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HP/Liter Cyl. Beginning S/N Ending S/N Center Main Bearing Lower Main Bearing Upper Main Bearing Mallory Bearing
3.5 hp 1 ALL     18-1398 18-1398  
3.6 hp 1 ALL     18-1398 18-1398  
3.9 hp 1 ALL     18-1398 18-1398  
4 hp 1 2498136 A809600   18-1398 18-1398  
4 hp 2 5589202 & UP   18-1398    
4.5 hp 1 4107220 & UP   18-1398 18-1398  
6 hp 2 1916139 2529894   18-1398 18-1398  
6 hp 2 A197112 & UP   18-1397   9-75104
7.5 hp 2 2529895 & UP   18-1398 18-1398  
8 2 A197112 & UP   18-1397   9-75104
9.8 2 1865779 & UP   18-1398 18-1398  
9.9 2 A197112 & UP   18-1397   9-75104
15 2 B292414 & UP   18-1397   9-75104
20 2 1292910 6443972   18-1153 18-1153  
25 (KF 9) 4 377150 495761 18-4035      
30 (MK30) 4 ALL   18-4035      
30 4 1271885 1448139 18-4035 18-1154 18-1154
  • 9-51202
  • 9-51202
30 2 G053314 & UP   18-1154   9-51202
30 (jet) 4 C159200 & UP 18-4037 18-1154 18-1154
  • 9-51202
  • 9-51202
30 (jet) 3 G590000 & UP   18-1154   9-51202
35 4 121722 1448139 18-4035 18-1154 18-1154
  • 9-51202
  • 9-51202
35 2 6445653 B110788   18-1154   9-51202
35 (MK35) 4 1217222 1271884 18-4035      
25 (MK40) 4 711400 & UP 18-4035      
40 (MK50) 4 ALL   18-4035      
40 (MK55) 4 831021 & UP 18-4035      
40 4 1279685 1476509 18-4035 18-1154 18-1154
  • 9-51202
  • 9-51202
40 2 2874704 & UP   18-1154   9-51202
40 4 C159200 & UP 18-4037 18-1154 18-1154(4)
  • 9-51202
  • 9-51202
40 2 G053314 & UP   18-1154   9-51202
40 3 G531301 & UP   18-1154   9-51202
45 4 1476510 1531568 18-4035 18-1154 18-1154(4)
  • 9-51202
  • 9-51202
45 4 5531630 & UP 18-4037 18-1154 18-1154(4)
  • 9-51202
  • 9-51202
45 (jet)   D000750 G589999   18-1154   9-51202
45 (jet) 3 G590000 & UP   18-1154   9-51202
45 (MK58) 4 1139538 & UP 18-4035      
50 4 1421113 5193258 18-4035 18-1154 18-1154(4)
  • 9-51202
  • 9-51202
50 4 5193259 & UP 18-4037 18-1154 18-1154
  • 9-51202
  • 9-51202
50 3 6428681 D000749 18-4037      
50 3 D000750 G589999   18-1154   9-51202
50 3 G590000 & UP   18-1154   9-51202
55 3 D000750 G589999   18-1154   9-51202
55 3 G590000 & UP   18-1154   9-51202
60 4 1303411 1542744 18-4037 18-1154 18-1154(4)
  • 9-51202
  • 9-51202
60 3 6428681 D000749 18-4037      
60 3 D000750 G589999   18-1154   9-51202
60 3 G590000 & UP   18-1154   9-51202
65 4 1545745 3293183 18-4037 18-1154   9-51202
65 3 3293184 4571651 18-4037      
60 (MK75) 6 ALL   18-4037      
65 (jet)   D283222 & UP   18-1346   9-51200
70 (MK78) 6 1143038 & UP 18-4037      
70 6 1296411 1566239 18-4037 18-1154 18-1154(4)
  • 9-51202
  • 9-51202
70 3 4571652 6428680 18-4037      
70 3 A996142 & UP   18-1346   9-51200
75 4 6432901 & UP 18-4037 18-1154   9-51202
75 3 C222000 & UP   18-1346   9-51200
80 6 1335465 1566239 18-4037 18-1154 18-1154(4)
  • 9-51202
  • 9-51202
80 4 2559001 6432900 18-4037 18-1154   9-51202
85 I-6 1460999 1766823 18-4037 18-1154   9-51202
85 4 3493913 4831998 18-4037 18-1154   9-51202
90 I-6 1766824 1869775 18-4037 18-1154   9-51202
90 I-6 4845301 & UP 18-4037 18-1154   9-51202
90 3 A996142 & UP   18-1346   9-51200
95 I-6 1869776 2318585 18-4037 18-1154   9-51202
100 I-6 1464949 2836018 18-4037 18-1154   9-51202
100 I-6 2641855 3253111 18-4037 18-1154   9-51202
100 4 B209468 & UP   18-1346   9-51200
105 (jet) V-6 D820000 & UP   18-1345   9-51204
110 I-6 1870204 2314955 18-4037 18-1154   9-51202
115 I-6 2836019 C099999 18-4037 18-1154   9-51202
115 4 C100000 & UP   18-1346   9-51200
125 I-6 2314956 3253111 18-4037 18-1154   9-51202
125 4 D283222 & UP   18-1346   9-51200
135 I-6 2839369 3293233 18-4037 18-1154   9-51202
135 V-6 D082000 & UP   18-1345   9-51204
135 DFI V-6 D082000 & UP   18-1345   9-51204
140 I-6 3293234 & UP 18-4037 18-1154   9-51202
140 (jet) V-6 D082000 & UP   18-1345   9-51204
150 I-6 3502806 5327662 18-4037 18-1154   9-51202
150 V-6 4868998 A904645   18-1345   9-51204
150 DFI V-6 D082000 & UP   18-1345   9-51204
150 XR6 V-6 D082000 & UP   18-1345   9-51204
175 V-6 4301235 6608750   18-1345   9-51204
175 EFI V-6 D082000 & UP   18-1345   9-51204
200 V-6 4839034 D081999   18-1345   9-51204
200 V-6 D082000 & UP   18-1345   9-51204
200 EFI V-6 D082000 & UP   18-1345   9-51204
225 V-6 5628028 & UP   18-1345   9-51204
250 V-6 C101891 & UP 18-1347 18-1345   9-51204
275 V-6 C101891 & UP 18-1347 18-1345   9-51204
3.4L V-6 5611648 & UP 18-1347 18-1345   9-51204
HP/Liter Cyl. Beginning S/N Ending S/N Center Main Bearing Lower Main Bearing Upper Main Bearing Mallory Bearing
Notes:
(4) : 56 required per main bearing

