C5.9 Aftermarket Cummins 6BTA/QSB5.9 Exhaust Mixing Elbow 6 x 1.5 Inch Cast 316 Stainless Steel | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Cummins 6BTA/QSB5.9 Exhaust Mixing Elbow 6 x 1.5 Inch Cast 316 Stainless Steel - Part Number: C5.9

A complete cast AISI 316 stainless-steel dry-riser and wet-mixing-elbow package for Cummins 6BTA 5.9 and QSB5.9 marine engines. It replaces the original Cummins 3919373 elbow arrangement and positions the 6-inch exhaust outlet above the water-injection point to reduce corrosion and back-flooding risk.

⚙️ Key Features

• Investment-cast AISI 316 stainless-steel construction

• 6-inch exhaust outlet

• 1-1/2-inch NPT cooling-water connection

• Complete dry elbow, mixer, insulation and sealing package

• Designed for Cummins 5.9L marine exhaust geometry

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• HDI C5.9 → Replaces Cummins 3919373

OEM / Related Numbers:

• HDI C5.9

• Cummins 3919373

• HDI GC

• HDI GCS

Aftermarket / Verified Equivalents:

• HDI Marine: C5.9

Included Components:

• Turbo-side stainless flange - HDI C5.9 component

• Dry exhaust elbow - HDI C5.9 component

• Wet mixing elbow - HDI C5.9 component

• Insulation blanket - HDI C5.9 component

• 2 × V-band clamps - HDI C5.9 components

• Graphite/copper turbo gasket - Part Number: HDI GC

• Stainless crush gasket - Part Number: HDI GCS / Cummins 3921961

• Mounting bolts and washers - supplied in HDI C5.9 kit

🚤 Compatibility

Commonly used on:

• Cummins 5.9L marine diesel wet-exhaust systems

Typically suits:

• Engine models:

• Cummins 6BTA 5.9 marine

• Cummins QSB5.9 marine

• Engine Displacement: 5.9L

• Exhaust Outlet: 6 in / 152mm OD

• Cooling-Water Connection: 1-1/2 in NPT

• Material: cast AISI 316 stainless steel

• Approximate Shipping Weight: 10kg

🔌 Function

The dry elbow carries hot turbocharger exhaust above the injection point. The mixing elbow then introduces seawater into the exhaust stream before it enters the wet exhaust hose.

Common signs of failure:

• Exhaust-gas or cooling-water leakage after assembly

• Restricted exhaust flow or excessive back-pressure

• Insufficient cooling-water injection into the wet exhaust

• Corrosion or pitting at the mating flanges

• Incorrect alignment, clamp engagement or gasket compression

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging