Volvo Penta Raw Water Cooling Hose 3862901

Volvo Penta 3862901 – Raw Water Cooling Hose

• Part Number: 3862901
• Brand: Volvo Penta (OEM Genuine)
• Official Product Type: Hose – Seawater / Raw Water Cooling Circuit
• System: Seawater (Raw Water) Cooling
• Diagram Position: Schematic position 12 in the Seawater Pump and Hoses assembly; located downstream of T-pipe 3862699 in the hose group feeding the engine oil cooler
• Used With: T-pipe 3862699, oil cooler 3862629, hose clamps 982645 / 983168
• Supersedes: No confirmed OEM supersession – order by active number 3862901
• Weight: Approx. 0.22 lb (100 g)
• Kit Contents: Raw water cooling hose only – T-pipe, oil cooler, and clamps are serviced separately

The 3862901 is a genuine OEM Volvo Penta molded raw-water cooling hose used in the seawater pump and hoses assembly on selected Volvo Penta gasoline marine engines. Parts diagrams place it at position 12 in the hose circuit, immediately downstream of T-pipe 3862699 and within the hose group that feeds the engine-mounted oil cooler 3862629. Several different molded hoses run side by side in this area of the cooling system — an exact OEM part number match ensures correct routing, proper fit at both hose ends, and leak-free service.

Compatible Applications

• Volvo Penta 4.3GXi-C – seawater pump and hoses assembly
• Volvo Penta 4.3GXi-CF – seawater pump and hoses assembly
• Volvo Penta 4.3GXi-E – seawater pump and hoses assembly
• Volvo Penta 4.3GXi-F – seawater pump and hoses assembly
• Volvo Penta 4.3GXi-G – seawater pump and hoses assembly
• Volvo Penta 5.0GXi-E – seawater pump and hoses assembly (diagram position 12)
• Volvo Penta 5.0GXi-GF – seawater pump and hoses assembly
• Volvo Penta 5.0GXi-N – seawater pump and hoses assembly
• Volvo Penta 5.7GXi-J – seawater pump and hoses assembly
• Volvo Penta 5.7Gi-300-N – seawater pump and hoses assembly
• Volvo Penta 5.7GiCE-300-M – seawater pump and hoses assembly

Serial Number Notice: Volvo Penta used several different molded hoses within these seawater cooling systems, and hose routing changed between engine revisions. Confirm the complete engine model, suffix, serial number, and seawater pump diagram position before ordering. Multiple hoses in this area look similar once removed from the engine.

When to Replace

Replace this hose when it shows any of the following: cracking or surface deterioration, hardened or brittle rubber, soft or swollen sections, chafing or abrasion damage, leakage at hose ends, deformation around clamp areas, or internal restriction or collapse. Also inspect and replace proactively whenever the seawater pump, oil cooler, or adjoining cooling components are serviced — disturbed hoses that show age should be replaced rather than reused.

Service Interval

Inspect raw-water cooling hoses annually or at each seasonal commissioning. Replace any hose showing stiffness, cracking, swelling, or clamp-area wear. Raw-water hoses are a high-value preventive replacement item — a failed cooling hose can cause rapid engine overheating.

Associated Service Parts

• Volvo Penta Seawater / Engine Flush T-Pipe 3862699 – T-pipe directly upstream of this hose in the cooling circuit
• Volvo Penta Hose Clamp 1399 – OEM marine hose clamp for use with this hose (diagram references 982645 / 983168)

Installation Notes

Before installation, inspect T-pipe 3862699, oil cooler 3862629, all adjoining hoses, and the associated hose clamps. Ensure the hose is fully seated at both ends, correctly routed per the seawater-pump diagram, and free from kinks or contact with moving or hot engine components. Replace hose clamps if they show any corrosion or reduced clamping force. After installation, run the engine with proper cooling-water supply and check all connections for leaks and unrestricted raw-water flow before returning to service.

Technical FAQ

Q: Is this a generic marine hose or a molded OEM hose?
A: This is a molded OEM hose with specific end dimensions and routing geometry matched to the Volvo Penta seawater pump circuit. Generic marine hose cut-to-length is not a direct substitute — the molded shape ensures proper routing and sealing at both connection points.

Q: Why do I need to confirm by serial number if I know my engine model?
A: Volvo Penta updated cooling-system hose routing between engine revisions within the same model family. Multiple molded hoses in this area can look nearly identical once removed. Confirming by engine serial number and diagram position 12 in the seawater pump assembly is the safest way to ensure you receive the exact hose for your configuration.

Q: Which engines does this hose fit?
A: Confirmed diagram-backed applications include 4.3GXi (C/CF/E/F/G), 5.0GXi (E/GF/N), 5.7GXi-J, 5.7Gi-300-N, and 5.7GiCE-300-M. Always confirm your specific engine model suffix and serial number before ordering.

Q: Should I replace the clamps at the same time?
A: Yes. Replace hose clamps whenever a cooling hose is replaced. Corroded or fatigued clamps can fail to seal properly on a new hose, causing leaks immediately after service.

Parts Desk Insights

Best Use Case: This is the correct part for customers replacing a cracked, hardened, or leaking raw-water cooling hose downstream of the T-pipe in the seawater pump circuit on 4.3, 5.0, and 5.7 GXi/Gi gasoline engines. Most often ordered alongside T-pipe 3862699 and OEM hose clamps as part of a full seawater hose circuit refresh.

Common Issues: The most frequent mistake is trying to substitute generic marine hose by diameter alone — the molded geometry of 3862901 is specific to the routing path in this circuit, and a straight or incorrect-angle hose will not seat properly. Customers also sometimes order the T-pipe separately without replacing the adjacent hose, or vice versa; doing both at the same time saves repeat labour and ensures both sealing surfaces are fresh.