Throttle Control Isolator with Clamp – Fits Mercury Verado 200-400 HP Outboards (Replaces 815504256, 8M0113513)

Throttle Control Isolator with Clamp – Fits Mercury Verado 200-400 HP Outboards

This throttle control isolator with clamp provides a secure, direct-fit replacement for Mercury Verado 6-cylinder 4-stroke outboards from 200 to 400 HP (2004–present). It is also referred to as an "Air Intake Isolator Boot" or "ETC Intake Boot."

Engineered to resolve issues like rough idling or poor sealing, this component ensures proper air intake management for the electronic throttle control system. It directly replaces Mercury parts 815504256, 8M0113513, 87928815T, 880576005, and 880576T04.

• Direct Fit Installation: Designed for straightforward replacement of the original part without modifications.
• Durable Construction: Made from high-grade CR (Chloroprene) rubber with a stainless steel worm gear clamp for longevity and a secure seal.
• Complete Kit: Includes both the isolator boot and the necessary clamp for a full repair.

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 Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Isolator-ETC (Replaces 8M0113513)
• 1 x CLAMP Worm Gear (Replaces 815504256)

Installation Guide

1. Safety First: Ensure the engine is turned off, in neutral, and has had time to cool down completely. Disconnect the negative battery terminal.
2. Locate the Isolator: Identify the existing throttle control isolator boot, which connects the air intake to the electronic throttle control (ETC) module.
3. Remove the Old Clamp: Using an appropriate screwdriver or socket, loosen and remove the old clamp securing the isolator.
4. Remove the Old Isolator: Carefully twist and pull the old isolator boot off both connection points. Note its orientation.
5. Clean Surfaces: Wipe down the mounting surfaces on the throttle body and intake to ensure they are free of dirt, oil, or old rubber residue.
6. Install New Isolator: Slide the new isolator boot into place, making sure it is fully seated and properly aligned.
7. Secure New Clamp: Position the new worm gear clamp over the isolator and tighten it firmly. Do not overtighten, as this could damage the boot.
8. Final Checks: Reconnect the negative battery terminal. Start the engine and listen for any hissing sounds that might indicate an air leak.

Troubleshooting & FAQ

Q: How do I know if this throttle control isolator fits my Mercury Verado?

A: This isolator is designed for all Mercury Verado 6-cylinder engines from 200 to 400 HP, manufactured from 2004 to the present. You can verify fitment by matching your engine model and year in the "Compatible Engine Models" table or by cross-referencing your existing part number with the numbers listed (e.g., 815504256, 8M0113513).

Q: What are the signs of a failing throttle isolator boot?

A: Common symptoms of a cracked or leaking boot include a rough or unstable idle, engine stalling, hesitation during acceleration, or specific engine fault codes related to the air-fuel mixture or intake system. A visual inspection may reveal cracks, brittleness, or a loose fit.

Q: Is installation difficult? Can I do it myself?

A: Installation is straightforward for those with basic mechanical skills and can typically be completed with common hand tools. It involves removing the old boot and clamp and securing the new ones. However, if you are unsure, we recommend professional installation to prevent air leaks and ensure correct fitment.

Q: OEM vs. Aftermarket?

A: 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.

Q: How fast do you ship and how much does it cost?

A: 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.

Q: What is your warranty and return policy?

A: 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.