$15.99 - Sierra 18-1153 Ball Bearing
Compare at $18.49
Part # 18-1153
$15.99 - Sierra 18-1154 Ball Bearing
Compare at $18.49
Part # 18-1154
$35.99 - Sierra 18-1196 Upper Main Bearing
Compare at $41.99
Part # 18-1196
$12.99 - Sierra 18-1398 Ball Bearing
Compare at $14.99
Part # 18-1398
$15.99 - Mallory Bearing 9-51202
Compare at $20.72
Part # 9-51202
Sierra
Mercury Upper Main Bearings
Sierra 18-1153 Ball Bearing
Replaces OEM part #
  • MERCURY MARINE 30-63326
  • MERCURY MARINE 30-63326T


Mariner Crankshaft Bearings
Sierra 18-1154 Ball Bearing
Replaces OEM part #
  • OMC 377139
  • MERCURY MARINE 30-63742
  • MERCURY MARINE 30-63742T


Mercury Upper Main Bearings 18-1196 Upper Main Bearing
Sierra 18-1196 Upper Main Bearing
Replaces OEM part #
  • MERCURY MARINE 31-74248T
  • For: V135, 150, 175, 200 (carb)

Mercury Upper Main Bearings 18-1398 Ball Bearing
Sierra 18-1398 Ball Bearing
Replaces OEM part #
  • MERCURY MARINE 30-72961
  • For: Mercury/Mariner 3.5 - 9.8 HP & Mercruiser belt driven water pump

mercury upper main bearings-mallory bearing 9-51202
Mallory Bearing 9-51202
Replaces GLM #:21860
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):30-63742T
Fits Application:115/140/150 inline 6cyl, 30/40/50/60/75/80 upper/lower main

This product typically leaves our warehouse in 1 business day.

To determine the shipping cost and estimated delivery date for this item click Add to Cart, then click Calculate Shipping inside your shopping cart.

General Policy

We work hard to provide you with the best value in product prices and shipping charges, and to get your order to you in a timely, safe, and convenient manner. Internet sales involve the cost of getting the product to you, and shipping carriers base that cost on the size and weight of the package, plus the distance the package travels from our warehouse to your door. We keep our product prices low, negotiate low shipping charges from our carriers and pass those savings on to you, and we don't charge sales tax (except for residents of Utah), so your order from iboats.com is the best value for all your boating needs.

