• Fast shipping

  • Free help & advice

  • Hassle-free returns

  • Factory direct prices

Flash Sale now on!

FLASHSALE26

18-74805 Lower Unit Seal Kit for Tohatsu F8/F9.9, Mercury 8/9.9 4-Stroke (R042475 & Up) | SeaSierra

Regular price $999.00

Worry-free returns

Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.


If the return is due to our error or a defective item, we’ll make it right.


Please contact us before returning any item.

Delivery and Shipping

Orders are typically processed within 1–2 business days.


U.S. orders usually arrive within 6–15 days, depending on stock location and destination.


International delivery times may vary due to customs processing.


Tracking information will be provided once your order ships.

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details:

  • SKU: 1874805
  • Manufacturer & Brand: SeaSierra
  • Category: Lower Unit Seal Kit

Compatibility:

Fits the Following Engines:

  • 6 (2 CYL.)(2-STROKE)(International) - 0N027903 THRU 0N055109
  • 6 (2 Cyl.)(International) - 0N055110 & Up
  • 8 (2 CYL.)(2-STROKE)(International) - 0N027903 THRU 0N055109
  • 8 (2 Cyl.)(International) - 0N055110 & Up
  • 8 (4-STROKE)(209cc) - 0P325500 & Up
  • 8 (4-STROKE)(209cc) - 0R042475 & Up
  • 8 SEAPRO (2 CYL.)(International) - 0N055110 & Up
  • 8 SEAPRO (2 CYL.)(International) - 0N014717 THRU 0N055109
  • 9.8 (2 CYL.)(International) - 0N007788 THRU 0N055109
  • 9.8 SEAPRO (2 Cyl.)(International) - 0N055110 & Up
  • 9.9 (4-STROKE)(209cc) - 0P325500 & Up
  • 9.9 (4-STROKE)(209cc) - 0R042475 & Up

Part Numbers and Replacements:

  • Replaces OEM Mercury/Mariner Part Numbers:
    • 27-804908A00
    • 27-8M0082883
    • 27-8M0065830
    • 27-804908A02
    • 27-8M0060176
  • Replaces Nissan/Tohatsu Part Number: 3B2-87321-0

Additional Information:

  • UPC: 808282343064
  • Manufacturer & Brand: SeaSierra
  • Weight: 0.06
  • Dimensions:
    • Length: 6.13
    • Width: 5.00
    • Height: 0.50
  • Note: Does not include Driveshaft Housing Gasket.
  • Specific Compatibility: Made to suit Nissan/Tohatsu F8/F9.9, Mercury 8/9.9 4-Stroke (R042475 & Up)

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • JCB
  • Maestro
  • Mastercard
  • PayPal
  • Union Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.