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Cover

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Sierra

Sierra Cover Assy

$135.99

Unit price

Sierra 18-4750 OMC Cover Assembly

Sierra high-quality engine parts are designed to meet OEM specifications.

Interchangeable With:

OMC Stern Drive

983967

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra 18-3899 Johnson Evinrude Water Cover Gasket

$10.99

Unit price

Sierra 18-3899 Water Cover Gasket

Sierra high-quality engine parts are designed to meet OEM specifications and are backed by Sierra's unmatched manufacturer's warranty.

For Use on Johnson/Evinrude Engines, For: 20,25, 25C, 30, 35

Interchangeable with:

GLM

33700

Johnson/Evinrude Outboard

327674

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Thermostat Cover Gasket - SIE-18-3675

$4.09

Unit price

Sierra 18-3675 Thermostat Cover Gasket

Sierra replacement thermostat cover gasket for Mercury Marine engines.

For: 200-250 Hp 3.0L, (DFI and EFI)

Interchangeable with:

Mercury Marine

27-850318

27-8503181

Mercury Sport Jet

27-8503181

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Cover Plate Gasket Priced Per Pkg Of 2

$8.79

Unit price

Cover Plate Gasket (Priced Per Pkg of 2)

Special Order est. 10 Days

Supersedes 18-2880

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra 18-2876-9 Bypass Cover Gasket (Priced Per Pkg Of 2)

$5.39

Unit price

Sierra Bypass Cover Gasket Priced Per Pkg of 2 Special Order est. 10 Days For use on Johnson/Evinrude outboard Included in Powerhead Gasket Sets 18-4301, 18-4309 Replaces: 307133

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Valve Cover Gasket - SIE-18-2845

$33.79

Unit price

Valve Cover Gasket for 5.0 & 5.7L Mercruiser, Volvo, OMC For V-8 Engines (305/350)CID 5.0,5.7L Replaces: Chris Craft - 16.11-01236 Mercury - 27-11999 OMC - 0912965 Mallory - 9-61300 Crusader - 91351 Pro Marine - 17930 Redline - RL2845

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Thermostat Cover Gasket Priced Per Pkg Of 2

$4.99

Unit price

Thermostat Cover Gasket (Priced Per Pkg of 2)

Special Order est. 10 Days

Supersedes 18-2831

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Push Rod Cover Gasket

$34.79

Unit price

Sierra 18-2815 Push Rod Cover Gasket for GM 3.0L

Sierra high-quality engine parts are backed by an unmatched Sierra manufacturer's warranty. For use with Mercruiser Stern Drives, OMC Stern Drives, and Volvo Penta engines.

Fits MCM 120/140 (4 cyl.) with stamped lifter side cover

Interchangeable with:

GLM

32640

Mallory

9-61312

Mercruiser Stern Drive

27-814703

FI5000199

FI5000119

OMC Stern Drive

913276

3852692

Volvo Penta

3852692

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Exhaust Cover Plate Gasket

$17.99

Unit price

Sierra 18-2741 Exhaust Cover Plate Gasket

For use on Mercury/Mariner Outboard Engines: 65 Jet, 75hp 3 cyl., 90hp 3cyl

Interchangeable with:

GLM

37650

Mercury Marine

27-43004-7

27-43004009

27-430045

27-430043

27-430042

27-430041

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Exhaust Cover Gasket

$8.39

Unit price

Sierra 18-2714 Mercury Exhaust Cover Gasket

This exhaust cover gasket is for use with 15-25HP 2 Cyl Mercury Outboards.

Interchangeable with:

Mercury

27-414992

27-414993

27-414994

27-414995

27-892157

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra 18-2573 Water Jacket Cover Gasket

$9.19

Unit price

Sierra 18-2573 Water Jacket Cover Gasket - Special Order est. 10 Days

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Thermostat Cover Gasket Priced Per 2Pk (SS 18-2554)

$16.59

Unit price

Sierra 18-2554-9 Mercruiser Thermostat Cover Gasket (Pkg Of 2)

Sierra replacement thermostat cover gasket for Mercruiser Stern Drives.

Fits: MCM/MIE GM V-6 & V-8 engines

Package of 2

Interchangeable with:

GLM

31630

Mallory

9-60006

Mercruiser Stern Drive

27-41812

27-41812B

27-41812Q

27-90556

Osco

41812

Supersedes 18-2554

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Thermostat Cover Gasket Priced Per Pkg Of 2 (SS 18-2553)

$6.39

Unit price

Sierra 18-2553-9 Thermostat Cover Gasket for Mercruiser Stern Drives (Pkg Of 2)

Sierra replacement Mercruiser thermostat cover gasket.

