128890-13530 128397-13530 Exhaust Mixing Elbow for Yanmar 2YM15 3YM20 3GM30 3YM30 3GM30F | JLM Marine

Exhaust Mixing Elbow for Yanmar 2YM15 3YM20 3YM30 3YM30F Marine Diesel Engines

This exhaust mixing elbow is engineered for Yanmar marine diesel engines, providing reliable exhaust and cooling water routing for models including the 2YM15, 3YM20, 3YM30, and 3GM30F. Built to withstand the demanding marine environment, this component ensures proper exhaust flow and water injection to cool exhaust gases before they exit the system.

This part directly replaces Yanmar OEM numbers 128890-13530 and 128397-13530, offering a cost-effective solution for maintenance and repair without compromising performance.

• Features a 11/16" (17mm) water inlet and 2" (50mm) exhaust outlet with a 4-bolt flange for secure installation
• Designed for Yanmar inboard marine diesel engines with straightforward bolt-on fitment
• Manufactured to OEM specifications for dependable performance and durability

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket sources.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 × Exhaust Mixing Elbow

Installation Guide

1. Preparation: Ensure the engine is completely cool and disconnect the battery to prevent accidental starting.
2. Access: Locate the existing exhaust elbow on your Yanmar engine and clear the surrounding area for workspace.
3. Disconnect Water Line: Remove the cooling water hose from the 11/16" (17mm) inlet on the old elbow. Have a container ready to catch any residual coolant.
4. Disconnect Exhaust: Loosen and disconnect the 2" (50mm) exhaust hose from the outlet side of the elbow.
5. Remove Fasteners: Unbolt the four flange bolts securing the elbow to the engine manifold or exhaust outlet.
6. Remove Old Elbow: Carefully pull the old mixing elbow away from the engine, inspecting gasket surfaces for corrosion or damage.
7. Clean Surfaces: Thoroughly clean the mounting flange and gasket mating surfaces on the engine to ensure a proper seal.
8. Install New Elbow: Position the new exhaust mixing elbow onto the mounting flange, aligning all bolt holes carefully.
9. Secure Fasteners: Install the four flange bolts and tighten in a cross pattern to ensure even pressure and prevent leaks.
10. Reconnect Exhaust Hose: Attach the 2" (50mm) exhaust hose to the outlet and secure with appropriate marine-grade clamps.
11. Reconnect Water Line: Connect the cooling water hose to the 11/16" (17mm) inlet and tighten the clamp securely.
12. Test & Inspect: Reconnect the battery, start the engine, and check all connections for leaks while the engine warms up. Verify proper water flow through the exhaust.

Troubleshooting & FAQ

Q: How do I confirm this exhaust elbow fits my Yanmar engine?
A: Cross-reference your engine model (2YM15, 3YM20, 3GM30, 3YM30, or 3GM30F) with the compatibility table above, and verify your original part number matches 128890-13530 or 128397-13530. Measure the water inlet (11/16"/17mm) and exhaust outlet (2"/50mm) on your current elbow to confirm sizing.

Q: What are the signs that my exhaust mixing elbow needs replacement?
A: Common symptoms include visible corrosion or cracks on the elbow body, water leaks around the flange or connections, overheating due to restricted exhaust flow, or exhaust gases mixing improperly with cooling water. Regular inspection every season is recommended.

Q: How often should I replace the exhaust mixing elbow?
A: Replacement intervals depend on operating conditions, but most marine professionals recommend inspection annually and replacement every 3–5 years or sooner if operating in saltwater. Corrosion accelerates failure, so monitor closely if you notice performance changes.

Q: Can I use standard hardware store gaskets and bolts for installation?
A: Always use marine-grade gaskets and stainless steel fasteners rated for high-temperature exhaust applications. Standard materials may fail prematurely due to heat, vibration, and corrosion, leading to dangerous exhaust leaks.

Q: Is this an OEM part or aftermarket replacement?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.