3840664 Exhaust Riser | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta exhaust riser from the Inlet and Exhaust System group, weighing 7.666 kg and superseding part number 3809216. No engine applications are listed against it, so the old number is the way to identify it. Riser 3840663 is the lighter version at 5.897 kg and supersedes 3809157.

⚙️ Key Features

• 7.666 kg
• Supersedes 3809216
• Inlet and Exhaust System group
• Heavier of the two risers here, against 3840663

🔌 Function

Lifts the exhaust above the waterline and mixes cooling water into the gas flow before the hose run.

⚠️ Common Signs of Failure

• Rust weeping or pinholing through the riser wall
• Water found in a cylinder, or the engine locking on the starter
• Steam or exhaust escaping at the flange joints
• Carbon and scale narrowing the gas passage, raising back pressure
• White smoke, misfire or hard starting from water carryover

🛠️ Service Notes

• Inspect the internal bore whenever the riser is off - external appearance says little about the corrosion inside
• Fit new gaskets, water fitting seals and fasteners, as the originals seize
• If water has reached a cylinder, deal with that before the engine is turned over again

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 3840664 → Supersedes 3809216 → Supersedes 3587372 → Supersedes 3584478

OEM / Related Numbers

• 3809216 earlier number superseded by this part
• 3587372 earlier number superseded by this part
• 3584478 earlier number superseded by this part

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging