Indmar Marine Raw Water Pump – Full Barb | Part #685001

Keep your cooling system flowing with this genuine Indmar raw water pump, full barb configuration. The raw water pump is the heart of your Indmar engine's cooling system — responsible for drawing water from outside the boat and circulating it through the heat exchanger or raw water cooling circuit to keep your engine at the correct operating temperature. Without a functioning raw water pump your engine will overheat rapidly and catastrophically.

Compatible with: Indmar marine engines with raw water cooling systems , Contact us to verify fitment for your specific model year before ordering.

What is a Full Barb raw water pump?
The full barb configuration refers to the hose connection fittings on the pump body — full barb fittings provide a more secure, leak-resistant connection for raw water hoses compared to standard fittings. This is particularly important on the raw water inlet side where suction pressure can cause poorly fitted hoses to collapse or pull off — leading to immediate loss of cooling water flow and rapid engine overheating.

What does the raw water pump do?
Unlike the freshwater coolant circuit which recirculates the same coolant, the raw water pump draws water directly from the lake, river, or reservoir your boat is operating on and uses it to:

• Cool the heat exchanger on fresh water cooled engines
• Directly cool the engine block on raw water cooled engines
• Cool the exhaust system through water injection into the exhaust
• Maintain safe engine operating temperatures under all load conditions

What is the impeller and why does it matter?
Inside the raw water pump is a rubber impeller — the rotating component that actually moves the water. The impeller is a service item that requires regular replacement and is the most common point of failure in the raw water cooling system. Always ensure your impeller is serviced regularly — a failed impeller means no cooling water flow and a very rapid engine overheat.

Signs your raw water pump needs attention:

• Engine overheating or running hotter than normal
• No water visible from the exhaust outlet at idle
• Reduced water flow from the exhaust
• Coolant temperature spiking under load
• Impeller fragments found in the cooling system
• Visible water leaks from the pump body or fittings
• Grinding or unusual noise from the pump area
• Pump body cracking, corrosion, or physical damage

How often should you service it?
Inspect your raw water pump and replace the impeller every season or every 100 hours of operation — whichever comes first. The pump body itself is a long life component but should be replaced if cracked, heavily corroded, or if the bearing shows signs of wear. Never run your raw water pump dry — even briefly — as this destroys the impeller almost instantly.

Pro tip: Always carry a spare impeller on board — it's one of the smallest and cheapest insurance policies you can have on the water. A raw water pump impeller failure is one of the most common causes of on-water breakdowns and engine overheats. Being able to replace it on the spot rather than requiring a tow could save your day — and your engine.

Features:

• Genuine Indmar OEM part
• Full barb hose fittings for secure leak resistant connections
• Designed for Indmar raw water cooling systems
• High flow design for efficient cooling water circulation
• Durable construction for continuous marine raw water use
• Direct replacement — no modifications needed

Part Number: 685001
In stock and shipped fast from Australia 🇦🇺