Volvo Penta Cooling Water Hose | 24509844 | D4 / D6 Series

Volvo Penta Cooling Water Hose — Part #24509844

Part Number: 24509844
Brand: Volvo Penta
Official Product Type: Cooling Water Hose
System: Raw Water Cooling / Exhaust-Side Cooling
Diagram Position: Object key 11 (D6-280A-A exhaust pipe / marine propulsion assembly)
Supersedes: 21768904
Weight: ~1.0 kg

This is a genuine Volvo Penta OEM molded cooling water hose for D4 and D6 series marine diesel engines. It is the current replacement for earlier hose 21768904, which is shown in the D6-280A-A exhaust pipe and marine propulsion assembly. Cross-reference coverage also places the earlier number across a broad range of D4 and D6 cooling-water applications. Because several molded hoses in this area of the engine can look similar once removed, always confirm by diagram position and serial number — not by shape alone.

Compatible Applications

Fitment is confirmed through the superseded number 21768904. Verify against your engine serial number and the correct Volvo Penta cooling or exhaust-pipe diagram before ordering. Cross-reference sources associate the earlier hose with the following D4 and D6 variants:

• D4-210A
• D4-225A
• D4-260A
• D4-300A
• D6-280A (including D6-280A-A)
• D6-300A
• D6-310A
• D6-330A
• D6-350A
• D6-370A
• Select DPH and DPR propulsion package variants

Wider model fitment is based on aftermarket cross-reference data. Confirm against the Volvo Penta serial-number parts diagram for your specific engine and hose routing before ordering.

Diagram Position

The strongest Volvo Penta diagram reference for the superseded hose (21768904) places it at object key 11 in the D6-280A-A exhaust pipe / marine propulsion assembly. Use this as your primary cross-check when identifying the correct hose during service.

Serial Number Requirement

Fitment can vary by engine version, propulsion package, and hose-routing layout. Always confirm part number 24509844 against your engine serial number and the correct Volvo Penta cooling or exhaust-pipe diagram before ordering. Several nearby molded hoses on D4 and D6 installations can look similar once removed — diagram position is the most reliable identification method.

When to Replace

Replace this hose when inspection reveals any of the following:

• Swelling, softening, or hardening of the hose body
• Cracking, crazing, or surface deterioration
• Wear or compression damage at clamp areas
• Seepage or weeping at hose ends
• Abrasion damage from contact with adjacent components
• Age-related deterioration during cooling system or exhaust-side service

If the hose has been disturbed during adjacent service and shows any visible wear, replacement at that time is good practice.

Installation Notes

• Confirm the diagram position and hose routing before ordering — do not match by shape alone
• Inspect clamps and adjoining pipe connections at the same time to avoid repeat leaks after reassembly
• Replace clamps if they show corrosion or have lost clamping force
• Verify the hose seats fully at both ends before tightening clamps

Superseded Part Numbers

• 21768904 — Superseded by 24509844 (current OEM ordering number)

Parts Desk Insights

Molded hoses in the D4 and D6 cooling and exhaust-side assemblies are one of the more common mis-order scenarios — several hoses in this area share similar diameters and bend profiles, and it’s easy to pull the wrong one by shape after teardown. The safest approach is to identify the diagram position first (object key 11 in the D6-280A-A exhaust pipe assembly for the superseded number), then confirm the current part number 24509844 against your engine serial number. If you’re not certain which hose you need, a photo of the hose in situ and your engine serial number will help us confirm the right part before you order.

Technical FAQ

Q: Is 24509844 a direct replacement for 21768904?
A: Yes — Volvo Penta parts references show 21768904 updated to 24509844. Order 24509844 as the current OEM part.

Q: How do I identify which hose I need on my D4 or D6?
A: Use the Volvo Penta parts diagram for your engine serial number and locate the hose by its diagram position (object key 11 in the D6-280A-A exhaust pipe assembly for this hose). Do not rely on shape or diameter alone — several nearby hoses look similar.

Q: Should I replace the clamps at the same time?
A: If the clamps show any corrosion or have been disturbed during service, replacing them at the same time is recommended to avoid a repeat leak.

Q: Can this hose be used on both D4 and D6 engines?
A: Cross-reference data supports both D4 and D6 applications, but fitment must be confirmed by engine serial number and diagram position for your specific engine variant.