FINAL DAYS for Labor Day Sale Savings! Upgrade to 2nd Day Air for only $2 more*

Mercury Head Gaskets

Refine Parts List
Model/ HP

(4 to 250)

Model/ HP

Cyl.

Beg. S/N

End. S/N

Sierra Head Gasket

Mallory Head Gasket

4 HP (4 stroke)1OR000001& UP18-3844 -
5 HP (4 stroke)1OR000001& UP18-3844 -
6 HP (4 stroke)1OR000001& UP18-3844 -
25 HP (4 stroke)2OG760300& UP18-3846-
40 HP (4 stroke)4OG760300& UP18-3845 -
45 HP (4 stroke)4OG760300& UP18-3845 -
50 HP (4 stroke)4OG760300& UP18-3845 -
105 JET6D082000& UP18-3864 9-63854
V-135V-6A904646C23955218-3863 9-63855
V-135V-6C239553G96049918-3861 9-63851
140 JETV-6D082000G96049918-3864 9-63854
V-150V-66042946C23955218-3863 9-63855
V-150V-6C239553G96049918-3861 9-63851
V-150 XR4 MAGIIIV-6B242885C23955218-3862 9-63853
V-150 XR4V-6C239553D08199918-3871 9-63856
V-150 EFI XR6MAGIIIV-6D082000G96049918-3864 9-63854
150 MARV-66038681C23955318-3863 9-63855
150 MARV-6C239554& UP18-3861 9-63851
V-175V-66618751C23955218-3862 9-63853
V-175V-6C239553D08199918-3871 9-63856
V-175V-6D082000G96049918-3864 9-63854
V-175 XRI EFIV-6D000750D08199918-3871 9-63856
V-175 XRI EFIV-6D000750D08199918-3864 9-63854
V-175 XRI EFIV-6D082000G30304518-3864 9-63854
V-200,200,2000V-64839034607319118-3872 9-63852
V-200V-66073192620399018-3872 9-63852
V-200 (EFI)V-6OC100861OC29151918-3862 9-63853
V-200 (EFI)V-6OC291520OG96049918-3862 9-63853
V-200 (2.4L)V-66203991C29151918-3862 9-63853
V-200 (2.5L)V-6C291520& UP18-3864 9-63854
V-200 XRI EFIV-6C100861C29151918-3862 9-63853
V-200 XRI EFIV-6C291520& UP18-3864(2) 9-63854
V-220V-6B117316& UP18-3862 9-63853
V-225V-65628028D28081218-3872 9-63852
V-225V-6OD280813& UP18-7400 -
V-225 SEA PROV-6OG245605OT40899918-7400 -
V-225 EFI (3.0L)V-6OG129222OG76029918-7400 -
V-250 EFI (3.0L)V-6OG129222OT40899918-7400 -

Model/ HP

Cyl.

Beg. S/N

End. S/N

Sierra Head Gasket

Mallory Head Gasket

Notes:
(2) : 2 head gaskets required
Refine Parts List
Model/ HP

(4 to 250)
Blowout
Save 30%-41% Off.
Your Price: $28.99
Save: $6.50
(18% Off $35.49)
Part # 18-3804 ValueShip™ Eligible
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-84733M
  • MERCURY MARINE 27-19138M
  • MERCURY MARINE 27-19138
  • YAMAHA 689-W0001-A1-00
  • YAMAHA 689-11181-02-00
    For: Mercury/Mariner Model 30A; S/N Code 689
Your Price: $30.99
Save: $7.79
(20% Off $38.78)
Part # 18-3827 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-8254821
  • YAMAHA 6G8-11181-A1-00
  • YAMAHA 6G8-11181-00-00

  • For: Mercury/Mariner 8, 9.9 HP 4-Stroke
Your Price: $14.99
Save: $3.46
(18% Off $18.45)
Part # 18-3828 ValueShip™ Eligible
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-98990M
  • MERCURY MARINE 27-83899M
  • MERCURY MARINE 27-18937M
  • MERCURY MARINE 27-18937
  • YAMAHA 6E7-11181-A1-00
  • YAMAHA 6E7-11181-00-00
    For: Mercury/Mariner Model 9.9C;S/N Code 682 & Model 15C, S/N Code 684
Your Price: $20.99
Part # 18-3844 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-803508

  • For: Mercury/Mariner 4-Stroke O/B's, 4/5/6 HP S/N OR000001 & up
Your Price: $69.99
Part # 18-3845 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-825032

  • For: Mercury/Mariner 4-Strokes O/B's, 40/45/50 HP S/N OG760300 & up
Your Price: $30.99
Save: $5.45
(14% Off $36.44)
Part # 18-3861 ValueShip™ Eligible
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-18785-1

  • For: Mercury/Mariner Model 135,150,and XR4
Your Price: $25.99
Save: $5.18
(16% Off $31.17)
Part # 18-3862 ValueShip™ Eligible
Replaces OEM part #
  • MERCURY MARINE 27-41246-1

  • For: Mercury/Mariner Model 175, 200, XR4
Your Price: $24.99
Save: $5.24
(17% Off $30.23)
Part # 18-3863 ValueShip™ Eligible
Replaces OEM part #
  • MERCURY MARINE 27-96542-1

  • For Mercury/Mariner Model 150
Your Price: $31.99
Save: $6.94
(17% Off $38.93)
Part # 18-3864 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-822844-1

  • For: Mercury/Mariner Model 175, 200 and XR6
Your Price: $34.99
Save: $7.96
(18% Off $42.95)
Part # 18-3871 ValueShip™ Eligible
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-18786-1

  • For: Mercury/Mariner Model 175, XR4, Mag 11
Your Price: $38.99
Save: $8.85
(18% Off $47.84)
Part # 18-3872 ValueShip™ Eligible
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-41245-1

  • For:Mercury/Mariner 200 and 225 HP
Your Price: $6.99
Part # 18-0372 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-78410
Your Price: $12.99
Part # 18-2500-9 ValueShip™ Eligible
Replaces OEM part #
  • MERCURY MARINE 27-85493
Pkg. of 2
Your Price: $9.99
Save: $2.71
(21% Off $12.70)
Part # 18-2504-9 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-88449
  • Pkg. of 2
Your Price: $18.99
Part # 18-2505-9 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-96171-1
  • Pkg. of 2
Your Price: $9.99
Save: $3.41
(25% Off $13.40)
Part # 18-2507-9 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-85487
  • PKG. of 2
Your Price: $11.99
Save: $2.69
(18% Off $14.68)
Part # 18-2740 ValueShip™ Eligible
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-43005-7
  • For: 65 Jet, 75 HP 3 cyl, 90 HP 3 cyl.
Your Price: $7.99
Save: $1.44
(15% Off $9.43)
Part # 18-2805-9 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-85490-2
  • Pkg. of 2
Your Price: $14.99
Part # 18-2806-9 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-65788
  • Pkg. of 2
Your Price: $19.99
Save: $4.39
(18% Off $24.38)
Part # 18-2807-9 ValueShip™ Eligible
Replaces OEM part #
  • MERCURY MARINE 27-98185-3
Pkg. of 2
Your Price: $7.99
Save: $2.37
(22% Off $10.36)
Part # 18-2808-9 ValueShip™ Eligible
Replaces OEM part #
  • MERCURY MARINE 27-96278
  • Pkg. of 2
Your Price: $14.99
Save: $3.83
(20% Off $18.82)
Part # 18-2809-9 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-43779-2
  • Pkg. of 2
Your Price: $17.99
Save: $4.60
(20% Off $22.59)
Part # 18-2810-9 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-43777-2
  • Pkg. of 2
Your Price: $4.99
Save: $3.27
(39% Off $8.26)
Part # 18-2837-9 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-41382
Pkg. of 2
Your Price: $15.99
Save: $2.58
(13% Off $18.57)
Part # 18-2943 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces OEM part #
  • MERCURY MARINE 27-44328-4
    For: 81 Jet, 100 HP, 115 HP, and 125 HP 4 cyl. outboards
Mallory Gasket, Cylinder head 9-63964
Fall Sale Price: $21.70
Save: $15.14
(41% Off $36.84)
Part # 9-63964 ValueShip™ Eligible
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
Replaces GLM #:34910
Replaces Original Equipment Manufacturer(OEM):Yamaha
Replaces Original Equipment Manufacturer # (OEM #):6G8-11181-A1
Fits Application:9.9 4-stroke
Mallory Gasket, Cylinder Head 9-63856
Fall Sale Price: $24.60
Save: $16.82
(40% Off $41.42)
Part # 9-63856 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces GLM #:35890
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):27-18786-1
Fits Application:175, XR4, MAG II
Mallory Gasket, Cylinder Head 9-63852
Fall Sale Price: $27.43
Save: $18.98
(40% Off $46.41)
Part # 9-63852 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces GLM #:35900
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):27-41245-1
Fits Application:200, 225
Mallory O-Ring, Cylinder Head 9-63850
Fall Sale Price: $2.86
Save: $1.25
(30% Off $4.11)
Part # 9-63850 ValueShip™ Eligible
No Reviews  |  Write Review  |  Ask Question
Replaces Original Equipment Manufacturer(OEM):Mercury
Replaces Original Equipment Manufacturer # (OEM #):25-818573
Fits Application:200-300 EFI, DFI, & Carb
Yamaha 9.9 / 15 Hp Cylinder Head Gasket
Your Price: $11.81
Save: $2.00
(14% Off $13.81)
Part # 506-30
No Reviews  |  Write Review  |  Ask Question
    Yamaha:
  • 6E7-11181-A1
Merc. Vertical Reed Block Housing Gkt.
Your Price: $4.26
Save: $0.71
(14% Off $4.97)
Part # 516-26
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-93536-1
Mercury 150 / 175 Hp V6 2.0L Head Cover Gasket
Your Price: $2.67
Save: $0.45
(14% Off $3.12)
Part # 505-40
