Powerhead Base Gasket for Johnson/Evinrude 40–60 HP 2-Stroke Outboards – Replaces 326468, 351018
Powerhead Base Gasket for Johnson/Evinrude 40–60 HP 2-Stroke Outboards – Replaces 326468, 351018 is backordered and will ship as soon as it is back in stock.
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Powerhead Base Gasket for Johnson/Evinrude 40–60 HP 2-Stroke Outboa...
Powerhead Base Gasket for Johnson/Evinrude 40–60 HP 2-Stroke Outboards – Replaces 326468, 351018 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Powerhead Base Gasket seals the joint between the powerhead and the adapter plate on selected Johnson and Evinrude 40, 50, and 60 HP 2-stroke outboard engines. A properly fitted gasket helps seal the mating surfaces against water and exhaust leakage during normal engine operation.
The gasket is listed as a replacement for Johnson/Evinrude part numbers 351018 and 326468, along with earlier superseded references 321510 and 315852. Additional aftermarket and manufacturer references associated with this replacement include Sierra 18-0128, GLM 35340, and BRP 778187.
- Installation location: Between the powerhead assembly and the exhaust housing adapter plate.
- Product type: Single powerhead base gasket; this is not a complete gasket set.
- Application: Selected Johnson and Evinrude 40–60 HP 2-stroke outboards listed below.
- Material: Marine engine gasket material intended for the temperature, water, and exhaust environment of an outboard powerhead.
Part Number Matrix
Use the reference numbers below to compare the gasket with your original part and engine parts diagram. Part-number references do not replace confirmation of the exact engine model and year.
| Brand | Part Number | Reference |
|---|---|---|
| Johnson/Evinrude | 351018 | Current replacement reference listed for this gasket; supersedes earlier numbers. |
| Johnson/Evinrude | 326468 | Earlier replacement reference for the same gasket application. |
| Johnson/Evinrude | 321510 | Earlier superseded reference. |
| Johnson/Evinrude | 315852 | Earlier superseded reference. |
| BRP | 778187 | Additional manufacturer reference associated with this replacement. |
| Sierra | 18-0128 | Aftermarket cross-reference. |
| GLM | 35340 | Aftermarket cross-reference. |
Engine and Model Compatibility
The supplied fitment listing covers selected Johnson and Evinrude 2-stroke outboards in the following ranges. The horsepower, model family, year, and stroke must all agree before ordering.
| Brand | Horsepower | Stroke | Listed years | Model examples and coverage |
|---|---|---|---|---|
| Johnson | 40 HP | 2-Stroke | 1985–2002 | 1985–1988 model families include J40ECRM, J40ELCRM, J40RCRM, J40RLCRM, J40TECRM, J40TELCRM, J40ECOB, J40ELCOB, J40ECDE, J40ELCDE, J40ECUD, J40ELCUD and related models. Later years are listed as multiple 40 HP model families, including J40AELCCS, J40ECEC, J40EESR, J40EEIA, J40EENJ, J40EETB, J40EERE, J40EEOD, J40ELEDS, J40ELEUC, J40ELECR, J40WRLEES, J40WRLSSC and J40WRLSIR series. |
| Johnson | 50 HP | 2-Stroke | 1980–2002 | Early listed families include J50ECSR, J50ELCSR, J50BECIC, J50BELCIC, J50BECTA, J50BELCTA, J50TELCTA, J50BECRM, J50BELCRM, J50TELCRM, J50TLCRM, J50BECOB, J50BELCOB, J50TELCOB, J50TLCOB, J50BECDE, J50BELCDE, J50TELCDE, J50TLCDE, J50BECUD, J50BELCUD, J50TELCUD, J50TLCUD, J50BECCS, J50BELCCS, J50TELCCS and J50TLCCS. Later years include multiple 50 HP model families such as J50BECEC, J50BEESR, J50BEEIA, J50BEENJ, J50BEETB, J50BEERE, J50BEEOD, BJ50BEEDS, BJ50RLEUC, BJ50ESECC, BJ50EEER, BJ50ELSSA and BJ50ELSIF series. |
| Johnson | 60 HP | 2-Stroke | 1980–1985 | Listed families include J60ECSR, J60ELCSR, J60ECIA, J60ECIH, J60ELCIA, J60ELCIH, J60TLCIA, J60TLCIH, J60ECTB, J60ELCTB, J60TLCTB, J60ELCRE, J60TLCRE, J60ELCOD and J60TLCOD. |
| Evinrude | 40 HP | 2-Stroke | 1985–2002 | 1985–1988 model families include E40ECRM, E40ELCRM, E40RCRM, E40RLCRM, E40TECRM, E40TELCRM, E40ECOB, E40ELCOB, E40ECDE, E40ELCDE, E40ECUD and E40ELCUD, together with related models. Later years are listed as multiple 40 HP model families, including E40AELCCS, E40ECEC, E40EESR, E40EEIA, E40EENJ, E40EETB, E40EERE, E40EEOD, BE40EEDS, BE40EEUC, BE40EECR, E40WRLEES, E40WRLSSC and E40WRLSIR series. |
| Evinrude | 50 HP | 2-Stroke | 1980–1999 | Listed families include E50ECSR, E50ELCSR, E50BECIC, E50BELCIC, E50BECTA, E50BELCTA, E50TELCTA, E50BECRM, E50BELCRM, E50TELCRM, E50TLCRM, E50BECOB, E50BELCOB, E50TELCOB, E50TLCOB, E50BECDE, E50BELCDE, E50TELCDE, E50TLCDE, E50BECUD, E50BELCUD, E50TELCUD, E50TLCUD, E50BECCS, E50BELCCS, E50TELCCS and E50TLCCS. Later years are listed as multiple 50 HP model families, including E50BECEC, E50BEESR, E50BEEIA, E50BEENJ, E50BEETB, E50BEERE, E50BEEOD, BE50BEEDS, BE50RLEUC and BE50ESECC series. |
| Evinrude | 60 HP | 2-Stroke | 1980–1985 | Listed families include E60ECSR, E60ELCSR, E60ECIA, E60ECIH, E60ELCIA, E60ELCIH, E60TLCIA, E60TLCIH, E60ECTB, E60ELCTB, E60TLCTB, E60ELCRE, E60TLCRE, E60ELCOD and E60TLCOD. |
Examples of model-year codes include Johnson J40ELCRM and Evinrude E40ECRM for 1985 40 HP applications. For later model years, catalogs may group several compatible models under a multiple-model entry. Always compare the complete model designation, year, and original gasket before installation.
Technical Specifications
- Product type
- Powerhead base gasket
- Quantity
- 1 gasket
- Installation position
- Between the powerhead and the adapter plate
- Engine type
- Selected Johnson and Evinrude 2-stroke outboards
- Rated horsepower range
- 40–60 HP, subject to the specific fitment listing
- Replacement references
- 351018, 326468, 321510, 315852, BRP 778187, Sierra 18-0128 and GLM 35340
What's in the Box
- 1 × aftermarket powerhead base gasket
No bolts, sealant, powerhead components, or additional gaskets are included unless specifically stated in the order details.
Installation Notes
- Prepare safely: Disconnect the battery, allow the engine to cool, and follow the safety procedures in the applicable service manual.
- Gain access: Remove the engine cowling and any components that obstruct access to the powerhead mounting hardware.
- Remove the powerhead: Support the powerhead properly, then loosen and remove the mounting hardware according to the manufacturer's procedure. Avoid damaging the driveshaft, wiring, hoses, or adjacent components.
- Clean the mating surfaces: Remove all remnants of the old gasket from the powerhead and adapter-plate surfaces. Use a suitable scraper and solvent without gouging or scratching the metal.
- Position the new gasket: Place the gasket on the correct mating surface and align every bolt hole and passage. Do not apply sealant unless the applicable service manual specifically requires it.
- Reinstall the powerhead: Lower the powerhead into position without shifting the gasket. Hand-start the fasteners, then tighten them in the specified sequence and to the manufacturer's torque values.
- Inspect after assembly: Reconnect all hoses, wiring, and other removed components. After starting the engine in a safe test condition, check for water or exhaust leakage around the gasket joint.
Powerhead removal and installation can require specialized tools and procedures. Professional installation is recommended when the manufacturer's service information or your experience does not cover this repair.
Troubleshooting and FAQ
How can I identify a failing powerhead base gasket?
Possible symptoms include water or exhaust leakage at the powerhead-to-adapter joint, overheating, reduced engine performance, or evidence of water entering areas that should remain sealed. These symptoms can have several causes, so inspect the engine and consult the service manual before replacing parts.
Does this gasket require sealant?
Do not assume that sealant is required. Install the gasket according to the procedure for your exact engine. If the service manual specifies a sealant, use only the specified product and application method.
What is the difference between 326468 and 351018?
The supplied part-number references identify 351018 as the later replacement reference for 326468. Earlier numbers 321510 and 315852 are also listed as superseded references. Confirm the application against your engine model and parts diagram before ordering.
Will this gasket fit an engine that is not listed?
Do not assume fitment for an unlisted model. Match the complete brand, horsepower, stroke, year, model designation, and original gasket shape before purchase.
Is this an OEM gasket?
No. This listing is for an aftermarket replacement gasket. The referenced manufacturer and aftermarket part numbers are provided for identification and cross-reference; the gasket is not represented as an original factory-branded part.
Are the reference numbers printed on the gasket?
Not necessarily. Reference numbers are included to help identify the application and compare parts. Use the physical gasket and the engine parts diagram for final confirmation.
Safety and Important Information
- Verify the exact engine model, year, horsepower, stroke, and gasket configuration before ordering.
- Do not rely on horsepower alone; related engines may use different gaskets.
- Disconnect the battery and follow the manufacturer's safety and service procedures before beginning work.
- Replace the gasket whenever the powerhead is removed if the service manual requires a new gasket.
- This is an aftermarket replacement component and is not an original equipment manufacturer part.
About Sea Sierra
- Marine replacement parts: We provide replacement components for maintenance and repair of marine engines.
- Application-focused listings: Product references and fitment information are supplied to help customers compare the part with their engine and original component.
- Support: When fitment is uncertain, provide the complete engine model designation and year before ordering.
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