Exhaust Water Shutter Flapper Valve for MerCruiser 140, 3.0L, 3.0LX and 4.2L V8 Engines – OEM References 8M0067654, 60930
Exhaust Water Shutter Flapper Valve for MerCruiser 140, 3.0L, 3.0LX and 4.2L V8 Engines – OEM References 8M0067654, 60930 is backordered and will ship as soon as it is back in stock.
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Exhaust Water Shutter Flapper Valve for MerCruiser 140, 3.0L, 3.0LX...
Exhaust Water Shutter Flapper Valve for MerCruiser 140, 3.0L, 3.0LX and 4.2L V8 Engines – OEM References 8M0067654, 60930 is backordered and will ship as soon as it is back in stock.
Product Details
This Exhaust Water Shutter Flapper Valve is a replacement manifold exhaust shutter for selected MerCruiser stern-drive and inboard applications. It is listed for MerCruiser 140, 3.0L, 3.0LX, and V8 TDI 4.2L applications rated at 335 or 370 MCM/MIE. The shutter helps allow exhaust gases to exit while reducing the risk of water traveling back through the exhaust system toward the engine.
The company catalog identifies Mercury Marine OEM reference numbers 8M0067654 and 60930. Additional aftermarket reference numbers listed for comparison are Sierra Marine 18-2727, Mallory Marine 9-42800, and GLM 89165. Reference numbers and engine details should be checked against the original part and the engine identification before ordering.
- Replacement exhaust water shutter/flapper valve.
- For the MerCruiser applications listed below.
- Sold as one shutter valve; grommets and other installation hardware are not specified as included in the company package information.
- Aftermarket replacement part; not a Mercury Marine OEM-manufactured component.
Part Number Matrix
Use these manufacturer and aftermarket reference numbers to compare the replacement with the part being removed. A number match alone does not replace verification of the complete engine and drive application.
| Brand or Reference Type | Part Number |
|---|---|
| Mercury Marine OEM reference | 8M0067654 |
| Mercury Marine OEM reference | 60930 |
| Sierra Marine aftermarket reference | 18-2727 |
| Mallory Marine aftermarket reference | 9-42800 |
| GLM aftermarket reference | 89165 |
Engine and Model Compatibility
The company fitment record lists the following MerCruiser applications. Keep the model, horsepower, engine configuration, and MCM/MIE designation together when checking fitment.
| Brand | Engine or Model | Rated HP | Configuration | Drive or Application |
|---|---|---|---|---|
| MerCruiser | 140 | 140 | Not specified | MCM/MIE application listed by the company |
| MerCruiser | 3.0L | Not specified | Not specified | Stern/out-drive application |
| MerCruiser | 3.0LX | Not specified | Not specified | Stern/out-drive application |
| MerCruiser | V8 TDI 4.2L | 335 or 370 | V8 TDI | MCM/MIE application |
Year ranges, serial-number ranges, shaft dimensions, and stroke information are not specified in the company fitment record. Do not extend the fitment to other engine models solely because the shutter looks similar.
Technical Specifications
- Product Type
- Manifold exhaust water shutter flapper valve
- Brand or Application
- MerCruiser stern/out-drive and listed MCM/MIE applications
- OEM Reference Numbers
- 8M0067654 and 60930
- Aftermarket Reference Numbers
- Sierra Marine 18-2727; Mallory Marine 9-42800; GLM 89165
- Installation
- Replacement installation; confirm the original shutter orientation before removal
- Included Hardware
- Not specified in the company package information
What's in the Box
- 1 x Exhaust water shutter flapper valve
Grommets, clamps, hoses, and other installation hardware are not listed as included. Reuse only hardware that is in serviceable condition and appropriate for the application.
Installation Notes
- Make sure the engine is switched off and completely cool. Follow the boat manufacturer's safety procedures and disconnect the battery when appropriate.
- Locate the exhaust manifold or exhaust outlet area where the existing water shutter is installed. Remove surrounding hoses or components only as necessary for access.
- Before removing the old shutter, note its position and opening direction.
- Remove the old shutter and inspect the surrounding exhaust passage, mounting surfaces, and any retaining hardware for damage or excessive corrosion.
- Clean the seating area and compare the replacement with the removed part and the applicable OEM reference number.
- Install the replacement shutter in the same orientation as the original, allowing exhaust flow while positioning the shutter to help limit water backflow.
- Reassemble all removed exhaust components according to the manufacturer's service procedure. Check for leaks and abnormal noise during the initial run test.
Because installation access and retaining arrangements vary by engine and drive configuration, consult the applicable MerCruiser service information or use a qualified marine technician when necessary.
Troubleshooting and FAQ
What does an exhaust water shutter do?
The shutter is positioned in the exhaust system to permit exhaust gases to pass while helping reduce water backflow toward the engine. A damaged or missing shutter can increase the risk of water entering areas where it may cause engine damage.
What are common signs that the shutter needs inspection?
Possible signs include rattling from the exhaust area, a damaged or deteriorated shutter found during inspection, abnormal exhaust noise, or evidence of water intrusion. Diagnose the complete exhaust system before replacing parts.
Does this product include grommets?
No grommets are specified in the company package information for this product. The package is one exhaust water shutter flapper valve. Verify the condition and availability of any separate retaining or sealing hardware before beginning installation.
Will this fit a MerCruiser 2.5L or 3.7L engine?
Those applications are not listed in the company fitment record for this product. The listed applications are MerCruiser 140, 3.0L, 3.0LX, and V8 TDI 4.2L engines rated at 335 or 370 MCM/MIE. Confirm your engine model and original part number before ordering.
Is this an OEM Mercury Marine part?
No. This is an aftermarket replacement. The Mercury Marine numbers 8M0067654 and 60930 are shown as OEM reference numbers for comparison.
How often should the exhaust shutter be inspected?
Inspection intervals depend on engine use, storage, exhaust temperature, and water conditions. Inspect it whenever the related exhaust components are serviced and replace it if it is cracked, hardened, distorted, loose, or otherwise damaged.
What are the shipping and return terms?
Shipping speed, shipping cost, warranty coverage, and return eligibility are determined by the store's current policies and checkout information.
Safety and Important Information
- Verify the engine model, horsepower, configuration, drive or MCM/MIE designation, and original part number before purchase.
- Do not rely on a similar appearance or a single cross-reference number to confirm fitment.
- Allow the engine and exhaust system to cool fully before inspection or installation.
- Follow the applicable MerCruiser service procedure. Professional marine installation is recommended when access, exhaust removal, or water-ingestion diagnosis is involved.
- This is an aftermarket replacement, not a Mercury Marine OEM component.
About Sea Sierra
- Marine Replacement Parts — We provide replacement components for marine service and repair applications.
- Application-Focused Listings — Product references and listed fitment are provided to help customers compare parts before ordering.
- Support for Parts Identification — When fitment is uncertain, compare the original component and complete engine identification before installation.
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