My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-1142 Upper Pinion Bearing for MercruiserStern Drives

Manufacturer

Picture for manufacturer Sierra

Part Number

18-1142
12 reviews
Sale Price

$35.18

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 18-1142 Upper Pinion Bearing is a high-quality aftermarket replacement bearing designed for MercruiserStern Drive systems. Engineered to meet or exceed original equipment manufacturer (OEM) standards, this bearing delivers reliable performance in demanding marine environments.

Key Features:

  • Durable construction built to withstand the rigors of marine use
  • Non-corrosive materials for long-lasting performance in saltwater and freshwater environments
  • OEM-equivalent quality — manufactured to meet or exceed Mercury Marine specifications
  • Direct replacement for Mercury Marine OEM part number 31-32573A1 and GLM part number 21560
  • Compatible with I, R, MR, Alpha One, and Alpha One Gen II stern drives with a 1.50 / 1.47 gear ratio

OEM Cross-Reference Numbers:

  • Mercury Marine: 31-32573A1
  • GLM: 21560

The Sierra 18-1142 is part of Sierra's comprehensive line of marine stern drive components, making it a trusted choice for marine technicians and do-it-yourself boaters alike. Replace worn or damaged upper pinion bearings with confidence using this proven aftermarket solution.

Its online. Its easy. Duh

super easy amazon checkout.

Nice n easy fast no problems

great store

EASY TO NAVIGATE THE PAGE, FAST SHIPPING, OVERALL WONDERFULL TO DEAL WITH!!!! WILL SHOP THERE AGAIN!!!! THANK YOU!!!

Great prices and service. Quality parts for the best price online. Will be my first choice form now on.

I have no comment right now. 1st timer

Excellent low price, super fast shipping, and great communication. Top notch seller. Recommend highly!!

Web site very easy to use!

Easy process...but the picture of the item is nowhere near close. Shows an intake manifold instead of a cabin air filter.

Lowest price on Firestone bags I found. When I called to check on order was tread very well. Thank You...

It was quick and easy to purchase and very easy to find the item I was looking for

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