Internal Engine | Mercruiser Engine

Z6_GHK6HJC0OG6S20Q8HU3K6R0G63

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Gasket, Head Set

GM 2.5L 3.0L 4cyl 1983-1995 w/Large Ex Port Head

Item#:

96429

Cross Reference#:

17200
34604
34604A1
34604A2
96429A1

Manufacturer Item:

96429A1

Manufacturer:

Mercury Marine

Available:

In Stock

Your Price:

207.99

Each

Qty:

Gasket, Valve Cover

GM 2.5L 3.0L 4cyl 1972-Up

Item#:

806452

Cross Reference#:

FI5000198
0025101
0025101
17900
18-0347
34041
3852693
52145
778102
806452
851040
912981
913277

Manufacturer Item:

806452

Manufacturer:

Mercury Marine

Available:

In Stock

Your Price:

43.49

Each

Qty:

Gasket, Idle Air Control

GM V6 & V8 MPI

Item#:

863112

Cross Reference#:

8M0119616
863112

Manufacturer Item:

863112

Manufacturer:

Mercury Marine

Available:

In Stock

Your Price:

3.09

Each

Qty:

Timing Cover

GM 4.3L V6 w/Steel Cover 1998-1992

Item#:

4.3STC

Cross Reference#:

FI1100540
FI1101040
FI1101088
FI1101180
FI1101333
F3991433
F6269296
13613
14249
14249A1
14249A2
54796
54798
58208
58215
60656
60656A1
60660A1
72648
75612
8M0127828

Manufacturer Item:

14249A2

Manufacturer:

Pro Marine

Available:

In Stock

Your Price:

34.17

Each

Qty:

Timing Cover , Composite

GM 4.3L V6 wo/Sensor 1996-Up

Item#:

4.3CTC

Cross Reference#:

18-4512
3855735
809893
809893T

Manufacturer Item:

809893

Manufacturer:

Pro Marine

Available:

Out of Stock

Your Price:

144.45

Each

Qty:

Timing Cover Composite

GM 4.3L V6 w/Sensor 1996-Up

Item#:

4.3CTCS

Cross Reference#:

18-4511
8M0069799
888777001

Manufacturer Item:

888777001

Manufacturer:

Pro Marine

Available:

In Stock

Your Price:

249.56

Each

Qty:

Harmonic Balancer

GM 7.4L Gen V & VI 1996-2000

Item#:

850461

Cross Reference#:

8M0082186
850461001

Manufacturer Item:

8M0082186

Manufacturer:

Mercury Marine

Available:

In Stock

Your Price:

1304.99

Each

Qty:

Oil Pump Screen

GM 305/5.0L & 350/5.7L w/5/8" Tube & Std 4Qt Oil Pan

Item#:

2-GMOPS58SP

Manufacturer Item:

N/A

Manufacturer:

Felpro

Available:

Out of Stock

Your Price:

18.86

Each

Qty:

Mercury MerCruiser Oil Drain Plug O-Ring 863006

OEM Oil Drain Plug Seal for Mercury & MerCruiser Engines

OEM Mercury & MerCruiser Oil Drain Plug Seal

Mercury MerCruiser Oil Drain Plug O-Ring 863006

The Mercury MerCruiser 863006 Oil Drain Plug O-Ring is an OEM replacement seal used across a wide range of Mercury outboards, Verado engines, MerCruiser sterndrives, and inboard marine engines.

This O-ring seals the oil drain plug assembly and helps prevent oil leaks during operation and after routine oil service.

Fitment Overview

OEM part number 863006 is used across numerous Mercury and MerCruiser oil drain plug applications. Unlike the drain plug assembly itself, this seal is shared across multiple engine families and marine platforms.

This includes Mercury EFI outboards, Verado engines, V6/V8/V10 outboards, MerCruiser sterndrive engines, and select inboard marine engines.

Compatibility

Application	Models / Engine Families
Mercury EFI 4-Stroke Outboards	65HP through 150HP EFI models
Mercury V6 Outboards	3.4L V6 175HP and 200HP
Mercury V8 Outboards	4.6L V8 200HP through 300HP
Mercury V10 Outboards	350HP 400HP 425HP models
Mercury Racing	300R 450R 500R Verado applications
MerCruiser Sterndrive Engines	Multiple GM-based marine engine platforms
MerCruiser Inboard Engines	Select inboard oil drain plug applications

Always verify fitment using your engine serial number or existing part number before ordering.

