Sierra 18-3082 Impeller, OEM OMC 382547 Replacement for Evinrude 55/60/65/70 HP Outboards

The Sierra 18-3082 is a water pump impeller for Evinrude outboard motors, designed to circulate cooling water through the engine and keep it running at safe operating temperatures. As the impeller wears or the vanes take a set, cooling flow drops and the engine is at risk of overheating, so this part is a routine maintenance replacement for boat owners servicing their water pump. It is built to fit directly in place of the original impeller for the applicable Evinrude horsepower and year ranges, restoring proper water pump output without modification. The impeller is a direct cross-reference to OMC part number 382547, so it can be ordered using either the Sierra number or the OMC equivalent. It ships as a single impeller unit and is intended for use in salt water as well as fresh water service. Regular impeller replacement, typically as part of an annual water pump service, helps prevent premature wear on the pump housing and reduces the chance of a cracked engine block from overheating. This part is sold under the Sierra brand and is a recognized aftermarket equivalent used widely for Evinrude water pump rebuilds.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3082
• Product Name: Impeller
• Weight: 0.21 pounds
• Color: white
• Engine Type: 4 Stroke
• Fuel Type: Gasoline
• Mounting Type: Engine Mount
• Recommended Use: For Salt Water
• UPC: 030999315342
• OEM Cross-Reference: OMC 382547

Fitment

• Evinrude 55 HP, 1968-1969
• Evinrude 60 HP, 1970-1971
• Evinrude 65 HP, 1972-1973
• Evinrude 70 HP, 1974-1978

Replaces (OEM)

• OMC 382547

Frequently Asked Questions

What does the Sierra 18-3082 impeller fit? The Sierra 18-3082 fits Evinrude 55 HP outboards from 1968-1969, 60 HP outboards from 1970-1971, 65 HP outboards from 1972-1973, and 70 HP outboards from 1974-1978.

Is the Sierra 18-3082 the same as OMC 382547? Yes, the Sierra 18-3082 is a direct cross-reference to OMC part number 382547 and can be used as a drop-in equivalent.

How much does the 18-3082 impeller weigh? The Sierra 18-3082 impeller weighs 0.21 pounds.

What color is the Sierra 18-3082 impeller? It is white, consistent with the standard rubber compound used in Sierra water pump impellers.

Can this impeller be used in salt water? Yes, the Sierra 18-3082 is recommended for use in salt water applications.

Is the 18-3082 a genuine OMC part or aftermarket? The 18-3082 is a Sierra-brand aftermarket impeller manufactured as a replacement for the OMC 382547 impeller, not an OEM OMC part.

How do I know if my impeller needs replacing? Reduced water flow from the tell-tale, engine overheating, or a worn/cracked impeller vane are signs the Sierra 18-3082 impeller should be replaced during water pump service.

What is included when I order the 18-3082? The order includes one Sierra 18-3082 impeller unit; it does not include the water pump housing or gasket kit.

Does the Sierra 18-3082 fit a 1980 Evinrude 55 HP? No, the 18-3082 covers the 1968-1969 model years for the 55 HP; a 1980 Evinrude 55 HP uses a different Sierra impeller.

What engine type is the 18-3082 designed for? The Sierra 18-3082 is designed for 4-stroke gasoline outboard engines within its listed Evinrude fitment range.

Is the Sierra 18-3082 mounted inside the water pump housing? Yes, it is an engine-mounted impeller that installs inside the water pump housing on the applicable Evinrude outboards.