Refine Parts List
Model/ HP :

Model/ HP

Cyl.

Beg. S/N

End. S/N

Sierra Head Gasket

4 HP (4 stroke) 1 OR000001 & UP 18-3844
5 HP (4 stroke) 1 OR000001 & UP 18-3844
6 HP (4 stroke) 1 OR000001 & UP 18-3844
25 HP (4 stroke) 2 OG760300 & UP 18-3846
40 HP (4 stroke) 4 OG760300 & UP 18-3845
45 HP (4 stroke) 4 OG760300 & UP 18-3845
50 HP (4 stroke) 4 OG760300 & UP 18-3845
105 JET 6 D082000 & UP 18-3864
V-135 V-6 A904646 C239552 18-3863
V-135 V-6 C239553 G960499 18-3861
140 JET V-6 D082000 G960499 18-3864
V-150 V-6 6042946 C239552 18-3863
V-150 V-6 C239553 G960499 18-3861
V-150 XR4 MAGIII V-6 B242885 C239552 18-3862
V-150 XR4 V-6 C239553 D081999 18-3871
V-150 EFI XR6MAGIII V-6 D082000 G960499 18-3864
150 MAR V-6 6038681 C239553 18-3863
150 MAR V-6 C239554 & UP 18-3861
V-175 V-6 6618751 C239552 18-3862
V-175 V-6 C239553 D081999 18-3871
V-175 V-6 D082000 G960499 18-3864
V-175 XRI EFI V-6 D000750 D081999 18-3871
V-175 XRI EFI V-6 D000750 D081999 18-3864
V-175 XRI EFI V-6 D082000 G303045 18-3864
V-200,200,2000 V-6 4839034 6073191 18-3872
V-200 V-6 6073192 6203990 18-3872
V-200 (EFI) V-6 OC100861 OC291519 18-3862
V-200 (EFI) V-6 OC291520 OG960499 18-3862
V-200 (2.4L) V-6 6203991 C291519 18-3862
V-200 (2.5L) V-6 C291520 & UP 18-3864
V-200 XRI EFI V-6 C100861 C291519 18-3862
V-200 XRI EFI V-6 C291520 & UP 18-3864 (2)
V-220 V-6 B117316 & UP 18-3862
V-225 V-6 5628028 D280812 18-3872
V-225 V-6 OD280813 & UP 18-7400
V-225 SEA PRO V-6 OG245605 OT408999 18-7400
V-225 EFI (3.0L) V-6 OG129222 OG760299 18-7400
V-250 EFI (3.0L) V-6 OG129222 OT408999 18-7400

Model/ HP

Cyl.

Beg. S/N

End. S/N

Sierra Head Gasket

Notes:
  • (2) : 2 head gaskets required
Refine Parts List
Model/ HP :
Price: $27.99
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Part # 18-3804
2nd Day Air for $2 More Eligible
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Price: $31.99
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Part # 18-3827
2nd Day Air for $2 More Eligible
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Part # 18-3828
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Part # 18-3844
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Price: $69.98
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Part # 18-3845
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Price: $29.99
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Part # 18-3861
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Price: $24.99
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Part # 18-3862
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Part # 18-3863
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Part # 18-3864
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Price: $34.00
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Part # 18-3871
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Part # 18-3872
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Price: $6.83
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Part # 18-0372
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Part # 18-2500-9
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Part # 18-2504-9
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Part # 18-2505-9
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Part # 18-2507-9
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Part # 18-2740
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Part # 18-2805-9
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Price: $14.08
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Part # 18-2806-9
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Price: $19.98
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Part # 18-2807-9
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Price: $7.99
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Part # 18-2808-9
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Part # 18-2809-9
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Part # 18-2810-9
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Price: $4.99
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Part # 18-2837-9
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Price: $14.99
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Part # 18-2943
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Mercury 150 / 175 Hp V6 2.0L Head Cover Gasket
Price: $2.01
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Part # 505-40
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Mercury 150 Hp Head Cover Gasket
Price: $2.13
(Out of stock)
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Part # 505-37
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(Out Of Stock)
Mercury 50 / 60-70 Hp 3 Cylinder Head Gasket
Price: $3.76
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Part # 505-25
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Mercury 40 / 50 Hp 4 Cylinder Head Gasket
Price: $3.74
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Part # 505-30
2nd Day Air for $2 More Eligible
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Mercury 150 / 175 / 200 Hp 2.4L Head Gasket
Price: $16.21
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(18% Off $19.95)
Part # 505-42
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Mercury 150 / 175 Hp V6 2.0L Head Gasket
Price: $18.66
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(18% Off $22.96)
Part # 505-39
Mercury 2.5L DFI Head Gasket
Price: $54.21
Save: $12.51
(18% Off $66.72)
Part # 505-41
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Cyliner Head Gasket - 18-60916 - Sierra
Price: $25.53
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Part # 18-60916
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Sierra
Average Customer Review for Mry Head Gasket V6 - 18-3862 - Sierra
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Wrong 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.
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Average Customer Review for Head Gasket - 18-3863 - Sierra
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Head 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)
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Fast 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.
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Water 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
(1 of 1 people found this review helpful)
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Average Customer Review for Mercury 150 / 175 Hp V6 2.0L Head Gasket
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product as described
by Jeff from Mountain City, Tennessee on October 12, 2015
Item was received before expected arrival date.
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Average Customer Review for Mercury 2.5L DFI Head Gasket
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1998 optimax 135hp
by Steve from Winnipeg, Manitoba on June 06, 2016
Replace 1 of my 2.5l dfi optimax head gaskets with this product, running great with no issues since install aprox 6 hours over 2 different trips. So far its been a great alternative to the very expensive oem head gasket. Keep in mind it is a metal replacement and not the composite oem material. I will post a second review at the end of the season to let you all know how it held up. I have also contacted wsm the maker of the product and they assured me that the metal gasket was treated to prevent dissimilar metal corosion between it and the aluminim block and head
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Q:
Will this part fir my mercury outboard 135hp serial number OD222525?
A:
Yes this will work for your motor.


Q:
Why are there 2 gaskets in the package?
A:
Yes, the "18-2807-9" comes 2 per pack.


Q:
Will this fit my 1985 mariner 150 ser a167977?
A:
No it is part number 18-3863.


Q:
Is replacing this gasket something a consumer can do?
A:
Replacing a head gasket is a DIY project. You will want to follow a repair manual, but basic idea is to remove the cylinder head cover and scrape out the old gasket. If you have more technical questions you should contact a dealer or you can post a question in our forums at http://forums.iboats.com/


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