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-65788
Mercury 150 Hp Head Cover Gasket
Your Price: $2.24
Save: $0.29
(11% Off $2.53)
Part # 505-37
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-96278
Mercury 50 / 60-70 Hp 3 Cylinder Head Gasket
Your Price: $5.00
Save: $0.84
(14% Off $5.84)
Part # 505-25
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-43779-2
Mercury 40 / 50 Hp 4 Cylinder Head Gasket
Your Price: $3.94
Save: $0.66
(14% Off $4.60)
Part # 505-30
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-43777-2
Mercury 150 / 175 / 200 Hp 2.4L Head Gasket
Your Price: $17.07
Save: $2.88
(14% Off $19.95)
Part # 505-42
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-41246-1
Mercury 150 Hp 2.0L Vertical Reeds Head Gasket
Your Price: $21.36 (Out of stock)
Save: $3.61
(14% Off $24.97)
Part # 505-36
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-96542-1
Mercury 175 / 200 Hp 2.5L Head Gasket
Your Price: $19.43
Save: $3.27
(14% Off $22.70)
Part # 505-45
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-822844-1
Johnson/Evinrude 120-140 Hp V4 Looper Big Bore Head Gasket
Your Price: $14.26
Save: $2.41
(14% Off $16.67)
Part # 505-10
No Reviews  |  Write Review  |  Ask Question
    OMC:
  • 340115
Mercury 150 / 175 Hp V6 2.0L Head Gasket
Your Price: $19.64
Save: $3.32
(14% Off $22.96)
Part # 505-39
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-79583-1
Mercury 2.5L DFI Head Gasket
Your Price: $57.07
Save: $9.64
(14% Off $66.71)
Part # 505-41
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-852520-3
Mercury V6 2.5L High Performance EFI Head Gasket
Your Price: $28.50
Save: $3.00
(9% Off $31.50)
Part # 505-47
No Reviews  |  Write Review  |  Ask Question
    Mercury:
  • 27-814658 1
Cyliner Head Gasket - 18-60916 - Sierra
Your Price: $26.07
Save: $4.35
(14% Off $30.42)
Part # 18-60916 ValueShip™ Eligible
Hurry! Only 1 left in stock
No Reviews  |  Write Review  |  Ask Question
Replaces OEM Part #:
  • Mercury 27-850836001
  • Nissan/Tohatsu 3V1-01005-0
Sierra
Average Customer Review for Mry Head Gasket V6 - 18-3862 - Sierra
Full StarFull StarFull StarEmpty StarEmpty Star Based On 1 Review | Write Review
Full StarFull StarFull StarEmpty StarEmpty StarWrong head gasket.
by Eddie from Opelousas, Louisiana on August 10, 2015
I didn't contact you about the gasket because it wasn't entirely your fault.I think it was Sierra's fault . My problem was that I ordered the 18-3862 gasket and I was sent the 18-3861 gasket,but I had open the pack and tried to installed it before I realized it.Then I checked the numbers on the gasket.It was packed by Sierra. So I was stucked.That's all I can say about the order.
Was this review helpful?
Average Customer Review for Head Gasket - 18-3863 - Sierra
Full StarFull StarFull StarFull StarFull Star Based On 1 Review | Write Review
Full StarFull StarFull StarFull StarFull StarHead gasket
by Richard from new Haven, Illinois on June 09, 2011
Havent used these yet.. But look like good quality
(0 of 1 people found this review helpful)
Was this review helpful?
Full StarFull StarFull StarFull StarFull Star Based On 1 Review | Write Review
Full StarFull StarFull StarFull StarFull StarFast delivery
by Gary from Memphis, Indiana on May 30, 2011
Fast delivery and very well packaged. I was concerned the gasket would be bent or broken during delivery but it was shipped with a cardboard backer inside a box. The gasket worked great.
Was this review helpful?
Full StarFull StarFull StarFull StarFull Star Based On 1 Review | Write Review
Full StarFull StarFull StarFull StarFull StarWater jacket Gaskets
by Richard from new Haven, Illinois on June 09, 2011
havent used these yet.. But they look like good quality and there are 2 in a package.. I thought there was 1.. .. Good buy
Was this review helpful?
Q:
Why are there 2 gaskets in the package?
A:
Yes, the "18-2807-9" comes 2 per pack.
Ask a question for
Question & Answer Guidelines
This product ships in 1 to 3 business days.
Add to Cart and enter your Postal Code to determine the shipping charges and estimated delivery date.
Most products and orders leave our warehouse in 1 business day. However, select items may take more processing time. Alaska and Hawaii orders please add 1 additional warehouse processing day.
Standard Shipping Policies
End of Summer Savings During our Huge Fall Boatful of Savings Sale - Stock Up Now & Save!