8M0067654 Exhaust Water Shutter for MerCruiser 140 3.0L V8 TDI 4.2L

SERDAMARINE / MARINE EXHAUST PARTS

Exhaust Water Shutter for MerCruiser Stern / Out Drive Applications

This aftermarket exhaust water shutter (flapper valve) is an individual service component corresponding to Mercury Marine reference 8M0067654, rather than a complete exhaust manifold assembly. It is intended for exhaust water shutter replacement on MerCruiser 140, 3.0L, 3.0LX, V8, and TDI 4.2L (335, 370 MCM / MIE) applications.

Engine Applications

Use the exact engine model and exhaust shutter part reference to distinguish similar versions; do not select a shutter solely because it is described for a MerCruiser V8 engine.

• MerCruiser Stern / Out Drive — 140 / 3.0L / 3.0LX Fits when specified — Match the engine configuration and exhaust shutter reference.
• MerCruiser Stern / Out Drive — V8 Fits when specified — Match the exact engine model and exhaust shutter part reference; do not select solely by V8 engine description.
• MerCruiser Stern / Out Drive — TDI 4.2L (335, 370 MCM / MIE) Fits when specified — Match the engine configuration and exhaust shutter reference.

Reference Numbers

The numbers below are provided as identification references for part selection and do not alone confirm interchangeability or manufacturer identity.

Supplied Parts

• Exhaust water shutter

Service & Installation Notes

General service guidance only. Use the service manual for your exact engine and exhaust configuration.

1. Ensure the engine is shut off, completely cool, and secured against accidental starting before opening any exhaust components.
2. Remove the necessary exhaust passage connections to access the existing water shutter and inspect the internal mounting area for leftover debris or wear.
3. Position the replacement exhaust water shutter in the orientation specified by your engine service manual and verify that the flapper moves freely without binding.
4. Reassemble the exhaust connections according to manual procedures; if abnormal exhaust noise or leakage occurs during operation, stop the engine immediately and inspect the assembly.

The Serdamarine Approach

Exhaust parts need a configuration match. Serdamarine focuses on marine exhaust manifolds and their related service parts. Application details, connection requirements and public reference numbers are presented together to support part selection.

Questions Before Replacement