21085358 Cooling Hose | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta formed coolant hose for the D13B-A MP cooling-system assembly. This hose occupies a separate routing position from cooling hose 21085355 and is manufactured with the correct length, bends and end orientation for its assigned connections. Correct routing is essential because a hose that is twisted or forced into position can restrict coolant flow and place damaging side load on the adjoining pipes.

🚤 Compatibility

Typically suits:

• Volvo Penta D13C2-B MP
• Volvo Penta D13C2-A MP
• Volvo Penta D13C4-A MP
• Volvo Penta D13B-A MP
• Volvo Penta D13B-H MP
• Volvo Penta D13B-G MP
• Volvo Penta D13B-L MP
• Volvo Penta D13B-K MP
• Volvo Penta D13B-C MP
• Volvo Penta D13C4-B MP
• Volvo Penta D13C5-B MP
• Volvo Penta D13C6-A MP
• Volvo Penta D13C5-A MP
• Volvo Penta D13C7-B MP
• Volvo Penta D13C8-B MP

• Engine Family: D

⚙️ Key Features

• Genuine moulded D13B-A MP coolant-transfer hose
• Engine-specific bend pattern and connection orientation
• Designed for repeated pressure and temperature cycling
• Flexible section absorbs engine movement between rigid cooling pipes
• Not interchangeable with 21085355 unless the exact parts list for your engine specifically identifies it
• Engine type: 13-litre inline-six turbocharged marine diesel

🔌 Function

Transfers coolant between the assigned rigid pipes or housings while accommodating vibration, thermal expansion and small relative movement within the engine cooling system.

⚠️ Common Signs of Failure

• Coolant staining or dampness around the hose ends
• Collapsed inner wall causing restricted flow
• Swelling from oil or chemical contamination
• Cracks at bends or clamp positions
• Overheating or recurring coolant-level loss

🛠️ Service Notes

• Fit the hose dry onto clean, smooth stubs and push it fully onto the spigot so the clip lands behind the bead; do not use grease or sealant to help it on
• Keep the original routing and bend radius and use the correct clips, tightened evenly — a hose that is kinked, stretched or pulled to fit will fail early
• Check the stubs for corrosion, pitting and burrs while the hose is off, and clear any scale or debris out of the system
• Keep the hose away from hot surfaces and anything that can chafe it, and support long runs as they were originally clipped
• Refill, vent and run the engine to temperature, then re-check every joint and re-tighten the clips once the hose has bedded in

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 21085355 - companion cooling hose in the same D13B-A MP system
• 3594798 - associated water pipes, depending on engine configuration
• 3594799 - associated water pipes, depending on engine configuration
• 3808196 - related hose used elsewhere in the cooling assembly
• 991656 - spacer sleeve used in the associated mounting arrangement

📦 Condition

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