Our standard shipping method is UPS ground, which typically takes 2-5 additional transit days after the order has left our warehouse, depending on your delivery address. We also offer other shipping options, including expedited delivery, and the actual delivery date will depend on the shipping options you choose.

Shipping to Canada

Most products sold by iboats.com can be purchased and shipped to Canada. Some restrictions apply to certain items, such as hazardous materials, over-weight products, and the method of shipping. Available product lines, shipping rates and fees may vary depending on the delivery address for your order.

Currently, iboats.com offers ground shipping to all Canada provinces. Our Canadian brokerage service accelerates your orders through the Customs clearance process and facilitates the delivery of your order through Canada Post or the best method based on your shipping address. We do not currently offer expedited shipping methods to Canada.

At iboats.com we want to simplify your transaction and give you a pleasing purchasing experience so you'll come shop with us again and again. We therefore calculate all the duties, taxes, and other fees specific to Canadian orders and show you the total landed cost of getting the order to your door. There are no hidden fees and will be no surprise COD charges when the package is delivered to you.

Order History & Tracking

We provide several methods to track your order and keep you informed of your order status and expected delivery date. After completing an iboats.com purchase transaction, an account will automatically be created for your provided email address. You'll receive an email from iboats.com Customer Service informing you of your new User Account and the many benefits it provides. If you don't wish to have an iboats.com Account with password, do nothing and your account won't be registered; however, you can respond to the instructions in the email and easily register your account and setup a password. This will allow you to sign in to your account by choosing the Order Status link from any iboats.com page, where you can browse your order history and track the status of all your orders - tracking numbers are displayed that link to the delivery carrier's tracking webpage.

If you have provided your email address during checkout, we will also email you your invoice, which includes a link for tracking your order and viewing the current status of your order. Refer to your invoice email and tracking link any time you wish to track the status of your order

Friendly Return Policy

  • If the merchandise you received was defective, damaged, or an error was made by iboats.com, simply return the merchandise within 30 days of the original shipping date for a full refund.
  • See the specific requirements and instructions below for United States or Canadian orders.

Returns for U.S. Customers

We want to make it as easy as possible for you to return an unwanted item; afterall, we want you to return again and again as a satisfied iboats.com customer, and to also continue recommending us to your friends.

As mentioned above, if the merchandise you received was defective, damaged, or an error was made by iboats.com, simply return the merchandise within 30 days of the original shipping date for a full refund. Merchandise must still be in brand-new, unused condition with all original packaging in good condition; plus parts, accessories, manuals, and/or warranty cards included. Please note that all return merchandise must be accompanied by an RA (Return Authorization) number issued by iboats.com. To receive your RA number simply call our Returns Department toll-free at 1-800-914-1123 or email us at returns@iboats.com.

If for some reason you need to return merchandise for reasons other than those mentioned above, follow the same procedures, obtaining an RA number from iboats.com, within 30 days of the original shipping date. Please note that there may be restocking fees, shipping costs, or product change order costs associated with some returns. Feel free to check with the iboats.com Returns Department for specific terms, conditions, and eligibility.

Returns for Canadian Customers

We request that all Canadian customers verify and re-check that the products you are ordering are what you want and are correct for your application or intended use. iboats.com does not accept any return merchandise on Canadian orders, unless the merchandise you received was defective, damaged, or an error was made by iboats.com. In such cases, return the merchandise within 30 days of the original shipping date for a full refund, following the procedures below.

Canadian orders involve many additional costs dealing with Customs, Provincial taxes, brokerage fees, and more, making product returns complicated and very expensive and costly for both the customer and iboats.com. Again, help us serve you best by verifying that the products you are ordering are what you want so we don't have any costly returns or have to deny a return.

If a return meets the criteria mentioned above, merchandise must still be in brand-new, unused condition with all original packaging in good condition; all parts, accessories, manuals, and/or warranty cards included. Please note that all return merchandise must be accompanied by an RA (Return Authorization) number issued by iboats.com. To receive your RA number call our Customer Service Department toll-free at 1-800-914-1123, Tuesday-Friday, 10am-7pm EST, or email us at returns@iboats.com. We will provide further details on where and how to mail the merchandise. Please note that returns sent from rural Canadian addresses may take up to five weeks to process after the package is mailed.

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