Fits: MCM/MIE GM V-6 & V-8 engines w/older style 2 piece thermostat housing

Package of 2

Interchangeable with:

GLM

31460

Mallory

9-60005

Mercruiser Stern Drive

27-47510

27-47510Q

Osco

47510

Supersedes 18-2553

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Water Jacket Cover Gasket Priced Per 2Pk (SS 18-2544)

$17.79

Unit price

Sierra 18-2544-9 Water Jacket Cover Gasket (Priced Per Pkg Of 2)

Special Order est. 10 Days

Replaces:

OMC

321028

Mallory

9-60452

GLM

34370

Pro Marine

763

Redline

RL2544

Supersedes 18-2544

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Exhaust Cover Gasket Priced Per 2Pk

$11.19

Unit price

Exhaust Cover Gasket (Priced Per Pkg of 2) - Special Order est. 10 Days

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Timing Cover Seal

$42.59

Unit price

Timing Cover Seal for most GM Based Engines - Special Order est. 10 Days Fits: 2.5L/153 CID 3.0L/181 CID I-6/230CID I-6/250CID 4.3L/V-6 5.0L/305 CID 5.7L/350 CID Replaces: Crusader 7080310 Mallory 9-61610 Mercury 59341A 1, 26-97335 OMC 3853341, 0508990 Volvo 3853341 Redline RL1213

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Thermostat Cover Gasket - SIE-18-1202

$7.49

Unit price

Sierra 18-1202 Thermostat Cover Gasket

Sierra Thermostat Cover Gasket is for use on Johnson/Evinrude Outboards.

Interchangeable with:

GLM

35440

Johnson/Evinrude Outboard

329830Curator

Low in stock

Available for pickup at

Out of stock at

{"id":50582395977986,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"SIE-18-0887","requires_shipping":true,"taxable":true,"featured_image":{"id":49428281229570,"product_id":10339380166914,"position":1,"created_at":"2026-10-03T22:32:10-04:00","updated_at":"2026-10-03T22:32:13-04:00","alt":"Sierra, Timing Cover Gasket","width":600,"height":600,"src":"\/\/allmarineworld.com\/cdn\/shop\/files\/SIE-18-0887_lg_1__71421.1558121132.jpg?v=1791081133","variant_ids":[50582395977986]},"available":true,"name":"Sierra Timing Cover Gasket","public_title":null,"options":["Default Title"],"price":639,"weight":31,"compare_at_price":null,"inventory_management":"shopify","barcode":"030999755186","featured_media":{"alt":"Sierra, Timing Cover Gasket","id":46596074471682,"position":1,"preview_image":{"aspect_ratio":1.0,"height":600,"width":600,"src":"\/\/allmarineworld.com\/cdn\/shop\/files\/SIE-18-0887_lg_1__71421.1558121132.jpg?v=1791081133"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}

Sierra

Sierra Timing Cover Gasket

$6.39

Unit price

Sierra 18-0887 Timing Cover Gasket

Sierra replacement timing cover gasket for 4 & 6 cylinder engines.

Fits MCM 120/2.5L, 140/3.0L/LX & 160/165 (6 cylinder) (1963 & up)

Interchangeable with:

GLM

30360

Mallory

9-61602

Mercruiser Stern Drive

27-49953

27-34216

FI5000201

OMC Stern Drive

912988

913275

3852691

Volvo Penta

3852691

Yamaha Outboard

YSG-14096-15-6G

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Thermostat Cover Gasket Priced Per 2Pk

$4.79

Unit price

Sierra 18-0878-9 Thermostat Cover Gasket (Priced Per Pkg Of 2)

- Special Order est. 10 Days

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra 18-0844 Yamaha Thermostat Cover Gasket

$5.59

Unit price

Sierra 18-0844 Thermostat Cover Gasket

Sierra replacement thermostat cover gasket for Yamaha Outboards.

Interchangeable with:

Mallory

9-60003

Yamaha Outboard

688-12414-A1-00

688-12414-00-00

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Water Jacket Cover Gasket - SIE-18-0767

$25.39

Unit price

Water Jacket Cover Gasket - Special Order est. 10 Days

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra 18-0685 Valve Cover Gasket Replaces 27-73666

$50.59

Unit price

Sierra 18-0685 Mercruiser Valve Cover Gasket

Sierra high-quality engine parts are designed to meet OEM specifications. Fits MCM 3.7L engines (1976-1989).

Interchangeable with:

GLM

31820

Mallory

9-61313

Mercruiser Stern Drive

27-73666

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Valve Cover Gasket - SIE-18-0664

$36.09

Unit price

Valve Cover Gasket for 5.0/5.7L GM Engines - Special Order est. 10 Days For GM 305/350, 5.0 & 5.7L Replaces: Crusader 7231330 Mallory 9-61305 Mercury 27-17467 OMC 3852687 Volvo 3852687 Aqua Power 1219 GLM 30357

Low in stock

Available for pickup at

Out of stock at

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Sierra

Sierra Valve Cover Gasket - SIE-18-0347

$20.59

Unit price

Sierra 18-0347 Valve Cover Gasket for 2.5 & 3.0L Mercruiser, Volvo, OMC

Sierra high-quality replacement engine parts are designed to meet OEM specifications. For GM 153 & 181 CID (2.5L & 3.0L)

Interchangeable with:

GLM

32210

Mallory

9-61317

Mercruiser Stern Drive

27-52145

27-806452

27-34041

OMC Stern Drive

913277

912981

3852693

Volvo Penta

3852693

Low in stock

Available for pickup at

Out of stock at

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