865982077 Exhaust Riser Screw for Mercury Mercruiser 357 383 4.3L 5.0L 5.7L 6.2L | JLM Marine

865982077 Exhaust Riser Screw for Mercury Mercruiser 357 383 4.3L 5.0L 5.7L 6.2L

This exhaust riser screw is engineered for Mercury Mercruiser sterndrive and inboard applications, including 357, 383, 4.3L, 5.0L, 5.7L, and 6.2L engines with Alpha and Bravo drive configurations. Designed to secure exhaust risers reliably, this fastener meets the demanding conditions of marine environments.

This screw directly replaces Mercury Mercruiser OEM part numbers 10-865982077 and 865982077, ensuring compatibility across a wide range of performance and standard models.

• Thread specification: .375 - 16 X 10.500
• Suitable for both Alpha and Bravo sterndrive systems as well as inboard configurations
• Precision-manufactured for secure exhaust riser mounting

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 Screw

Installation Guide

1. Ensure the engine is completely cool and ignition is off before beginning work.
2. Remove the old or damaged exhaust riser screw carefully to avoid cross-threading the mounting hole.
3. Inspect the threaded hole in the exhaust manifold or riser flange for debris, corrosion, or damage.
4. Clean the threads thoroughly using a wire brush and apply anti-seize compound to prevent future corrosion.
5. Align the new screw with the mounting hole and hand-thread it several turns to confirm proper engagement.
6. Tighten the screw to the manufacturer's specified torque using a calibrated torque wrench.
7. Double-check alignment and secure fitment of the exhaust riser assembly.
8. Perform a visual inspection after installation and re-torque fasteners after the first engine run if recommended.

Troubleshooting & FAQ

Q: How do I confirm this screw fits my Mercury Mercruiser engine?
A: Cross-reference your engine model with the compatibility table above. If your engine is a 357, 383, 4.3L, 5.0L, 5.7L, or 6.2L with Alpha or Bravo drive, and uses OEM part number 865982077 or 10-865982077, this screw will fit.

Q: What is the correct torque specification for this exhaust riser screw?
A: Refer to your Mercury Mercruiser service manual for the exact torque value for your engine model. Over-tightening can strip threads, while under-tightening may cause exhaust leaks.

Q: Should I use anti-seize compound during installation?
A: Yes, applying marine-grade anti-seize compound to the threads is highly recommended to prevent corrosion and facilitate future removal in saltwater and freshwater environments.

Q: How often should I inspect or replace exhaust riser screws?
A: Inspect exhaust riser fasteners annually or during routine manifold/riser replacement. Replace any screws showing corrosion, thread damage, or that fail to torque properly.

Q: Is this an OEM or aftermarket part?
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.