Mercury/Mariner 30–70 HP & Suzuki 55/65 HP Outboard Impeller

This versatile impeller fits many older Mercury/Mariner outboards from 30 HP up to 70 HP, as well as certain Suzuki two-stroke outboards (DT55 and DT65) from the mid-1980s to mid-1990s. During that era, some engine designs shared similar water pump components, and this impeller cross-references among them. Installing this impeller will ensure your vintage mid-range engine maintains adequate cooling water flow, preventing the overheating that can occur in older motors when impellers wear out.

With a diameter of about 52 mm, this 6-blade impeller is compact yet efficient and built to OEM standards. It’s ideal for restoring the cooling system on older fishing boats, runabouts, or classic Suzuki-powered craft. Made from quality marine-grade rubber, it flexes to pump water effectively even at low RPMs, ensuring stable cooling at idle. Replacing an old impeller with this unit can improve water circulation and extend the life of your outboard’s powerhead.

• Mercury Applications: Great for Mercury “Classic” models like the 4-cylinder 40/50 HP and 3-cylinder 70 HP from the 1970s/80s, as well as smaller 2-cylinder 30 HP units. Many Mariner-branded versions of this era (some built by Yamaha or Tohatsu under OEM agreements) also use this impeller.
• Suzuki Applications: Direct replacement for water pump impellers in Suzuki DT55 and DT65 outboards (1985–1995 range). Helps maintain proper cooling in these mid-size Suzuki engines often found on older fiberglass runabouts and fishing boats.
• Vintage Boat Fit: Recommended for older 4–6 m boats with 2-stroke engines, where maintaining cooling is crucial during summer outings or trolling. Typical use cases include classic bass boats, ski boats, or day cruisers powered by these engines.
• Protect Your Engine: Avoid costly engine damage by replacing the impeller every couple of seasons. This small part is critical to preventing overheating in older engines, especially if running in sandy or silty waters that can wear impeller blades faster.
• Maintenance: Easy to install with basic mechanical skills – a quick fix to rejuvenate your cooling system. Keep a spare on hand if you frequently use your vintage outboard in remote areas or for peace of mind during restoration projects.