Powerhead Base Gasket – Fits Johnson/Evinrude 40-60 HP (Replaces 326468, 351018)
Powerhead Base Gasket – Fits Johnson/Evinrude 40-60 HP (Replaces 326468, 351018) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Powerhead Base Gasket – Fits Johnson/Evinrude 40-60 HP (Replaces 32...
Product Details
This Powerhead Base Gasket creates a reliable seal between the powerhead and adapter plate on a wide range of Johnson and Evinrude 40, 50, and 60 HP 2-stroke outboard motors manufactured between 1976 and 2002. It prevents exhaust and water leaks, ensuring proper engine performance and longevity.
It is a direct replacement for multiple OEM and aftermarket part numbers, including Johnson/Evinrude 326468 and 351018, Sierra 18-0128, GLM 35340, and BRP 778187.
- Installation Location: Mounts directly between the powerhead assembly and the exhaust housing adapter plate.
- Material: Engineered from high-quality gasket material to withstand marine engine conditions.
- Function: Provides a critical seal to prevent compression loss and coolant/exhaust leaks.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number | Notes |
|---|---|---|
| Johnson/Evinrude | 351018 | Current OEM part number. Supersedes 326468, 321510, and 315852. |
| Johnson/Evinrude | 326468 | Superseded by 351018. |
| Johnson/Evinrude | 321510 | Superseded by 326468. |
| Johnson/Evinrude | 315852 | Superseded by 321510. |
| BRP | 778187 | Alternative OEM reference. |
| Sierra | 18-0128 | Direct aftermarket replacement. |
| GLM | 35340 | Direct aftermarket replacement. |
| Marine Pro | 326468 | Direct aftermarket replacement. |
Engine & Model Compatibility
Confirm your engine model and year in the table below. This part fits a wide array of engines, so verifying your specific model is crucial for a correct fit.
For Johnson Models: Check for your specific model prefix and year code (e.g., J40ELCRM for a 1985 40 HP). If your model is from 1989 onwards, it may be listed as "Multiple models" for that year.
For Evinrude Models: Similarly, check your model prefix and year code (e.g., E40ECRM for a 1985 40 HP). Coverage from 1989 onwards is extensive and may be grouped by year.
| Brand | Model | Rated HP | Stroke | Years |
|---|---|---|---|---|
| Johnson | J40ECRM, J40ELCRM, J40RCRM, J40RLCRM, J40TECRM, J40TELCRM | 40 | 2-Stroke | 1985 |
| Johnson | J40ECOB, J40ELCOB, J40RCOB, J40RLCOB, J40TECOB, J40TELCOB | 40 | 2-Stroke | 1986 |
| Johnson | J40ECDE, J40ELCDE, J40RCDE, J40RLCDE, J40TECDE, J40TELCDE, J40TLCDE | 40 | 2-Stroke | 1987 |
| Johnson | J40ECUD, J40ELCUD, J40RCUD, J40RLCUD, J40TECUD, J40TLCUD | 40 | 2-Stroke | 1988 |
| Johnson | Multiple 40HP models (including J40AELCCS series) | 40 | 2-Stroke | 1989 |
| Johnson | Multiple 40HP models (including J40ECEC series) | 40 | 2-Stroke | 1990 |
| Johnson | Multiple 40HP models (including J40EESR series) | 40 | 2-Stroke | 1991 |
| Johnson | Multiple 40HP models (including J40EEIA series) | 40 | 2-Stroke | 1992 |
| Johnson | Multiple 40HP models (including J40EENJ series) | 40 | 2-Stroke | 1993 |
| Johnson | Multiple 40HP models (including J40EETB series) | 40 | 2-Stroke | 1994 |
| Johnson | Multiple 40HP models (including J40EERE series) | 40 | 2-Stroke | 1995 |
| Johnson | Multiple 40HP models (including J40EEOD series) | 40 | 2-Stroke | 1996 |
