SKU: 50919849936

Water Shutter Kit – Fits MerCruiser V6/V8 Stern Drives (Replaces 807166A3)

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Description

Water Shutter Kit – Fits MerCruiser V6/V8 Stern Drives (Replaces 807166A3)Water Shutter Kit Fits MerCruiser V6 V8 Stern Drives (Replaces 807166A3) This aftermarket water shutter and bellows kit is engineered for MerCruiser stern drive engines equipped with 4 inch exhaust systems, covering most V6 and V8 models from approximately 1982 through 1996. It serves as a direct replacement to prevent water from backing up into the engine through the exhaust. This kit directly replaces Mercury MerCruiser part numbers 807166A3 and

Water Shutter Kit – Fits MerCruiser V6/V8 Stern Drives (Replaces 807166A3)

This aftermarket water shutter and bellows kit is engineered for MerCruiser stern drive engines equipped with 4-inch exhaust systems, covering most V6 and V8 models from approximately 1982 through 1996. It serves as a direct replacement to prevent water from backing up into the engine through the exhaust.

This kit directly replaces Mercury/MerCruiser part numbers 807166A3 and 807166A1; Sierra 18-2732-9; GLM 89170; and Mallory 9-42802.

  • Function: The two-piece "clapper" design prevents water ingestion into the engine.
  • Installation Location: Mounts inside the exhaust Y-pipe.
  • Complete Kit: Includes shutters, upper and lower bellows, and all necessary clamps for a full replacement.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
Mercury/MerCruiser 807166A3
Mercury/MerCruiser 807166A1
Sierra 18-2732-9
GLM 89170
Mallory 9-42802

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.

MerCruiser Sterndrive Models

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser 4.3L (2 BBL.) GM 262 V-6 Various 4-Stroke 1988-1992 807166A3
MerCruiser 4.3LX (4 BBL.) GM 262 V-6 Various 4-Stroke 1988-1992 807166A3
MerCruiser 4.3L (GEN II) (2 BBL.) GM 262 V-6 Various 4-Stroke 1992-1995 807166A3
MerCruiser 4.3LX (GEN II) (4 BBL.) GM 262 V-6 Various 4-Stroke 1992-1995 807166A3
MerCruiser 5.0L (2 BBL.) GM 305 V-8 Various 4-Stroke 1988-1995 807166A3
MerCruiser 5.0LX (4 BBL.) GM 305 V-8 Various 4-Stroke 1988-1995 807166A3
MerCruiser 5.7L GM 350 V-8 Various 4-Stroke 1988-1995 807166A3
MerCruiser 5.7L ALPHA EFI (TBI) GM 350 V-8 Various 4-Stroke 1995 807166A3
MerCruiser 5.7L BRAVO EFI (TBI) GM 350 V-8 Various 4-Stroke 1995 807166A3
MerCruiser 7.4L BRAVO GM 454 V-8 Various 4-Stroke 1988-1991 807166A3
MerCruiser 7.4L BRAVO (GEN. V) GM 454 V-8 Various 4-Stroke 1992-1994 807166A3
MerCruiser 454 MAG. BRAVO (GEN. V) GM 454 V-8 Various 4-Stroke 1992-1994 807166A3
MerCruiser 454 MAG. BRAVO MPI GM 350 V-8 Various 4-Stroke 1995 807166A3

MerCruiser Inboard Models

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser D3.0L VM 183 I/L5 Various 4-Stroke 1994-1995 807166A3 Diesel
MerCruiser D3.6L VM 219 I/L6 Various 4-Stroke 1994-1995 807166A3 Diesel
MerCruiser D4.2L/220 IDI VM 254 I/L6 Various 4-Stroke 1994-1995 807166A3 Diesel
MerCruiser D183 TURBO AC VM 183 I/L5 Various 4-Stroke 1990-1993 807166A3 Diesel
MerCruiser D219 TURBO AC VM 219 I/L6 Various 4-Stroke 1990-1993 807166A3 Diesel
MerCruiser D254 TURBO AC VM 254 I/L6 Various 4-Stroke 1990-1993 807166A3 Diesel
MerCruiser 530 D-TA VM 183 I/L5 Various 4-Stroke 1989 807166A3 Diesel
MerCruiser 636 D-TA VM 219 I/L6 Various 4-Stroke 1989 807166A3 Diesel

Technical Specifications

Specification Value
Product Type Exhaust Water Shutter Kit
Installation Exhaust Y-Pipe
Fuel Type Gasoline
Connection 4-inch Exhaust System
Housing Material Rubber/Neoprene
Housing Color Black
Dimensions Approx. 4 inches diameter (101.6 mm)
Operating Temperature Up to 105°C (221°F)
Warranty 1 Year (Aftermarket)
Other Technical Attributes 2-piece "clapper" design; prevents water backflow

Package Contents

  • 2 x Water Shutters/Flappers (Replaces 807166A3)
  • 2 x Lower Exhaust Bellows (Replaces 32-14358T / 32-14358001)
  • 2 x Upper Exhaust Bellows (Replaces 32-44348T / 32-44348001)
  • 4 x Stainless Steel Clamps

Installation Guide

  1. Safety First: Begin by disconnecting the boat's battery to prevent any accidental starts.
  2. Access the Stern Drive: Depending on your boat's configuration, gain access to the stern drive's exhaust components.
  3. Remove Old Bellows: Loosen the clamps and carefully remove the old upper and lower exhaust bellows.
  4. Remove Old Shutters: Extract the old, worn water shutters from the exhaust Y-pipe. Take note of their orientation.
  5. Clean Surfaces: Thoroughly clean the Y-pipe and exhaust tube surfaces where the new bellows will be seated.
  6. Critical Fitment Check: This kit will not work on V6 engines with one-piece manifolds or early V8 models with a round pin going through the flapper. Verify your system before proceeding.
  7. Install New Shutters: Insert the new water shutters into the Y-pipe, ensuring they are correctly oriented and can move freely.
  8. Install New Bellows: Fit the new upper and lower bellows into position and secure them tightly with the new stainless steel clamps.
  9. Final Check: Re-connect the battery. Start the engine and check for any exhaust leaks around the new bellows.

Troubleshooting & FAQ

Q: How do I know if this kit fits my MerCruiser engine?

A: This kit is designed for MerCruiser V6 and V8 stern drives from 1982-1996 with a 4-inch exhaust system. Please check the compatibility tables on this page to confirm your specific model and year. It is crucial to note this will not fit V6 engines with one-piece exhaust manifolds or early V8 models that use a round pin through the flapper.

Q: What is the purpose of the "water shutter" or "flapper"?

A: The water shutter is a critical component in your exhaust system that prevents water from flowing back into the engine cylinders when the engine is off or at idle. A functioning shutter protects your engine from catastrophic water damage.

Q: What are signs that my old water shutters have failed?

A: Common signs of failure include rattling noises from the exhaust at idle, engine overheating, or difficulty starting. Upon visual inspection, you might find the old shutters are broken, brittle, missing pieces, or have fallen into the exhaust pipe.

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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 50919849936

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