OMC Outboard Midsection Exhaust Housing 0436192 0395157 25HP

( Brand: Omc ), ( Manufacturer Part Number: 436192 ), ( Part Type: Exhaust Housing ), ( Country Of Origin: United States )

Review OMC Evinrude Johnson 25hp Outboard Midsection Exhaust Housing Short fits 1987

The **Evinrude Johnson OMC 436192 / 395157 / 0436192 / 0395157 / 87 25HP Outboard Midsection Exhaust Housing** is a precision-engineered replacement component designed specifically for Evinrude Johnson 25 horsepower outboard motors from the mid-1980s, particularly those bearing the model designation **87**. This midsection exhaust housing serves as a critical link in the motor s exhaust system, ensuring optimal performance, durability, and compliance with emissions standards of its era. Crafted from high-grade marine-grade materials, this exhaust housing is built to withstand the rigors of saltwater corrosion, thermal cycling, and mechanical stress, making it a reliable upgrade or direct replacement for worn or damaged original components. The housing features a robust, seamless construction with reinforced flanges and precision-machined gaskets, designed to maintain a tight seal between the lower and upper sections of the outboard s exhaust manifold. Its design accommodates the motor s specific exhaust flow dynamics, reducing backpressure and improving engine efficiency while minimizing the risk of leaks or exhaust gas contamination. Whether used for restoration projects, routine maintenance, or as a proactive replacement to prevent future failures, this midsection exhaust housing ensures that the 25HP Evinrude Johnson outboard operates at peak performance with minimal maintenance demands. Its compatibility with the **87 series** guarantees a seamless fit, allowing for easy installation without the need for modifications to the surrounding exhaust system. For boaters seeking to extend the lifespan of their classic or vintage outboards, this component is an essential investment in reliability and performance.

### **Pros and Cons of buying a Evinrude Johnson 25HP Outboard Midsection Exhaust Housing (OMC Part Numbers: 436192, 395157, 0436192, 0395157, 87)**

#### **Pros**

1. **Compatibility and Fit**

- Designed specifically for the **25HP Evinrude Johnson outboard** (likely from the late 1980s to early 2000s, given the part number "87"), ensuring a precise fit without modifications.

- Replaces a worn or damaged midsection exhaust housing, restoring proper water flow and cooling efficiency.

2. **Performance Restoration**

- A failing or clogged exhaust housing can reduce engine performance, increase fuel consumption, and cause overheating. Replacing it restores optimal exhaust gas expulsion, improving throttle response and power output.

- Helps prevent **water pump cavitation**, which can lead to engine damage if left unaddressed.

3. **Prevents Leaks and Contamination**

- A damaged exhaust housing can allow raw fuel, oil, or coolant to mix with exhaust gases, contaminating the water cooling system. Replacement ensures a sealed environment, preventing corrosion and further damage.

- Reduces the risk of **saltwater corrosion** in marine environments, extending the life of internal components.

4. **Cost-Effective Repair**

- Replacing just the midsection housing is significantly cheaper than a full **lower unit overhaul** or engine replacement. Parts are relatively affordable compared to labor-intensive repairs.

- Avoids the need for frequent **cooling system flushes** or repairs caused by poor exhaust flow.

5. **Easy Installation**

- The midsection housing is accessible without major disassembly, making it a straightforward DIY repair for those with basic mechanical skills. Replacement typically requires only a socket wrench and possibly a new gasket.

- Many marine mechanics charge minimal labor costs for this repair, making it a low-risk investment.

6. **Extends Engine Life**

- By maintaining proper cooling and exhaust flow, the repair helps prevent long-term damage to the **water pump, impeller, and lower unit seals**, delaying costly overhauls.

7. **Warranty and Authenticity**

- Purchasing from **authorized dealers or OEM suppliers** ensures genuine parts with proper warranties, reducing the risk of counterfeit or low-quality replacements.

---

#### **Cons**

1. **Part Availability and Pricing**

- **Evinrude Johnson 25HP outboards from the late 1980s/early 2000s** may have limited aftermarket support, making parts slightly harder to find than newer models. Prices can vary based on supplier and demand.

- Some online sellers may offer **aftermarket or remanufactured** alternatives, which may not fit perfectly or last as long as OEM parts.

2. **Potential for Additional Issues**

- If the **exhaust housing is part of a larger problem** (e.g., a failing water pump, cracked lower unit, or clogged impeller), replacing just the housing may not fully resolve performance issues. A **diagnostic check** is advisable before purchase.

- Corrosion inside the housing or surrounding components may require additional cleaning or replacement of gaskets/seals.

3. **Installation Challenges**

- If the boat s **lower unit or exhaust system is heavily corroded**, removing the old housing may be difficult, requiring extra tools (e.g., penetrating oil, a pry bar, or a torque wrench).

- **Gasket replacement** is critical using the wrong type or failing to seal properly can lead to leaks.

4. **Labor Costs (If Not DIY)**

- While the part itself is affordable, **marine mechanics may charge $50 $150 ** for labor, depending on location and shop rates. DIY saves money but requires time and effort.

