Exhaust Elbow Gasket – Fits MerCruiser 3.7L 165-190HP (Replaces 27-18272, 27-97863)

Exhaust Elbow Gasket – Fits MerCruiser 3.7L 165-190HP (Replaces 27-18272, 27-97863)

This exhaust elbow gasket is designed for MerCruiser 4-cylinder 165HP, 170HP, 180HP, 190HP, and 3.7LX engines with aluminum exhaust manifolds (1985–1989). It ensures a reliable, leak-free seal between the exhaust elbow and the manifold.

This part is a direct replacement for Mercury/MerCruiser part numbers 27-18272 and 27-97863, as well as aftermarket parts from Sierra (18-0881-1), GLM (32470), Osco (8561-G), and Mallory (9-61412).

• Engineered for a direct fit and easy installation.
• Constructed from OEM-spec materials compatible with aluminum manifolds.
• Includes one high-quality exhaust elbow gasket.

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.

Technical Specifications

Package Contents

• 1 x Exhaust Elbow Gasket (27-18272/27-97863)

Installation Guide

1. Ensure the engine is completely cool and disconnect the battery terminals for safety.
2. Drain the engine coolant to a level below the exhaust manifold.
3. Carefully unbolt and remove the exhaust elbow from the manifold.
4. Remove the old gasket and discard it. Thoroughly clean both mating surfaces, ensuring they are free of any old gasket material or corrosion.
5. Position the new gasket onto the manifold, aligning it with the bolt holes.
6. Reinstall the exhaust elbow and tighten the bolts to the manufacturer's recommended torque specification.
7. Refill the cooling system and reconnect the battery.
8. Start the engine and carefully inspect for any water or exhaust leaks around the gasket area.

Troubleshooting & FAQ

How do I know if this gasket fits my MerCruiser engine?
This gasket is specifically designed for MerCruiser 4-cylinder 165HP, 170HP, 180HP, 190HP, and 3.7LX models from 1985–1989 that use aluminum exhaust manifolds. To confirm fitment, please check your engine's model and serial number against the ranges listed in the "Compatible Engine Models" table.

What are the signs that my exhaust elbow gasket is failing?
Common symptoms of a failed gasket include visible water leakage from the joint between the exhaust elbow and manifold, engine overheating, or water intrusion into the engine cylinders, which can lead to poor performance and significant engine damage.

Is this gasket compatible with cast iron manifolds?
No, this part is engineered specifically for the original aluminum exhaust manifolds on the designated MerCruiser models. Using it with a cast iron manifold may result in an improper seal and leaks.

OEM vs. Aftermarket?
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.