• Free shipping

  • Free help & advice

  • Hassle-free returns

  • Factory direct prices

Flash Sale now on!

FLASHSALE25
SeaSierra

Gasket – Fits Mercury Mercruiser Water Pump (Replaces Mercury 27-34897, Quicksilver 27-34897)

$2.99 $4.00
Shipping calculated at checkout.

Gasket – Fits Mercury Mercruiser Water Pump (Replaces Mercury 27-34897, Quicksilver 27-34897) is backordered and will ship as soon as it is back in stock.

Worry-free returns

You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This water pump mounting Gasket – Fits Mercury Mercruiser Water Pump is designed for a wide array of MerCruiser GM V6 and V8 engines. It provides a reliable seal between the water pump and the engine block, essential for preventing coolant leaks and ensuring correct engine operating temperature.

This part is a direct cross-reference for Mercury part number 27-34897 and Quicksilver 27-34897.

  • Installation Location: Seals the water pump to the engine block.
  • Function: Prevents coolant leakage at the water pump joint.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand Part Number
Mercury 27-34897
Quicksilver 27-34897

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This gasket is designed for the following Mercury and MerCruiser models. Please verify your specific application before purchase.

Brand Model Years OEM Part No.
MerCruiser 175 (2 BBL.) GM 262 V-6 1987 27-34897
MerCruiser 185 (2 BBL.) GM 262 V-6 1985–1987 27-34897
MerCruiser 185 (4 BBL.) GM 229 V-6 1983–1984 27-34897
MerCruiser 190 GM 283 V-8 1963–1964 27-34897
MerCruiser 198 MIE (2 BBL.) GM 305 V-8 1977 27-34897
MerCruiser 200 (2 BBL.) GM 305 V-8 1985–1987 27-34897
MerCruiser 205 (4 BBL.) GM 262 V-6 1985–1987 27-34897
MerCruiser 225 (2 BBL.) GM 327 V-8 1963–1969 27-34897
MerCruiser 225 MIE GM 327 V-8 1968 27-34897
MerCruiser 228 (4 BBL.) GM 305 V-8 1977–1984 27-34897
MerCruiser 228 MIE (4 BBL.) GM 305 V-8 1977–1980 27-34897
MerCruiser 230 (4 BBL.) GM 305 V-8 1985–1987 27-34897
MerCruiser 230 MIE (4 BBL.) GM 305 V-8 1981–1995 27-34897
MerCruiser 250 (2 BBL.) GM 327 V-8 1968–1969 27-34897
MerCruiser 250 (2 BBL.) GM 350 V-8 1977 27-34897
MerCruiser 250 MIE GM 327 V-8 1968–1969 27-34897
MerCruiser 255 MIE GM 350 V-8 1979–1980 27-34897
MerCruiser 260 (4 BBL.) GM 305 V-8 1982–1987 27-34897
MerCruiser 260 (4 BBL.) GM 350 V-8 1978–1987 27-34897
MerCruiser 260 MIE GM 350 V-8 1981–1987 27-34897
MerCruiser 262 MAG (TBI)(GEN+) ALL 27-34897
