128370-13550 Aftermarket Yanmar 3GMD Stainless Steel Exhaust Mixing Elbow HDI GMS5 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Yanmar 3GMD Stainless Steel Exhaust Mixing Elbow HDI GMS5 - Part Number: 128370-13550

A cast AISI 316 stainless-steel mixing elbow replacing Yanmar 128370-13550 on older 3GMD and 3HM35 engines. It uses the dedicated 128370-13231 graphite/copper flange gasket.

⚙️ Key Features

• Cast AISI 316 stainless-steel construction

• Replaces Yanmar 128370-13550

• For 3GMD and 3HM35 engines

• 50mm exhaust outlet

• Uses gasket 128370-13231

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• GMS5 → Replaces Yanmar 128370-13550

OEM / Related Numbers:

• 128370-13550

• 128370-13231

• HDI GMS5

• HDI GGMS5

Aftermarket / Verified Equivalents:

• HDI Marine: GMS5

• Recmar: MAR128370-13550INOX

🚤 Compatibility

Commonly used on:

• Yanmar older GM/HM direct-flange wet-exhaust systems

Typically suits:

• Engine models:

• Yanmar 3GMD

• Yanmar 3GM30

• Yanmar 3HM35

• Yanmar 3HM35F

• Material: cast AISI 316 stainless steel

• Exhaust Outlet: 50mm

• Associated Gasket: 128370-13231

🔌 Function

The elbow carries exhaust away from the engine and injects seawater before the flexible exhaust hose.

Common signs of failure:

• External corrosion, cracking or pin-hole leakage

• Internal carbon, rust or salt restriction

• Cooling water entering the manifold, turbocharger or cylinders

• Steam, reduced cooling-water discharge or an abnormally hot exhaust hose

• Loss of power caused by excessive exhaust back-pressure

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging