Exhaust Elbow – Fits Yanmar 1GM, 2GM, 3GM & 3HM Series (Replaces 104214-13521, 104214-13531)
Exhaust Elbow – Fits Yanmar 1GM, 2GM, 3GM & 3HM Series (Replaces 104214-13521, 104214-13531) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Elbow – Fits Yanmar 1GM, 2GM, 3GM & 3HM Series (Replace...
Product Details
This aftermarket Exhaust Elbow – Fits Yanmar 1GM, 2GM, 3GM & 3HM Series is a direct replacement for models including 1GM, 1GM10, 2GM, 2GM20, 3GM, 3GM30, 3HM, and 3HM35 engines for all production years. It serves the critical function of mixing exhaust gases with cooling water before discharge.
This part replaces and is interchangeable with Yanmar OEM part numbers 104070-13520, 104214-13521, 104214-13531, 124070-13520, 127070-13520, 128370-13600, 128370-13610, and 128990-13520.
- Designed for direct OEM replacement, bolting directly to the exhaust manifold.
- Constructed from corrosion-resistant 316 stainless steel for extended service life.
- Includes the required mounting gasket for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 104070-13520 |
| Yanmar | 104214-13521 |
| Yanmar | 104214-13531 |
| Yanmar | 124070-13520 |
| Yanmar | 127070-13520 |
| Yanmar | 128370-13600 |
| Yanmar | 128370-13610 |
| Yanmar | 128990-13520 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This exhaust elbow fits a wide range of Yanmar GM, HM, and YM series marine diesel engines.
| Brand | Model | Stroke | Years | OEM Part No. |
|---|---|---|---|---|
| Yanmar | 1GM | 4-Stroke | All | 104070-13520 |
| Yanmar | 1GM10 | 4-Stroke | All | 104070-13520 |
| Yanmar | 2GM | 4-Stroke | All | 104214-13521 |
| Yanmar | 2GMF | 4-Stroke | All | 104214-13521 |
| Yanmar | 2GMFYE | 4-Stroke | All | 104214-13521 |
| Yanmar | 2GMFL | 4-Stroke | All | 104214-13521 |
| Yanmar | 2GM20F | 4-Stroke | All | 104214-13521 |
| Yanmar | 2GM20FVE | 4-Stroke | All | 104214-13521 |
| Yanmar | 2GM20F-YEU | 4-Stroke | All | 104214-13521 |
| Yanmar | 2GM20FC-YEU | 4-Stroke | All | 104214-13521 |
| Yanmar | 2GMD | 4-Stroke | All | 104214-13521 |
| Yanmar | 3GM | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GMF | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM-FY-E | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM-FYE-E | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM-FLE | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GMD | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM30 | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM30VE | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM30B | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM30C | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM30-YEU | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM30C-YEU | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM30F-YEU | 4-Stroke | All | 104214-13531 |
| Yanmar | 3GM30FC-YEU | 4-Stroke | All | 104214-13531 |
| Yanmar | 3HM | 4-Stroke | All | 104214-13531 |
| Yanmar | 3HMF | 4-Stroke | All | 104214-13531 |
| Yanmar | 3HM35 | 4-Stroke | All | 104214-13531 |
| Yanmar | 3HM35C | 4-Stroke | All | 104214-13531 |
| Yanmar | 3HM35F | 4-Stroke | All | 104214-13531 |
| Yanmar | 3YM20 | 4-Stroke | All | 104214-13531 |
| Yanmar | 3YM30 | 4-Stroke | All | 104214-13531 |
| Yanmar | 3YM30AE | 4-Stroke | All | 104214-13531 |
Technical Specs
- Product Type
- Marine Diesel Engine Exhaust Elbow/Mixing Elbow
- Installation
- Direct OEM replacement
- Connection
- Bolts to exhaust manifold
- Housing Material
- 316 stainless steel
- Housing Color
- Natural metal
- Dimensions
- 16.0" L x 15.5" W x 15.5" H
- Fitting Type
- Bolted flange to manifold; hose connection to exhaust
- Thread Size
- 3/8" pipe (water inlet)
- Outlet Diameter
- 2" for exhaust hose connection
- Warranty
- 1 year
What’s in the Box
- 1 x Exhaust Elbow
- 1 x Gasket (Replaces REC128370-13201)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery's negative terminal.
- Close the raw water intake seacock to prevent water from entering the boat.
- Loosen the clamps and carefully remove the exhaust hose and raw water inlet hose from the old elbow.
- Unbolt the existing exhaust elbow from the engine's exhaust manifold. Remove the old gasket and any remaining sealant or debris.
- Thoroughly clean the mating surface on the manifold to ensure a proper seal.
- Position the new gasket on the manifold, followed by the new stainless steel exhaust elbow.
- Hand-tighten the mounting bolts, then torque them to the manufacturer's specified values in a crossing pattern.
- Reconnect the exhaust hose and raw water inlet hose, ensuring all clamps are secure.
- Re-open the raw water seacock and reconnect the battery terminal.
- Start the engine and carefully inspect for any exhaust gas or water leaks around the new elbow and its connections.
Troubleshooting & FAQ
How do I know if my exhaust elbow is failing?
Common signs of a failing exhaust elbow include overheating, steam in the exhaust, reduced engine power, water leaks around the manifold, or external corrosion and rust. Clogging from carbon and scale buildup is the most frequent cause of failure, restricting water and exhaust flow.
What is the advantage of a stainless steel elbow vs. the OEM cast iron?
While the original Yanmar elbows are cast iron, this aftermarket version is made from 316 stainless steel. Stainless steel offers superior resistance to corrosion and erosion from hot, acidic exhaust gases and saltwater, which can significantly extend its service life compared to cast iron.
How often should I inspect or replace my mixing elbow?
It is recommended to remove and inspect your exhaust elbow every 500 hours or every 2-3 years, whichever comes first. Replacement intervals vary widely based on usage (salt vs. fresh water, engine hours), but proactive replacement (e.g., every 5 years) can prevent catastrophic failure and engine damage.
Will this fit my specific Yanmar engine model?
This part fits all models listed in the compatibility table above. The GM, HM, and YM series share common exhaust elbow designs. However, always verify by comparing the OEM part number on your existing elbow with the numbers in our Part Number Matrix.
What happens if I don't replace a clogged elbow?
A clogged elbow will restrict exhaust gas and water flow, leading to increased backpressure and engine overheating. In severe cases, it can force water back into the engine's cylinders, causing catastrophic hydrostatic lock and internal engine damage.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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