Aftermarket Cummins Stainless Steel Exhaust Flange Kit 4BTA, 6BTA 5.9, QSB5.9, 6CTA, QSC8.3 & QSB6.7 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Cummins Stainless Steel Exhaust Flange Kit 4BTA, 6BTA 5.9, QSB5.9, 6CTA, QSC8.3, QSB6.7 & QSL9 - Part Number: CUMA

A cast and CNC-machined AISI 316 stainless-steel turbo exhaust flange kit for Cummins 4BTA, B-Series, C-Series and Q-Series marine engines. It includes both sealing options and the temperature-sensor blanking hardware required for a custom dry-riser or mixing-elbow installation.

⚙️ Key Features

• AISI 316 stainless turbo flange

• CNC-machined sealing and bolt faces

• Covers Cummins 5.9L, 6.7L, 8.3L and 9L marine families

• Includes graphite and stainless exhaust gaskets

• Includes sensor plug and mounting hardware

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• HDI CUMA (aftermarket Cummins universal marine exhaust flange kit)

OEM / Related Numbers:

• HDI CUMA

• Cummins 3921961

• HDI GC

• HDI GCS

Aftermarket / Verified Equivalents:

• HDI Marine: CUMA

Included Components:

• Turbo-side stainless flange - Part Number: HDI CUMA

• Graphite/copper gasket - Part Number: HDI GC

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

• Exhaust-temperature sensor blanking plug - supplied in CUMA kit

• 4 × mounting bolts and washers - supplied in CUMA kit

🚤 Compatibility

Commonly used on:

• Custom Cummins marine dry-riser and mixing-elbow fabrication

Typically suits:

• Engine models:

• Cummins 4BTA

• Cummins 6BT5.9

• Cummins 6BTA5.9

• Cummins QSB5.9

• Cummins 6CTA8.3

• Cummins QSC8.3

• Cummins QSB6.7

• Cummins QSB6.9

• Cummins QSL9

• Material: cast and CNC-machined AISI 316 stainless steel

• Part Type: turbo exhaust flange installation kit

🔌 Function

The flange provides the correctly machined interface for attaching a custom marine exhaust riser or mixer to the Cummins turbocharger outlet.

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