5. **Age-Related Wear**

- If the outboard is **old (20 years)**, other components (e.g., **propeller, stern drive, or electrical system**) may also need attention. A full **pre-purchase inspection** is recommended before investing in just this part.

6. **Environmental and Mechanical Risks**

- **Saltwater corrosion** can spread to adjacent parts (e.g., **exhaust manifolds, fuel lines, or electrical connections**) if not addressed proactively. A thorough inspection is necessary.

- If the housing was damaged due to **impact or improper handling**, the underlying issue (e.g., a loose mount, damaged trim tab) may recur unless fixed.

---

### **Conclusion**

Replacing the **Evinrude Johnson 25HP midsection exhaust housing** is a **highly recommended repair** for boats experiencing **poor performance, overheating, or exhaust-related issues**. The benefits **improved cooling, restored power, leak prevention, and long-term engine protection** far outweigh the minor drawbacks, which are mostly related to **part availability, installation effort, and potential secondary issues**.

This is a **cost-effective, low-risk repair** that can **extend the life of your outboard** and avoid more expensive failures down the line. However, it should be part of a **broader maintenance plan**, including checks on the **water pump, impeller, and lower unit seals**, especially if the boat is frequently used in **saltwater or rough conditions**.

---

### **Recommendation**

1. **Verify Compatibility**

- Confirm the **exact model year and series** of your Evinrude Johnson 25HP outboard to ensure the part numbers (436192, 395157, etc.) match. Cross-reference with the **engine serial number** or a **marine parts database**.

2. **Purchase from a Trusted Source**

- Buy from **authorized dealers, marine supply stores, or reputable online retailers** (e.g., **MarineMax, West Marine, Evinrude s official site, or eBay from verified sellers**) to avoid counterfeit or damaged parts.

- Consider **remanufactured OEM parts** if available they often come with warranties and are cost-effective.

3. **Prepare for Installation**

- Socket wrench set (appropriate sizes for the housing bolts).

- Penetrating oil (e.g., PB Blaster) if the housing is stuck.

- New **gaskets/seals** (check if included with the part).

- Clean rags and a **waterproof workspace** (if working on the boat).

- Have a **friend or mechanic assist** if the housing is difficult to remove.

4. **Inspect Adjacent Components**

- **Cracks or corrosion** in the **exhaust manifolds or lower unit**.

- **Worn impeller or water pump** (common failure points in older outboards).

- **Leaking seals** around the housing or lower unit.

- If any of these are damaged, address them simultaneously to prevent future problems.

5. **Follow Proper Installation Steps**

- **Clean the mating surfaces** thoroughly to remove old gasket material and corrosion.

- **Apply marine-grade gasket maker or RTV silicone** to ensure a proper seal.

- **Tighten bolts evenly** in a **star pattern** to avoid warping the housing.

- **Test for leaks** by running the engine briefly (with the housing installed) and checking for **bubbles in the water** around the housing.

6. **Post-Installation Checks**

- Monitor the outboard for **improved cooling, smoother operation, and no overheating**.

- Listen for **unusual noises** (e.g., rattling, hissing) that could indicate **residual issues**.

- Schedule a **full service** if the boat hasn t been maintained recently, as other components may need attention.

7. **Consider Professional Help if Unsure**

- If you re **not comfortable with DIY repairs**, take the boat to a **marine mechanic** they can perform the replacement quickly and identify any hidden problems.

---

### **Final Verdict**

Your outboard is **losing power, overheating, or leaking** around the exhaust area.

You want to **prevent long-term damage** to the water cooling system.

You re willing to **spend $50 $150 on parts** (or less for remanufactured) and **a few hours of labor**.

The outboard is **severely corroded**, and other components (e.g., lower unit) are likely to fail soon.

You **cannot confirm the part numbers match your exact model**.

You **lack basic mechanical skills** and cannot safely perform the repair.

**Overall, this is a smart investment** for maintaining an older Evinrude Johnson 25HP outboard. Prioritize **quality parts, proper installation, and follow-up inspections** to maximize the repair s effectiveness.

Details:

Item still has some exhaust suit buildup on the inside. This part has been power washed and inspected for cracks or mechanical damage, threads are in good condition also. The parts manual shows numbers 436192 or 395157 for this item. Removed from a 1987 Johnson model J25RCUR 25HP Rope Start Outboard with standard short shaft lower unit.

part #: 436192 prices

• $74.99-$275.95

specifications ouboaen:

• for makes: Evinrude, Johnson, Omc
• for years: 1987
• brand: Omc
• mpn: 436192
• part type: Exhaust Housing
• country of origin: United States

payments ouboaen:

• wallet: Paypal
• other
• credit card: Diners-club

offer ouboaen:

• availability: In Stock
• started: April 2, 2026
• sold: 0
• options: Ship-to-home
• quantity: 1

returns ouboaen:

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

general ouboaen:

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

seller ouboaen:

• rating: 100.0%
• # reviews: 567
• city: Merigold, Mississippi

shipping ouboaen:

• class: Economy
• service: FedEx Ground Economy
• carrier: FedEx
• transit: 4-9 Days
• type: Calculated
• cost: $0.00

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