Volvo Penta Exhaust Pipe Elbow 21751640 | OEM D4 D6 Wet Exhaust
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Volvo Penta OEM Exhaust Pipe Elbow — D4 / D6 Wet Exhaust System
Part Number: 21751640 | SKU: 21751640
Brand: Volvo Penta | Official Product Type: Exhaust Pipe Elbow
System: Wet Exhaust System
Estimated Weight: 3 kg
The genuine Volvo Penta OEM exhaust pipe elbow for selected D4 and D6 marine diesel wet exhaust applications. This elbow routes exhaust gases from the engine through the wet exhaust circuit, where cooling water is mixed with exhaust flow before exiting the vessel. Operating in a demanding environment of heat, moisture, carbon, and salt exposure, the exhaust elbow is one of the most wear-prone components in the marine diesel exhaust system. Confirm fitment by engine serial number before ordering.
Key Features
- Genuine Volvo Penta OEM exhaust pipe elbow — factory fit and material specification
- Designed for the wet exhaust circuit on Volvo Penta D4 and D6 diesel marine engines
- Integrates with the cooling-water side of the exhaust assembly for proper wet exhaust function
- Engineered to withstand the combined effects of heat, exhaust gases, cooling water, and salt exposure
- Direct OEM replacement — no modification required when correctly matched by serial number
Compatible Applications
- Volvo Penta D4 marine diesel engine family — selected variants
- Volvo Penta D6 marine diesel engine family — selected variants
- Fitment varies by engine version, exhaust configuration, and serial number range — always confirm using your engine serial number and the Volvo Penta exhaust assembly diagram before ordering
When to Replace
Replace the exhaust elbow when any of the following are present:
- Visible corrosion, scaling, or pitting on the elbow body or water jacket
- Exhaust gas or cooling water leakage at the elbow
- Cracking or structural damage to the casting
- Significant carbon buildup restricting exhaust flow
- Internal corrosion of the water jacket detected during inspection
- The elbow has been removed during major exhaust service and no longer meets reuse condition
Service Interval
Volvo Penta does not publish a fixed replacement interval for exhaust elbows — replacement is condition-based. Inspect the elbow at every annual service. On saltwater vessels or engines with high operating hours, more frequent inspection is recommended. Internal water jacket corrosion can be present even when the exterior appears serviceable, so internal inspection during removal is important.
Installation Notes
- Confirm fitment by engine serial number before installation
- Inspect mating surfaces, clamps, connector pieces, and related exhaust hoses during service — replace worn components at the same time
- Check for internal corrosion and carbon restriction before reassembly
- Use genuine Volvo Penta sealing and connection components where required
- Follow Volvo Penta service procedures and torque specifications for your specific engine package
Parts Desk Insights
Best Use Case: Exhaust elbows are one of the most proactive replacements you can make on a Volvo Penta diesel. They operate in a uniquely harsh environment — hot exhaust gases on one side, cooling water on the other — and internal water jacket corrosion often develops well before any external signs appear. This part is most commonly ordered during annual service, after an overheating event, or when exhaust leakage is detected. At $482, it’s a significant part, but far less costly than the engine damage that can result from a failed elbow causing exhaust backflow or cooling loss.
Common Questions: Customers often ask whether they can clean and reuse a corroded elbow — light carbon deposits can sometimes be cleaned, but internal water jacket corrosion or any cracking means replacement is the right call. When replacing the elbow, it’s also worth inspecting the exhaust connector, V-clamps, and adjoining hose sections at the same time to avoid a repeat service visit.
Technical FAQ
Q: How do I know if my exhaust elbow needs replacing?
A: Common signs include exhaust or water leakage at the elbow joint, visible external corrosion or cracking, reduced exhaust flow, or an overheating event traced to the exhaust circuit. Internal water jacket corrosion may only be visible when the elbow is removed — always inspect internally during service.
Q: Can I clean and reuse a corroded exhaust elbow?
A: Light carbon deposits can sometimes be cleaned, but any internal water jacket corrosion, cracking, or structural deterioration means the elbow should be replaced. A compromised elbow is a reliability risk in a critical engine system.
Q: What other parts should I inspect when replacing the exhaust elbow?
A: Inspect the exhaust connector, V-clamps, exhaust hose, and all mating gasket surfaces. Replacing worn ancillary components at the same time avoids repeat service and ensures the full exhaust circuit is in good condition.
Q: Is this elbow specific to one D4 or D6 variant?
A: Fitment varies by engine version and serial number range. Always confirm using your engine serial number and the Volvo Penta exhaust assembly diagram for your specific engine before ordering.
Related Parts
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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