MerCruiser 270 (2 BBL.) GM 350 V-8 1969–1972 27-34897
MerCruiser 270 MIE GM 350 V-8 1969–1972 27-34897
MerCruiser 280 TRS GM 350 V-8 1975–1976 27-34897
MerCruiser 300 TEMPEST GM 350 V-8 1985–1986 27-34897
MerCruiser 320 (EFI) GM 350 V-8 1987–1989 27-34897
MerCruiser 350 MAG (SKI) GM 350 V-8 1991–1997 27-34897
MerCruiser 350 MAG. ALPHA (4 BBL.) GM 350 V-8 1996–1997 27-34897
MerCruiser 350 MAG. ALPHA EFI(GEN+) GM 350 V-8 1996–1997 27-34897
MerCruiser 350 MAG. ALPHA GM 350 V-8 1986–1995 27-34897
MerCruiser 350 MAG. BRAVO MPI GM 350 V-8 1995 27-34897
MerCruiser 350 MAG. BRAVO MPI(GEN+) GM 350 V-8 1996–1997 27-34897
MerCruiser 350 MAG. EFI SKI (GEN+) GM 350 V-8 1996 27-34897
MerCruiser 350 MAG. EFI SKI (TBI) GM 350 V-8 1994–1996 27-34897
MerCruiser 350 MAG. MPI MIE (GEN+) GM 350 V-8 1998 27-34897
MerCruiser 4.3L (2 BBL.) GM 262 V-6 1988–1992 27-34897
MerCruiser 4.3L (GEN +) (2 BBL.) GM 262 V-6 1998 27-34897
MerCruiser 4.3L (GEN +) (4BBL) Reman ALL 27-34897
MerCruiser 4.3L (GEN II) (2 BBL.) GM 262 V-6 1992–1996 27-34897
MerCruiser 4.3L CARB ALPHA/BRAVO ALL 27-34897
MerCruiser 4.3L EFI (GEN+) TBI GM 262 V-6 ALL 27-34897
MerCruiser 4.3L MPI ALPHA/BRAVO ALL 27-34897
MerCruiser 4.3LH (GEN +) (4 BBL.) GM 262 V-6 1998 27-34897
MerCruiser 4.3LX (4 BBL.) GM 262 V-6 1988–1995 27-34897
MerCruiser 4.3LX (GEN +) (2 BBL.) GM 262 V-6 1996–1997 27-34897
MerCruiser 4.3LX (GEN II) (4 BBL.) GM 262 V-6 1992–1996 27-34897
MerCruiser 4.3LXH (GEN +) (4 BBL.) GM 262 V-6 1996–1997 27-34897
MerCruiser 5.0L (2 BBL.) GM 305 V-8 1988–2001 27-34897
MerCruiser 5.0L CARB ALPHA/BRAVO ALL 27-34897
MerCruiser 5.0L EFI GM 305 V-8 1998–2001 27-34897
MerCruiser 5.0L MIE (4 BBL.) GM 305 V-8 1987–1995 27-34897
MerCruiser 5.0L MPI ALPHA/BRAVO ALL 27-34897
MerCruiser 5.0LX (4 BBL.) GM 305 V-8 1988–1995 27-34897
MerCruiser 5.7L (2 BBL.) GM 350 V-8 1996–2001 27-34897
MerCruiser 5.7L (SKI) GM 350 V-8 1985–1987 27-34897
MerCruiser 5.7L ALPHA EFI (TBI) GM 350 V-8 1995 27-34897
MerCruiser 5.7L BRAVO EFI (TBI) GM 350 V-8 1995 27-34897
MerCruiser 5.7L CARB ALPHA/BRAVO ALL 27-34897
MerCruiser 5.7L CARB MIE ALL 27-34897
MerCruiser 5.7L CARB SKI ALL 27-34897
MerCruiser 5.7L COMPETITION SKI (GEN+) GM 350 V-8 1998 27-34897
MerCruiser 5.7L COMPETITION SKI GM 350 V-8 1987–1997 27-34897
MerCruiser 5.7L EFI (2 BBL.-TBI) GM 350 V-8 1996–1997 27-34897
MerCruiser 5.7L EFI (GEN+) REPOWER PLUS GM 350 V-8 ALL 27-34897
MerCruiser 5.7L EFI GM 350 V-8 1998–2001 27-34897
