My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-3728 MerCruiser Rear Engine Mount Lock Nut

Manufacturer

Picture for manufacturer Sierra

Part Number

18-3728
13 reviews
Sale Price

$9.87

2 left at this price

delivery box

Usually delivered within 2 days

Check out with

ApplePay
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 18-3728 is a marine-grade lock nut engineered as a direct replacement for the MCM rear engine mount on MerCruiser stern drive systems. Built to meet OEM specifications, this fastener ensures a secure, vibration-resistant hold critical for proper engine mounting integrity.

Key Features:

  • Manufactured to meet or exceed OEM specifications for a precise, reliable fit
  • Designed for use on MerCruiser stern drive applications
  • Specifically sized for the MCM rear engine mount position
  • Interchangeable with GLM part number 19350

OEM Cross-Reference:

  • Replaces Mercury Marine: 11-863332
  • Replaces Mercury Marine: 11-99298

Sierra International is a trusted manufacturer of aftermarket marine parts, delivering quality components that keep your stern drive running reliably. The 18-3728 lock nut is an essential hardware item for engine mount service and maintenance on MerCruiser-equipped vessels.

price was great

?

So far good

Easy to find what I'm looking for.

Piece of cake very thorough. Like the Amazon parallel site usage!

Ez

Best prices and i found exactly what i needed and the appropriate information. The fifth star is for the fact that a regular search for the part of auto-parts did not reveal this website. Found via Google - which totally fine, but 2 sources of marketing are better than one.

Thanks

Very easy to work with.

Extremely Happy! Best price on the web, easy order tracking, if only all online orders from other sources were this easy. I ordered a component from another online retailer who showed parts "in stock" only to see my status as "sent to warehouse" and it was weeks. When Autoplicity shows "in stock" it really was and delivered right away.

Quick shipping on my order. Thanks

VERY GOOD

Overall very good, fast service. Will shop there again.

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