Buyer
• policy: Returns Accepted
• time: 30 Days

payments ouboaen:

• credit card: Visa
• other
• wallet: Google-pay

general ouboaen:

• condition: For parts or not working
• Boat Parts > Outboard Engines Components > Other

offer ouboaen:

• availability: In Stock
• best offers: True
• started: March 17, 2026
• sold: 0
• options: Ship-to-home
• quantity: 1

Mercury 78439 Is Similar To:

• 000124 Mercury Nla Extention For Strokes Out Of Kit (33.9% similar) ...(October 13th, 2018)
• 00820al Tecnoseal New Trim Plate Anode Aluminum Flat Mercury Alpha (17.3% similar) New tensely trim plate anode - aluminum flat mercury alpha f engines for material: pounds. 19 lbs kg: 0,080 kg height...(February 3rd, 2019)
• 10-96930a1 Mercury Mariner Tilt Lock Bolt Power Trim 745061221727 (39.7% similar) This mariner power trim bolt fits many mercury outboard motors from with hp engines. This bolt is whats used to change the position of outboard motor by inserting into holes on transom brackets. The part numbers for bolt are 10-96930A1 and 96930A1. There is no damage or corrosion. It is approx...(December 29th, 2018)
• 100-47-14 2720-881054t3 2720-881054t10 881054t Mercury Hp Optimax Power Rebuild Kit Size (33.6% similar) Piston OE 881054T3, 2720-881054T10, 881054T10, 881054T3OVAL pocket single roller mains make model cc HPYEARMERCURY6 cyl bore 3l OPTIMAX2502006MERCURY6 over size only includes:six brand new high quality Sm pistons, rings, pins and clips, complete gasket kit, upper, lower main crank bearings, 6 each ...(April 16th, 2018)
• 10238367 Mercury Outboard Cylinder Head Block Water Jacket Cover (44.8% similar) Used cover from a 1978 mercury 115 horsepower 6 cylinder outboard boat motor...(February 1st, 2019)
• 11273 1 Mercury Primer Lever For Outboard Motors (45.9% similar) Part number fits various 6 to 25 hp motors. For sale is a new primer lever the carburetor of mercury outboard motor...(April 29th, 2018)
• 114-7452k Cdi Switch Box For Mercury Marine Outboard Two Cylinder Used (33.6% similar) CID 114-7452K 1 switch box for mercury marine outboard two cylinder used. Please scroll down for large photos. Please for shipping quote. Shipping quotes are for the USA lower 48 states only. This is a used shelf spare. This offer is for a CID 114-7452K 1 switch box mercury marine outboard two ...(September 4th, 2018)
• 1200-8m0083452 Mercury Quicksilver Fuel Tank Gallon Red For Pontoon Boat (39.1% similar) Does have a few minor signs of wear including scuffs on bottom and warning label reinforced with tape. 6 gallon red fuel tank. Its ready to cruise. Part 8M0083452 tank is in fantastic shape garage kept. Owner was very meticulous about equipment and proper maintenance...(October 6th, 2018)
• 12180 Glm Water Pump Impeller Kit For Mercury Hp Outboard Rplc (21.1% similar) Shipping for us. Torn, broken, written on, greasy finger prints, etc. Under no circumstances will we falsify or undervalue export declared value documents. Note: ups cannot deliver to a PO. Please feel free to with any questions about combined shipping. Calculated shipping uses calculator. Priority ...(February 27th, 2019)
• 125elpto Mercury Outboard Hp With Yr Warranty (37.7% similar) They did a very good job re-rigging and setting up the new smart gauges controls. Milford, NJ I bought a hp rebuilt Johnson from you, 1-1 2 years later this motor runs like brand new one. Everyone there had a part to play and played it perfectly like well oiled outboard. Everything is working ...(October 31st, 2018)
• 12601 Mercury For Stud Nip (29.9% similar) ...(April 13th, 2018)