Volvo Penta Water Intake Hose – OEM Part 21651097
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Volvo Penta Water Intake Hose – OEM Part 21651097
Part Number: 21651097
Supersedes: 3808170
Brand: Volvo Penta
System: Raw Water Cooling / Internal Drive Plumbing
Engine Family: Volvo Penta DPH and DP-R sterndrive series
This is the genuine OEM molded water intake hose for Volvo Penta sterndrive cooling systems. Pre-formed to exact routing specifications, it delivers raw water from the drive intake through the internal plumbing to the engine — maintaining unrestricted flow without kinking or collapsing under suction. This hose supersedes earlier part number 3808170.
Compatible Applications
- Volvo Penta DPH-A sterndrive
- Volvo Penta DPH-B sterndrive
- Volvo Penta DPH-C sterndrive
- Volvo Penta DPH-D / DPH-D1 sterndrive
- Volvo Penta DP-R / DPR-A / DPR-B / DPR-C sterndrive
- Confirm fitment using your sterndrive model and serial number — located on the drive ID plate
Technical Specifications
- Part Number: 21651097
- Supersedes: 3808170
- Type: Molded raw water intake hose
- System: Raw water cooling / internal sterndrive plumbing
- Construction: Reinforced marine-grade rubber, heat and pressure resistant
- Weight: Approx. 400 g (0.4 kg)
Parts Desk Insights
This hose is one of the more commonly overlooked parts during sterndrive service — it lives inside the drive assembly and isn't visible once installed. Failures don't always show as an external leak; instead, customers typically notice overheating or reduced cooling flow first. It's most often ordered during a full DPH or DP-R drive rebuild, or when diagnosing a cooling issue that doesn't trace back to the impeller or thermostat. Replacing it proactively during any major drive service is good practice — it saves a full teardown if it fails later.
Service Interval
Inspect during every sterndrive service. Replace immediately if cracking, soft spots, swelling, or internal collapse is found. Proactive replacement is recommended during any major drive rebuild or at the first sign of unexplained overheating.
Signs This Hose Needs Replacement
- Engine overheating or reduced cooling flow
- Cracking, soft spots, or swelling in the hose body
- Internal collapse under suction
- Water leaks inside the drive assembly
- Scheduled sterndrive service or rebuild
Installation Notes
- This is a molded hose — orientation matters; do not twist or force into position
- Replace hose clamps at the same time
- Inspect all mating fittings and water passages before reinstalling
- Pressure test the cooling system after installation
Technical FAQ
Q: What's the difference between 21651097 and the older 3808170?
21651097 is the current OEM part number and directly supersedes 3808170. They are the same application — use 21651097 when ordering.
Q: Will this fit my engine?
This hose fits specific DPH and DP-R sterndrive configurations. Always verify using your drive model and serial number before ordering.
Q: My engine is overheating but the impeller is fine — could this be the cause?
Yes. Internal hose collapse or cracking can restrict raw water flow without showing any external leak. This hose is a common secondary cause of cooling issues after the impeller has been ruled out.
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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