Shift Housing Gasket – Fits OMC Johnson/Evinrude Outboards (Replaces 324670, 18-0110-9)
Shift Housing Gasket – Fits OMC Johnson/Evinrude Outboards (Replaces 324670, 18-0110-9) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Shift Housing Gasket – Fits OMC Johnson/Evinrude Outboards (Replace...
Product Details
This Shift Housing Gasket creates a secure seal between the shift housing and the lower unit on Johnson/Evinrude (OMC) 75-250 HP outboard engines, including both 2-Stroke and 4-Stroke models. It is a crucial component for preventing gear lube leaks and water intrusion.
This part is a direct replacement for OEM part number 324670 and aftermarket equivalents like Sierra 18-0110-9.
- Installation Location: External, between shift housing and lower unit.
- Engine Range: Fits Johnson/Evinrude 75-250 HP outboards.
- Included: One gasket per package.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC (Johnson/Evinrude) | 324670 |
| Sierra | 18-0110-9 |
| Pro Marine | 18-0110-9 (Reference) |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This gasket is designed for a wide range of Johnson/Evinrude (OMC) outboard engines.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Johnson/Evinrude | Various Models | 75-250 HP | 2-Stroke | 324670 | Original OMC part |
Technical Specs
- Product Type
- Shift Housing Gasket
- Installation
- External
- Connection
- Between shift housing and lower unit
- Housing Material
- Gasket material
- Dimensions
- 6.0" x 7.5" x 1.13"
- Weight
- Approximately 0.8 ounces (22.7 grams)
- Other
- Used on OMC Johnson/Evinrude outboard shift housing assemblies
What’s in the Box
- 1 x Shift Housing Gasket (Replaces 324670/18-0110-9)
Installation Notes
- Ensure the engine is off and the battery is disconnected. Drain the gearcase lubricant.
- Remove the lower unit from the outboard engine assembly.
- Carefully detach the shift housing to access the old gasket.
- Remove the old gasket. Thoroughly clean both mating surfaces to remove any old gasket material or sealant residue.
- Position the new gasket correctly onto the clean surface.
- Re-install the shift housing and the lower unit, tightening all bolts to the manufacturer’s specified torque.
- Refill the gearcase with the correct type and amount of lubricant.
- Before operating in water, check for any leaks around the sealed area.
Troubleshooting & FAQ
How do I confirm this gasket fits my specific engine model?
This gasket fits a broad range of 75-250 HP Johnson/Evinrude outboards. The best method for confirming fitment is to match your old part's number to one of the cross-reference numbers provided: OMC 324670 or Sierra 18-0110-9.
What are common signs of a failed shift housing gasket?
The most common symptoms are gear lube leaking from the seal between the lower unit and the shift housing, or water getting into the gearcase. Water intrusion will often give the gear lube a milky or cloudy appearance.
Should I use sealant with this gasket?
This type of gasket is generally designed to be installed dry. However, it is always best to consult your engine's official service manual for specific instructions and recommendations regarding the use of sealants.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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