331812 Upper Front Motor Mount for Johnson Evinrude OMC | JLM Marine

Upper Front Motor Mount for Johnson Evinrude OMC 20-35 HP Outboards – OEM 331812

This upper front motor mount is engineered to fit Johnson and Evinrude outboard engines from 20 HP to 35 HP, manufactured between 1979 and 2005. It serves as a direct replacement for OEM part number 331812 and its related superseded numbers, ensuring secure mounting and vibration isolation for your engine's midsection assembly.

Designed as an aftermarket replacement, this mount provides reliable performance for a wide range of OMC two-stroke models. It is compatible with both standard and long-shaft configurations across multiple model years, making it a versatile solution for maintaining your outboard's structural integrity.

• Includes mounting hardware: upper motor mount and two nuts for complete installation
• Direct replacement for OEM 331812, 0331812, 314800, and 0304800
• Fits midsection assemblies on Johnson and Evinrude 20, 25, 28, 30, and 35 HP engines

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here's a guide to help you identify your engine's serial/model: Johnson Serial Number Guide.

Technical Specifications

Package Contents

This package includes the following components for complete installation:

• 1 × Upper Front Motor Mount
• 2 × Mounting Nuts

Installation Guide

1. Disconnect the battery and ensure the engine is in the off position before beginning any work.
2. Support the engine securely using an appropriate hoist or support stand to prevent movement during mount replacement.
3. Remove the engine cowling to access the midsection mounting area.
4. Locate the upper front motor mount on the midsection assembly. Take note of the existing mounting orientation and hardware placement.
5. Remove the old mounting nuts and carefully extract the worn or damaged upper motor mount.
6. Inspect the mounting surfaces for damage, corrosion, or debris; clean thoroughly if necessary.
7. Position the new upper front motor mount in the correct location, aligning it with the mounting holes.
8. Install the two new mounting nuts included in the package, threading them by hand to avoid cross-threading.
9. Tighten the nuts gradually in a crosswise pattern to the manufacturer's recommended torque specification to ensure even compression.
10. Verify that the mount is seated properly and that all hardware is secure.
11. Reinstall the engine cowling and reconnect the battery.
12. Test the engine at idle to confirm proper vibration isolation and secure mounting before operating at higher RPMs.

Troubleshooting & FAQ

How do I confirm this mount fits my specific Johnson or Evinrude engine?
Cross-reference your engine's model number and year with the compatibility table above. You can also verify your engine's serial number using the Johnson Serial Number Guide to ensure proper fitment.

What are the signs that my motor mount needs replacement?
Common symptoms include excessive engine vibration, unusual noises during operation, visible cracks or deterioration in the rubber mount, and misalignment of the engine on the midsection. If you notice any of these signs, inspect and replace the mount promptly.

Can I install this mount myself or do I need a professional?
While this mount can be installed by experienced DIY mechanics with proper tools and engine support equipment, professional installation is recommended to ensure correct torque specifications and safe engine alignment. Improper installation may lead to engine damage or unsafe operation.

How often should motor mounts be replaced?
Motor mounts should be inspected annually as part of routine maintenance. Replacement intervals vary based on operating conditions, but typically mounts should be replaced every 3–5 years or sooner if you notice cracking, hardening, or excessive engine vibration.

Is this an OEM part or an aftermarket replacement?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.