4 x Exhaust Elbow Gasket – Fits Mercury MerCruiser 4.3L, 5.0L, 5.7L, 6.2L, 7.4L, 8.2L Sterndrives (Replaces 27-863726, 27-860232)

Exhaust Elbow Gasket – Fits Mercury MerCruiser 4.3L, 5.0L, 5.7L, 6.2L, 7.4L, 8.2L Sterndrives

This exhaust elbow gasket is designed for Mercury MerCruiser V6 and V8 engines (4.3L, 5.0L, 5.7L, 6.2L, 7.4L, & 8.2L) from approximately 1998–2001 that are equipped with center rise outlet exhaust manifolds.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit for standard cooling applications. This gasket is used to seal the connection between the exhaust manifold and the riser/elbow.

• Gasket Type: Full Flow (Open) design for standard raw water cooling systems.
• Engine Fitment: Compatible with a wide range of GM-based MerCruiser V6 & V8 engines.
• Package Contents: Includes four gaskets to service multiple engines or have spares.

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

• 4 x Exhaust Elbow Gasket (Replaces 27-863726 / 27-860232)

Installation Guide

1. Ensure the engine is completely cool and disconnect the battery.
2. Drain the cooling system, specifically the exhaust manifold, if necessary.
3. Carefully disconnect any hoses attached to the exhaust riser or elbow.
4. Unbolt and remove the riser/elbow from the exhaust manifold.
5. Thoroughly clean both mating surfaces of the manifold and the riser, removing all old gasket material and corrosion.
6. Position the new gasket onto the manifold, making sure it aligns with the bolt holes and passages.
7. Reinstall the riser/elbow and tighten the bolts in a crossing pattern to the manufacturer's recommended torque specifications.
8. Reconnect all hoses and clamps securely.
9. Refill the cooling system with the appropriate coolant.
10. Reconnect the battery.
11. Start the engine and carefully inspect for any water or exhaust leaks around the gasket area.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: This gasket fits a wide range of MerCruiser V6 and V8 engines from 1998–2001 with center-rise exhaust manifolds and 4" riser connections. It is a full-flow (open) type for standard cooling systems. The best way to confirm is to match your engine model and year to our compatibility chart and cross-reference your old part number with the numbers listed.

Q: What is the difference between a full-flow and a restricted gasket?
A: This full-flow (open) gasket allows maximum water flow and is used in standard/raw-water cooling systems. A restricted gasket has smaller passages to limit water flow, which is required for many closed/freshwater cooling systems. Using the wrong type can lead to engine overheating or overcooling.

Q: What are the signs my exhaust elbow gasket is failing?
A: Common signs of a failed gasket include visible water leaks (especially when the engine is running), rust stains originating from the joint between the manifold and riser, engine overheating alarms, or steam coming from the engine compartment.

Q: How often should I replace this gasket?
A: It is best practice to replace the exhaust manifold and riser gaskets whenever you separate the components for inspection or service. In saltwater environments, it is recommended to inspect the exhaust system annually and plan to replace gaskets and risers every 3-5 years as part of preventative maintenance.

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.