Defender US
Free Shipping on orders over $99*
Free Shipping
over $99*
Customer Service
Sierra

Sierra Mercruiser Water Circulating Pump - 18-3506-1

Item: #1780921 | Part Number: 18-3506-1
$225.99
or 4 interest-free payments of $56.50
Important Info Noted
Important Info
Want an email once available?
Notify Me
Total
$225.99
or
Need Help? Speak to an Outfitting Specialist [email protected] 1-800-628-8225 MON-FRI 9AM-5:30PM SAT 9AM-3PM
Description

The Sierra Mercruiser Water Circulating Pump 18-3506-1 is designed for reliable cooling in select Mercruiser V6 MCM and newer 4.3L engines. Built to OEM specifications, it ensures efficient water flow and helps prevent overheating. A direct replacement for common Mercruiser and Volvo Penta pump models.

Product Details Part Numbers Reviews Questions

Image of : Sierra Mercruiser Water Circulating Pump - 18-3506-1 Sierra Mercruiser Water Circulating Pump - 18-3506-1 Item # 1780921

Description

Fits V6 MCM (s/n 1A063240 & Up); Newer 4.3L without water bypass hole.

Replaces:

  • Mercruiser Stern Drive:
    • 46-879194366
    • 46-879194401
    • 46-8M0094406
    • 46-8M6005225
  • Volvo Penta:
    • 21124846
WARNING

This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm.

For more information go to www.p65warnings.ca.gov.

Part Numbers for Sierra Mercruiser Water Circulating Pump - 18-3506-1

Related Categories

Related Categories

Reviews

  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getReviews, 32.58ms
  • REVIEWS, PRODUCT
  • bvseo-msg: HTTP status code of 404 was returned;

Questions

  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getContent, 31.94ms
  • QUESTIONS, PRODUCT
  • bvseo-msg: HTTP status code of 404 was returned;

Change Locale

United States - English Shop in currency: USD
Canada - English Shop in currency: CAD
Canada - Français Shop in currency: CAD

Explore

Guides
Brands

Helpful Information

Track My Order
Shipping Policy
Return Policy
Outlet Store
Commercial Accounts

Get In Touch

Customer Service
1-800-435-7180
Send a Message

Resources

Gift Cards
Privacy Policy
Conditions of Use
Accessibility Statement

Stay Connected

X
Facebook
Instagram
YouTube
Toggle desktop/mobile version
2026 © Defender. All Rights Reserved.
Sierra Mercruiser Water Circulating Pump - 18-3506-1
Total:
$225.99
Add to Cart