How to Replace, Maintain & Choose the Right Marine Pump Impeller 

Keep your boat running at peak performance with the official Jabsco impeller replacement guide. Whether you’re a seasoned skipper or new to marine maintenance, this resource will walk you through:

• How to replace a Jabsco flexible impeller
• Choosing between neoprene and nitrile materials
• Tools and techniques for safe removal
• Preventive maintenance to avoid pump failure

Why Jabsco Flexible Impellers?Jabsco flexible impellers are precision-engineered for a range of bronze flexible impeller pumps—commonly used in:

• Marine engine cooling systems
• Bilge pumping
• Freshwater or seawater transfer
• Diesel fuel transfer (nitrile impellers only)

Their high-quality construction ensures efficient water flow, long service life, and compatibility with Jabsco, Johnson, Sherwood, and other leading marine pump brands.

Choosing the Right Impeller MaterialApplicationRecommended MaterialAdvantagesEngine cooling, freshwater, or seawater with minimal oil/dieselNeopreneExcellent performance in clean or lightly contaminated water
Bilge water contaminated with oil/dieselNitrileSuperior oil and diesel resistance, ideal for harsh bilge conditions
When to Replace Your ImpellerMarine experts recommend replacing your impeller every 12 months — even sooner in harsh operating conditions.
Why replace annually?

• Rubber impellers wear over time
• Blades can crack, harden, or break
• Prevents sudden pump failure at sea

Pro Tip: Always carry at least one spare impeller on board. A broken impeller offshore can leave you stranded.

Step-by-Step: How to Replace a Jabsco Flexible Impeller1. Remove the Pump End Cover

• Loosen and remove the end-cover screws.

2. Extract the Old ImpellerUse one of these safe methods:

• Jabsco Impeller Removal Tool (recommended)
• Channel-lock pliers (grip firmly, avoid damaging vanes)

Avoid screwdrivers — they can damage the pump body and risk injury.
3. Prepare the New Impeller

• Lightly coat the impeller with Jabsco glycerine or impeller lubricant.
• Align vanes in the correct rotation direction.

4. Install and Secure

• Slide the impeller into the pump body.
• Fit a new gasket and replace the cover plate.

Recommended Tool: Jabsco Flexible Impeller Removal ToolEngineered for quick, safe removal in tight spaces.
Features:

• Three-stage extraction system
• Protects pump housing from damage
• Corrosion-resistant aluminum and stainless steel

Available Models:

• 50070-0080 — for impellers up to 57 mm (2¼ in)
• 50070-0040 — for impellers up to 65 mm (2½ in)
• 50070-0200 — for impellers up to 118 mm (4½ in)

Frequently Asked Questions (FAQ)Q: Can I reuse an old impeller?
A: No — even if it looks intact, rubber loses flexibility over time, reducing pump performance.
Q: Which is better, neoprene or nitrile?
A: Neoprene is ideal for cooling and clean water. Nitrile is the choice for oil/diesel-contaminated bilge water.
Q: What’s the most common reason impellers fail?
A: Running dry — always prime your pump before operation.
Q: Are Jabsco impellers compatible with Johnson or Sherwood pumps?
A: Yes — many Jabsco impellers are cross-compatible, but check part numbers before purchase.

Related Guides & Parts

• Jabsco Impeller Identification​