| Johnson | Multiple 40HP models (including J40ELEDS series) | 40 | 2-Stroke | 1997 |
| Johnson | Multiple 40HP models (including J40ELEUC series) | 40 | 2-Stroke | 1998 |
| Johnson | Multiple 40HP models (including J40ELECR series) | 40 | 2-Stroke | 1999 |
| Johnson | Multiple 40HP models (including J40WRLEES series) | 40 | 2-Stroke | 2000 |
| Johnson | Multiple 40HP models (including J40WRLSSC series) | 40 | 2-Stroke | 2001 |
| Johnson | Multiple 40HP models (including J40WRLSIR series) | 40 | 2-Stroke | 2002 |
| Johnson | J50ECSR, J50ELCSR | 50 | 2-Stroke | 1980 |
| Johnson | J50BECIC, J50BELCIC | 50 | 2-Stroke | 1981 |
| Johnson | J50BECTA, J50BELCTA, J50TELCTA | 50 | 2-Stroke | 1983 |
| Johnson | J50BECRM, J50BELCRM, J50TELCRM, J50TLCRM | 50 | 2-Stroke | 1984 |
| Johnson | J50BECOB, J50BELCOB, J50TELCOB, J50TLCOB | 50 | 2-Stroke | 1985 |
| Johnson | J50BECDE, J50BELCDE, J50TELCDE, J50TLCDE | 50 | 2-Stroke | 1986 |
| Johnson | J50BECUD, J50BELCUD, J50TELCUD, J50TLCUD | 50 | 2-Stroke | 1987 |
| Johnson | J50BECCS, J50BELCCS, J50TELCCS, J50TLCCS | 50 | 2-Stroke | 1988 |
| Johnson | Multiple 50HP models (including J50BECEC series) | 50 | 2-Stroke | 1989–1990 |
| Johnson | Multiple 50HP models (including J50BEESR series) | 50 | 2-Stroke | 1991 |
| Johnson | Multiple 50HP models (including J50BEEIA series) | 50 | 2-Stroke | 1992 |
| Johnson | Multiple 50HP models (including J50BEENJ series) | 50 | 2-Stroke | 1993 |
| Johnson | Multiple 50HP models (including J50BEETB series) | 50 | 2-Stroke | 1994 |
| Johnson | Multiple 50HP models (including J50BEERE series) | 50 | 2-Stroke | 1995 |
| Johnson | Multiple 50HP models (including J50BEEOD series) | 50 | 2-Stroke | 1996 |
| Johnson | Multiple 50HP models (including BJ50BEEDS series) | 50 | 2-Stroke | 1997 |
| Johnson | Multiple 50HP models (including BJ50RLEUC series) | 50 | 2-Stroke | 1998 |
| Johnson | Multiple 50HP models (including BJ50ESECC series) | 50 | 2-Stroke | 1999 |
| Johnson | Multiple 50HP models (including BJ50EEER series) | 50 | 2-Stroke | 2000 |
| Johnson | Multiple 50HP models (including BJ50ELSSA series) | 50 | 2-Stroke | 2001 |
| Johnson | Multiple 50HP models (including BJ50ELSIF series) | 50 | 2-Stroke | 2002 |
| Johnson | J60ECSR, J60ELCSR | 60 | 2-Stroke | 1980 |
| Johnson | J60ECIA, J60ECIH, J60ELCIA, J60ELCIH, J60TLCIA, J60TLCIH | 60 | 2-Stroke | 1981 |
| Johnson | J60ECTB, J60ELCTB, J60TLCTB | 60 | 2-Stroke | 1983 |
| Johnson | J60ELCRE, J60TLCRE | 60 | 2-Stroke | 1984 |
| Johnson | J60ELCOD, J60TLCOD | 60 | 2-Stroke | 1985 |
| Evinrude | E40ECRM, E40ELCRM, E40RCRM, E40RLCRM, E40TECRM, E40TELCRM | 40 | 2-Stroke | 1985 |
| Evinrude | E40ECOB, E40ELCOB, E40RCOB, E40RLCOB, E40TECOB, E40TELCOB | 40 | 2-Stroke | 1986 |
| Evinrude | E40ECDE, E40ELCDE, E40RCDE, E40RLCDE, E40TECDE, E40TELCDE, E40TLCDE | 40 | 2-Stroke | 1987 |
| Evinrude | E40ECUD, E40ELCUD, E40RCUD, E40RLCUD, E40TECUD, E40TLCUD | 40 | 2-Stroke | 1988 |
| Evinrude | Multiple 40HP models (including E40AELCCS series) | 40 | 2-Stroke | 1989 |
| Evinrude | Multiple 40HP models (including E40ECEC series) | 40 | 2-Stroke | 1990 |
| Evinrude | Multiple 40HP models (including E40EESR series) | 40 | 2-Stroke | 1991 |
| Evinrude | Multiple 40HP models (including E40EEIA series) | 40 | 2-Stroke | 1992 |
| Evinrude | Multiple 40HP models (including E40EENJ series) | 40 | 2-Stroke | 1993 |
| Evinrude | Multiple 40HP models (including E40EETB series) | 40 | 2-Stroke | 1994 |
| Evinrude | Multiple 40HP models (including E40EERE series) | 40 | 2-Stroke | 1995 |
| Evinrude | Multiple 40HP models (including E40EEOD series) | 40 | 2-Stroke | 1996 |
| Evinrude | Multiple 40HP models (including BE40EEDS series) | 40 | 2-Stroke | 1997 |
| Evinrude | Multiple 40HP models (including BE40EEUC series) | 40 | 2-Stroke | 1998 |
| Evinrude | Multiple 40HP models (including BE40EECR series) | 40 | 2-Stroke | 1999 |
| Evinrude | Multiple 40HP models (including E40WRLEES series) | 40 | 2-Stroke | 2000 |
| Evinrude | Multiple 40HP models (including E40WRLSSC series) | 40 | 2-Stroke | 2001 |
| Evinrude | Multiple 40HP models (including E40WRLSIR series) | 40 | 2-Stroke | 2002 |
| Evinrude | E50ECSR, E50ELCSR | 50 | 2-Stroke | 1980 |
| Evinrude | E50BECIC, E50BELCIC | 50 | 2-Stroke | 1981 |
| Evinrude | E50BECTA, E50BELCTA, E50TELCTA | 50 | 2-Stroke | 1983 |
| Evinrude | E50BECRM, E50BELCRM, E50TELCRM, E50TLCRM | 50 | 2-Stroke | 1984 |
| Evinrude | E50BECOB, E50BELCOB, E50TELCOB, E50TLCOB | 50 | 2-Stroke | 1985 |
| Evinrude | E50BECDE, E50BELCDE, E50TELCDE, E50TLCDE | 50 | 2-Stroke | 1986 |
| Evinrude | E50BECUD, E50BELCUD, E50TELCUD, E50TLCUD | 50 | 2-Stroke | 1987 |
| Evinrude | E50BECCS, E50BELCCS, E50TELCCS, E50TLCCS | 50 | 2-Stroke | 1988 |
| Evinrude | Multiple 50HP models (including E50BECEC series) | 50 | 2-Stroke | 1989–1990 |
| Evinrude | Multiple 50HP models (including E50BEESR series) | 50 | 2-Stroke | 1991 |
| Evinrude | Multiple 50HP models (including E50BEEIA series) | 50 | 2-Stroke | 1992 |
| Evinrude | Multiple 50HP models (including E50BEENJ series) | 50 | 2-Stroke | 1993 |
| Evinrude | Multiple 50HP models (including E50BEETB series) | 50 | 2-Stroke | 1994 |
| Evinrude | Multiple 50HP models (including E50BEERE series) | 50 | 2-Stroke | 1995 |
| Evinrude | Multiple 50HP models (including E50BEEOD series) | 50 | 2-Stroke | 1996 |
| Evinrude | Multiple 50HP models (including BE50BEEDS series) | 50 | 2-Stroke | 1997 |
| Evinrude | Multiple 50HP models (including BE50RLEUC series) | 50 | 2-Stroke | 1998 |
| Evinrude | Multiple 50HP models (including BE50ESECC series) | 50 | 2-Stroke | 1999 |
| Evinrude | Multiple 50HP models (including E40WREES series) | 50 | 2-Stroke | 2000 |
| Evinrude | E60ECSR, E60ELCSR | 60 | 2-Stroke | 1980 |
| Evinrude | E60ECIA, E60ECIH, E60ELCIA, E60ELCIH, E60TLCIA, E60TLCIH | 60 | 2-Stroke | 1981 |
| Evinrude | E60ECTB, E60ELCTB, E60TLCTB | 60 | 2-Stroke | 1983 |
| Evinrude | E60ELCRE, E60TLCRE | 60 | 2-Stroke | 1984 |
| Evinrude | E60ELCOD, E60TLCOD | 60 | 2-Stroke | 1985 |
Technical Specs
- Product Type
- Powerhead Base Gasket
- Installation
- Between powerhead and adapter
- Fuel Type
- Compatible with standard marine fuels
- Housing Material
- Gasket material
- Other Technical Attributes
- Designed to provide proper sealing between powerhead and adapter housing
What’s in the Box
- 1 x Powerhead Base Gasket (equivalent to 326468/351018)
Installation Notes
- Safety First: Disconnect the battery and ensure the engine is cool. Relieve any pressure from the fuel system.
- Access the Powerhead: Remove the engine cowling and any components obstructing access to the powerhead mounting bolts.
- Remove the Powerhead: Carefully and evenly loosen and remove the bolts securing the powerhead to the adapter plate. Lift the powerhead off the drive shaft housing.
- Clean Mating Surfaces: Thoroughly remove all traces of the old gasket material from both the bottom of the powerhead and the top of the adapter plate. Use a plastic scraper and an appropriate solvent to avoid scratching the metal surfaces.
- Position New Gasket: Place the new powerhead base gasket onto the adapter plate, ensuring it aligns perfectly with all bolt holes and passages. Do not use sealant unless explicitly required by your engine's service manual.
- Reinstall Powerhead: Lower the powerhead back into position. Hand-tighten the bolts, then torque them to the manufacturer's specified values and sequence using a torque wrench.
- Final Assembly & Testing: Reconnect all components, hoses, and electrical connections. Once assembled, start the engine and carefully check for any water or exhaust leaks around the gasket seam.
Troubleshooting & FAQ
How do I know if my powerhead base gasket is failing?
Signs of a failed powerhead base gasket include water contamination in the cylinders, engine overheating, a noticeable loss of power or compression, or visible water and/or exhaust leaks between the powerhead and the adapter housing.
Does this gasket require sealant during installation?
This gasket is designed to be installed dry. Applying sealant is generally not recommended as it can interfere with proper sealing. However, always refer to your outboard's specific service manual for the definitive procedure.
What is the difference between Johnson/Evinrude part numbers 326468 and 351018?
Part number 351018 is the latest official part number that supersedes older versions like 326468, 321510, and 315852. They are functionally identical, and this aftermarket part is a direct replacement for all of them.
Will this gasket fit my specific engine model if it's not listed?
If your exact engine model or year is not listed in the compatibility table, do not assume fitment. This part is designed for the specific models shown. Purchasing for an unlisted model is at your own risk.
What is the difference between OEM and this aftermarket part?
This listing is for a high-quality aftermarket replacement, not an OEM part. It is engineered to meet or exceed OEM specifications using comparable materials and is manufactured in an ISO 9001 certified facility to ensure consistent quality and performance.
How fast is shipping?
We ship worldwide, with most orders arriving within 5–15 days via standard shipping. Expedited options may be available at checkout depending on your location. Standard shipping is free for most destinations.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order details. Returns of unused items in their original condition are accepted within our standard return window.
Safety & Important Info
- Verify images and specifications against your original part before purchasing. If anything differs—even if your model appears on the compatibility list—do not order.
- This is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.
- Professional installation is strongly recommended for safety, proper function, and to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards: We supply marine parts engineered to stringent OEM-level tolerances and rigorously tested for real-world marine conditions.
- Fast Global Fulfillment: We offer free standard delivery to most regions, with typical transit times of just 5–15 days.
- Manufacturer-Direct Value: By removing middlemen, we deliver fair pricing without ever compromising on materials or quality control.
Payment & Security
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