Associated Oil Drain Plug Assemblies

Important: If your oil drain plug assembly is cracked, damaged, stripped, or leaking around the housing itself, replacing only the O-ring may not solve the problem.

In those cases, replacing the complete drain plug assembly is recommended:

View Mercury 8M0112869 Oil Drain Plug Assembly

Part Numbers and Cross References

Type	Part Number
Mercury OEM	863006
Associated Drain Plug Assembly	8M0112869
Related Drain Plug Assemblies	8M0064964, 8M0045813

What This O-Ring Is Used For

This O-ring seals the oil drain plug assembly to prevent oil leaks and seepage. Over time, heat cycles, oil exposure, and repeated removal during oil changes can flatten or damage the seal.

Seals engine oil drain plug assemblies
Helps prevent oil leaks after service
OEM Mercury and MerCruiser replacement seal
Often replaced during routine oil maintenance

Replacing the O-ring during oil service is often the easiest and most affordable way to prevent future leaks.

System Function and Connections

System Type: Engine lubrication / oil drain system
Component Type: Oil drain plug O-ring seal
Associated Components: Oil drain plug assemblies and oil pan drain systems
Location: Oil drain plug sealing surface

FAQ

What does the 863006 O-ring fit?
It fits many Mercury and MerCruiser oil drain plug applications including EFI outboards, Verado engines, V6/V8/V10 outboards, and select sterndrive and inboard engines.

Can I replace just the O-ring instead of the entire drain plug assembly?
Yes. If the drain plug assembly itself is still in good condition and only the seal is leaking, replacing the O-ring is often the simplest repair.

When should I replace the full drain plug assembly?
Replace the entire assembly if the plug is cracked, stripped, damaged, or leaking around the plug body itself.

What drain plug assembly commonly uses this O-ring?
One common associated assembly is the Mercury 8M0112869 Oil Drain Plug Assembly .

Dealer Discounts & Store Policies

Dealer / Marine Industry Discounts

Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.

Apply for a Dealer Account

Shipping Policy

Free shipping on orders over $100 (continental U.S.).
Orders ship via UPS, USPS, and FedEx.
Orders received before 5:30 PM EST ship the same business day.
Typical delivery time is 1–5 business days.

30-Day Return Policy

Returns accepted within 30 days of delivery.
Items must be new, unused, and in original packaging.
Return authorization is required before sending items back.

Need help with a return or order question?
Contact Us
Phone: 941-721-3000

Searchable Part Numbers

863006, Mercury oil drain plug o-ring, Mercury oil plug seal, MerCruiser oil drain seal, Mercury Verado oil plug o-ring, Mercury V6 oil seal, Mercury V8 oil drain plug seal, Mercury V10 oil plug seal, 8M0112869, Mercury oil drain plug gasket

Item#:

863006

Manufacturer Item:

863006

Manufacturer:

Mercury Marine

Available:

In Stock

Your Price:

2.59

Each

Qty:

O Ring, Pump Base/Seal Carrier

Mercury 6-150 & R/MR/ Alpha I Force 9.9-15 SportJet 90-120

Item#:

7162P

Cross Reference#:

0302337
0302377
0777938
18-7162
302337
302377
32424
33145
3852044
508491
777938
8M0214923
82260
9-76547

Manufacturer Item:

33145

Manufacturer:

Engineered Marine Parts

Available:

In Stock

Your Price:

3.09

Each

Qty:

Timing Cover, GM

Mercrusier Small Block V8 1991 & Up

Item#:

835005

Cross Reference#:

835005

Manufacturer Item:

835005

Manufacturer:

Mercruiser

Available:

Special Order

Your Price:

118.92

Each

Qty:

Ring Set .020

GM 4cy V6 & V8 2@5/64" 1@3/16" Thick

Item#:

36217

Cross Reference#:

FI1100387
FI1100783
FI1101134
18-3939
3853477
48344
66217
67125
912093

Manufacturer Item:

66217

Manufacturer:

Pro Marine

Available:

In Stock

Your Price:

30.29

Each

Qty:

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