My Account
Shopping Cart

Sierra 18-3314 Marine Water Pump Kit with Housing for Mercury/Mariner Outboards

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

18-3314
08/03/2036 3:05 PM
Sale Price

$83.68

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-3314 Water Pump Kit with Housing is a comprehensive, all-in-one water pump service kit engineered for Mercury and Mariner outboard engines. Designed to meet or exceed OEM specifications, this kit eliminates the time and hassle of sourcing individual replacement components — everything needed for a complete water pump overhaul is included in one package.

This kit is interchangeable with GLM 12140 and Mallory 9-48309.

Kit Includes (19 Components):

  • Impeller — Sierra 18-3017 (replaces OEM# 47-89984)
  • Water Pump Housing — Sierra 18-3116 (replaces OEM# 46-96148A1)
  • Water Pump Base — Sierra 18-3414 (replaces OEM# 46-96146A5)
  • Impeller Plate — Sierra 18-3117 (replaces OEM# 32435)
  • Water Tube Guide — Sierra 18-3109 (replaces OEM# 23-29804)
  • Water Pump Housing Bushing/Grommet — Sierra 18-3110 (replaces OEM# 26-38970)
  • Water Pump Gasket — Sierra 18-2919 (replaces OEM# 27-426312015)
  • Water Pump Base to Gear Housing Gasket — Sierra 18-2826 (replaces OEM# 27-856102015)
  • Water Pump Gasket — Sierra 18-2914 (replaces OEM# 27-856082015)
  • Water Pump Gasket — Sierra 18-2915 (replaces OEM# 27-856092015)
  • Gasket — Sierra 18-2801 (replaces OEM# 27-32438)
  • Drain Screw Gaskets (x2) — Sierra 18-2945 (replaces OEM# 12-20260, 1220159183)
  • Seal Ring — Sierra 18-2944 (replaces OEM# 26-45577)
  • O-Ring — Sierra 18-7158 (replaces OEM# 25-30613)
  • O-Ring — Sierra 18-7162 (replaces OEM# 25-33145)
  • O-Ring — Sierra 18-7173 (replaces OEM# 25-30224)
  • O-Ring — Sierra 18-7176 (replaces OEM# 25-90011)
  • O-Ring — Sierra 18-7196 (replaces OEM# 25-38099)
  • O-Ring — Sierra 18-7426 (replaces OEM# 35-30271)

Key Features:

  • Engineered to meet or exceed original equipment manufacturer (OEM) specifications
  • Complete housing kit — includes impeller, housing, base, wear plate, gaskets, O-rings, seal ring, grommet, and water tube guide
  • Pre-packaged kit eliminates the need to source individual components separately
  • Built to withstand demanding marine environments
  • Direct replacement for Mercury/Mariner OEM part numbers

Keeping your outboard's water pump in top condition is essential for preventing engine overheating. The Sierra 18-3314 delivers a reliable, cost-effective service solution with quality components that hold up in harsh saltwater and freshwater environments alike.

Good price

Not complicated. Checkout with Amazon made it even easier.

Great transaction, from easy of ordering to showing up at my door very quickly.

Very nice experience and just product looking for.

good

Grate

good

fast

Stuff I was looking for was easy to find and checkout was easy. All parts were for the vehicle i selected and fit perfectly.

iS THE THROWOUT BEARING INCLUDED?

Very quick service and lowest price.

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy