Lower Unit Seal Kit for Johnson/Evinrude 85–140 HP V4 2-Stroke Outboards, 1973–1983 – Replaces Sierra 18-2692
Lower Unit Seal Kit for Johnson/Evinrude 85–140 HP V4 2-Stroke Outboards, 1973–1983 – Replaces Sierra 18-2692 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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Lower Unit Seal Kit for Johnson/Evinrude 85–140 HP V4 2-Stroke Outb...
Lower Unit Seal Kit for Johnson/Evinrude 85–140 HP V4 2-Stroke Outboards, 1973–1983 – Replaces Sierra 18-2692 is backordered and will ship as soon as it is back in stock.
Product Details
This comprehensive Lower Unit Seal Kit is designed for Johnson/Evinrude 85–140 HP V4 two-stroke outboard engines manufactured between 1973 and 1983. It provides the listed seals, gaskets, O-rings, and washers for servicing and resealing the lower unit gearcase, helping address water intrusion and gearcase oil leaks when the gearcase is otherwise mechanically sound.
This aftermarket kit is listed as a replacement for Sierra 18-2692, GLM 86712, Mallory 9-74113, and Soxa-Marine 18-2692. These are replacement or cross-reference numbers and should be compared with the original part and the engine model information before ordering.
- Installation: Suitable for DIY mechanics and professional technicians with the appropriate service information and tools.
- Seal Service Kit: Includes the gaskets, O-rings, oil seals, and washers listed in the package contents.
- Marine Application: Components are intended for lower-unit gearcase sealing service in the listed outboard applications.
Part Number Matrix
Use this matrix to compare replacement and aftermarket reference numbers. Verify the number, engine model, and application before purchase.
| Brand | Reference Part Number |
|---|---|
| Sierra | 18-2692 |
| GLM | 86712 |
| Mallory | 9-74113 |
| Soxa-Marine | 18-2692 |
Engine & Model Compatibility
Confirm the engine brand, model family, horsepower, stroke, and year before ordering. The following applications are listed for this seal kit.
| Brand | Model | Rated HP | Stroke | Years | Reference Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | V4 | 85 | 2-Stroke | 1973–1980 | 18-2692 | Verify the exact engine model before ordering. |
| Johnson/Evinrude | V4 | 90 | 2-Stroke | 1981–1983 | 18-2692 | Verify the exact engine model before ordering. |
| Johnson/Evinrude | V4 | 100 | 2-Stroke | 1979–1980 | 18-2692 | Verify the exact engine model before ordering. |
| Johnson/Evinrude | V4 | 115 | 2-Stroke | 1973–1983 | 18-2692 | Verify the exact engine model before ordering. |
| Johnson/Evinrude | V4 | 135 | 2-Stroke | 1973–1976 | 18-2692 | Verify the exact engine model before ordering. |
| Johnson/Evinrude | V4 | 140 | 2-Stroke | 1977–1983 | 18-2692 | Verify the exact engine model before ordering. |
Technical Specs
- Product Type
- Lower Unit Gearcase Seal Kit
- Application
- Johnson/Evinrude V4 outboard gearcases listed above
- Stroke
- 2-Stroke
- Installation
- DIY or professional installation
- Components
- Gaskets, O-rings, oil seals, and washers
- Material
- Various rubber and synthetic sealing materials
- Warranty
- 1 year against manufacturing defects under normal use
- Package Dimensions
- 180 mm × 150 mm × 18 mm (7.05 in × 5.95 in × 0.7 in)
- Weight
- 0.12 kg (0.26 lb)
What’s in the Box
- 1 × Shift Housing Gasket (324670)
- 2 × Oil Seal (321453)
- 1 × Solenoid Cover Gasket (314876)
- 2 × Washer (311598)
- 4 × O-Ring (317178)
- 1 × O-Ring (322598)
- 1 × O-Ring (313446)
- 1 × O-Ring (314728)
- 1 × O-Ring (318372)
- 2 × Oil Seal (330137)
Installation Notes
- Safely secure the outboard engine and disconnect the battery. Drain the gearcase oil completely into a suitable container.
- Remove the propeller assembly, taking care to note the order of the thrust washer, spacer, and nut.
- Unbolt and carefully lower the gearcase assembly from the engine’s midsection.
- Disassemble the gearcase, including the water pump and bearing carrier, laying out all parts in order on a clean surface.
- Carefully remove the old gaskets, seals, and O-rings. Thoroughly clean all mating surfaces so they are free of old adhesive, corrosion, and debris.
- Install the new seals and O-rings from the kit. Use an installation method and lubricant compatible with the seal material to help prevent damage.
- Reassemble the gearcase components according to the manufacturer’s service manual, including the correct sequence and torque specifications.
- Refill the gearcase with the recommended type and amount of fresh marine gear lubricant before reinstalling the propeller.
Lower-unit disassembly and seal replacement can require specialized tools and service procedures. Use the applicable service manual or have the work performed by a qualified marine technician.
Troubleshooting & FAQ
How do I know if this seal kit will fit my engine?
This kit is listed for Johnson/Evinrude 85–140 HP V4 two-stroke outboards from 1973–1983, with the horsepower-specific year ranges shown in the compatibility chart. Verify the exact engine model, horsepower, stroke, and year against the chart and compare the original seals or reference number before ordering.
What are common signs of a failing lower-unit seal?
Common indicators include milky or creamy-looking gear oil, which can indicate water intrusion, or visible oil leakage around the propeller shaft or drain screws. Grinding noise or poor shifting performance may indicate additional gearcase problems and should be diagnosed before resealing.
How often should I replace my gearcase seals?
There is no fixed replacement interval for every engine. Inspect the gearcase for leaks at regular service intervals and replace seals when they leak, show damage, become hard or brittle, or whenever the applicable service procedure requires their removal.
Does this kit include everything for a complete lower-unit rebuild?
No. This is a sealing kit containing the listed gaskets, O-rings, oil seals, and washers. It does not include bearings, gears, shafts, or other internal hard parts. It is intended for resealing a mechanically sound gearcase.
Is this an OEM part?
This listing is for an aftermarket replacement seal kit, not an OEM component. The listed Sierra, GLM, Mallory, and Soxa-Marine numbers are replacement or cross-reference numbers used to help compare applications.
What are the shipping options?
Typical transit is 5–15 days for standard worldwide shipping where available. Expedited options and final delivery estimates are shown at checkout when available.
What are the warranty and return terms?
The kit is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the applicable standard return window when the item is unused and in its original condition. Contact support with your order details for assistance.
Safety & Important Info
- Verify the engine model, horsepower, stroke, year, reference number, and original-part details before ordering.
- This is an aftermarket replacement seal kit, not an OEM component.
- Professional installation is recommended when lower-unit disassembly, special tools, or manufacturer-specific procedures are required.
- Do not operate the outboard if the gearcase has unresolved oil leakage, water intrusion, grinding, or shifting problems.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered for dependable service in real-world marine conditions.
- Fast Global Fulfillment — Free standard delivery is available to most regions, with typical transit of 5–15 days.
- Manufacturer-Direct Value — Fair pricing with attention to materials and quality control.
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