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Exhaust Flapper with Grommets – Fits MerCruiser Stern Drives 2.5L, 3.0L, 3.7L (Replaces 60930, 18-2727)
- $20.99
$25.00- $20.99
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Exhaust Flapper with Grommets – Fits MerCruiser Stern Drives 2.5L, 3.0L, 3.7L (Replaces 60930, 18-2727)
This exhaust flapper is designed for MerCruiser Stern Drive applications, including 4-Cylinder 2.5L, 3.0L, and 3.7L engines manufactured between 1982 and 1998, as well as V8 engines equipped with a Jackshaft from 1985 onwards.
It serves as a direct replacement for several OEM and aftermarket part numbers, ensuring compatibility and a proper fit for your engine's exhaust system.
- Installation Type: Direct Replacement
- Fuel Compatibility: Gasoline
- Included Components: Includes one exhaust flapper and two grommets for a complete installation.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury MerCruiser | 60930 / 25-43809 |
| Sierra | 18-2727 |
| Mallory | 9-42800 |
Compatible Engine Models
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 4-Cylinder | 2.5L | 4-Stroke | 1982-1998 | 60930 | |
| MerCruiser | 4-Cylinder | 3.0L | 4-Stroke | 1982-1998 | 60930 | |
| MerCruiser | 4-Cylinder | 3.7L | 4-Stroke | 1982-1998 | 60930 | |
| MerCruiser | V8 with Jackshaft | Various | 4-Stroke | 1985-Up | 60930 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Exhaust Flapper Shutter |
| Installation | Direct Replacement |
| Fuel Type | Gasoline |
| Housing Material | Premium Metal and Rubber |
| Dimensions | 79 mm × 94 mm (3.1" × 3.7") [width × length] |
| Other Technical Attributes | High hardness, durable construction |
Package Contents
- 1 x Exhaust Flapper (60930)
- 2 x Grommets
Installation Guide
- Safety First: Ensure the engine is completely cool and the battery is disconnected before starting.
- Locate Flapper: Identify the exhaust flapper's location, typically within the Y-pipe or exhaust outlet housing.
- Remove Old Components: Carefully remove the old, worn-out exhaust flapper and its grommets. This may require prying.
- Clean Housing: Thoroughly clean the inside of the housing, removing any carbon buildup, rust, or old rubber fragments.
- Install New Grommets: Press the two new grommets firmly into their designated holes in the housing.
- Insert New Flapper: Align the pins on the new exhaust flapper with the holes in the grommets and slide it into place.
- Verify Movement: Check that the flapper can swing open and closed smoothly without sticking or binding.
- Final Check: Reconnect the battery, start the engine, and listen for any unusual noises or check for exhaust leaks.
Troubleshooting & FAQ
Q: How do I confirm this exhaust flapper fits my engine?
A: This part fits MerCruiser 4-Cylinder (2.5L, 3.0L, 3.7L) engines from 1982-1998 and V8 models with a jackshaft (1985-Up). To be certain, please verify your OEM part number is 60930, 18-2727, or 9-42800 and check the compatible models table.
Q: What are the symptoms of a bad exhaust flapper?
A: Common signs of a failing flapper include a distinct rattling or clattering noise from the exhaust at idle speeds, water backing up into engine cylinders, or visible cracks and deterioration on the flapper itself upon inspection.
Q: How often should I inspect or replace the exhaust flapper?
A: It is recommended to inspect your exhaust flappers annually during routine maintenance. We suggest replacement every 3-5 years, or immediately if you notice any signs of damage, to prevent catastrophic engine failure from water ingestion.
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.
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