Sierra Water Seal Damper 18-1834 for Yamaha F9.9, FT9.9, T9.9 Outboard Motors

The Sierra 18-1834 is a water seal damper built for the cooling system of specific Yamaha 4-stroke outboard motors. It is designed as the dedicated damper seal component in the water pump assembly, positioned separately from the impeller, cup plate, housing, and cover kit parts that make up the rest of the pump. Buyers looking to service the cooling system on a covered Yamaha F9.9, FT9.9, or T9.9 outboard can order this part on its own without needing to replace the full housing or cover kit.

This water seal damper carries the Sierra manufacturer part number 18-1834 and fits Yamaha F9.9 outboards from model years 1985-05, FT9.9 outboards from model years 1985-90, and T9.9 outboards from model years 1985-05. Because it is cataloged as a standalone damper seal rather than part of a kit, it is a targeted fix for cooling system service where the housing, cup plate, and cover do not need replacement.

The part weighs 1 pound and is categorized as an engine part for the cooling system. Confirm your outboard's model designation (F9.9, FT9.9, or T9.9) and model year against the fitment listed below before ordering, since Yamaha's water pump components differ across model years and designations.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-1834
• Product Type: Water Seal Damper
• Category: Engine Parts
• UPC: 808282312015
• Weight: 1 pound
• Fitment: Yamaha F9.9 (1985-05), FT9.9 (1985-90), T9.9 (1985-05)

Fitment

• Yamaha F9.9, model years 1985-05
• Yamaha FT9.9, model years 1985-90
• Yamaha T9.9, model years 1985-05

Frequently Asked Questions

What does the Sierra 18-1834 water seal damper fit? It fits Yamaha F9.9 outboards from model years 1985-05, Yamaha FT9.9 outboards from model years 1985-90, and Yamaha T9.9 outboards from model years 1985-05.

Is 18-1834 a Sierra part number? Yes, 18-1834 is the Sierra manufacturer part number for this water seal damper.

Does the 18-1834 damper seal fit a Yamaha F9.9? Yes, it fits the Yamaha F9.9 for model years 1985-05.

Will 18-1834 fit a Yamaha FT9.9 outboard? Yes, the Sierra 18-1834 water seal damper fits the Yamaha FT9.9 for model years 1985-90.

Does 18-1834 work on a Yamaha T9.9? Yes, it fits the Yamaha T9.9 for model years 1985-05.

What part of the outboard does the water seal damper belong to? The 18-1834 is a cooling system component, specifically the damper seal used in the water pump assembly of the covered Yamaha outboard models.

How much does the Sierra 18-1834 water seal damper weigh? It weighs 1 pound.

Is the 18-1834 a complete water pump kit or just the seal? The 18-1834 is a standalone damper seal, listed separately from the housing, cup plate, and water pump cover kit parts for these Yamaha models.

Does 18-1834 fit more than one Yamaha outboard model? Yes, the same Sierra 18-1834 water seal damper is listed for three Yamaha designations: F9.9, FT9.9, and T9.9.

What category does the 18-1834 water seal damper fall under? It is categorized as an engine part, specifically for the outboard cooling system.