MerCruiser 5.7L EFI MIE GM 350 V-8 1997 27-34897
MerCruiser 5.7L GM 350 V-8 1988–1995 27-34897
MerCruiser 5.7L MIE GM 350 V-8 1988–1997 27-34897
MerCruiser 5.7L MPI HORIZON MIE ALL 27-34897
MerCruiser 5.7L MPI MIE ALL 27-34897
MerCruiser 5.7L MPI MIE EC ALL 27-34897
MerCruiser 5.7L MPI SKI ALL 27-34897
MerCruiser 5.7L MPI TOWSPORT WITH GEN III ALL 27-34897
MerCruiser 5.7L SKI EC ALL 27-34897
MerCruiser 5.7LX (4 BBL) GM 350 V-8 1996–1997 27-34897
MerCruiser 5.7LX BRAVO EFI (GEN+) GM 350 V-8 1996–1997 27-34897
MerCruiser 5.7LX EFI (4 BBL.-TBI) GM 350 V-8 1996–1997 27-34897
MerCruiser 6.2L MPI HORIZON MIE ALL 27-34897
MerCruiser 6.2L MPI MIE ALL 27-34897
MerCruiser 6.2L MPI MIE EC ALL 27-34897
MerCruiser 898 (2 BBL.) GM 305 V-8 1977–1984 27-34897
MerCruiser BLACK SCORPION 350 MAG MPI ALL 27-34897
MerCruiser BLACK SCORPION 350 MAG SKI (GEN+) V-8 1996–2001 27-34897
MerCruiser BLACK SCORPION MX 6.2L MPI ALL 27-34897
MerCruiser BLACK SCORPION MX 6.2L SKI (GEN+) V-8 2001–2002 27-34897
MerCruiser MX 6.2L MPI BRAVO ALL 27-34897
MerCruiser MX 6.2L MPI HORIZON BRAVO ALL 27-34897
MerCruiser MX 6.2L MPI HORIZON MIE ALL 27-34897
MerCruiser MX 6.2L MPI MIE ALL 27-34897
MerCruiser MX 6.2L MPI SKI ALL 27-34897
MerCruiser SCORPION 350 ALL 27-34897
MerCruiser SCORPION 350 EC ALL 27-34897
MerCruiser SCORPION 377 ALL 27-34897
MerCruiser SCORPION 377 HO EC ALL 27-34897
MerCruiser Scorpion 377 Sterndrive ALL 27-34897
MerCruiser 350 (4 BBL) Gen+ Crate Engine ALL 27-34897
MerCruiser 350 (4BBL) Crate Alpha ALL 27-34897
MerCruiser 350 (4BBL) Crate Bravo ALL 27-34897
MerCruiser 350 (4BBL) Crate Inboard ALL 27-34897
MerCruiser 350 Alpha (4 BBL) Crate Engine ALL 27-34897
MerCruiser 350 MPI ALPHA ALL 27-34897
MerCruiser 350 MPI Crate ALL 27-34897
MerCruiser 350 MAG MPI ALPHA/BRAVO ALL 27-34897
MerCruiser 350 MAG MPI ALPHA/BRAVO EC ALL 27-34897
MerCruiser 350 MAG MPI HORIZON ALPHA/BRAVO ALL 27-34897
MerCruiser 350 MAG MPI HORIZON ALPHA/BRAVO EC ALL 27-34897
MerCruiser 350 MAG MPI HORIZON MIE ALL 27-34897
MerCruiser 350 MAG MPI MIE ALL 27-34897
MerCruiser 350 MAG MPI SKI ALL 27-34897
MerCruiser 357 Alpha 4V ALL 27-34897
MerCruiser 357 HRZ 630A BOBTAIL RM ALL 27-34897
MerCruiser 357 HRZ 630V BOBTAIL RM ALL 27-34897
MerCruiser 357 Mag Bravo 4V ALL 27-34897
MerCruiser 357 STROKER SCORPION ALL 27-34897
MerCruiser 377 MAG MPI BRAVO ALL 27-34897
MerCruiser 377 MAG MPI BRAVO EC ALL 27-34897
MerCruiser 383 Mag Bravo 4V ALL 27-34897
MerCruiser 383 Mag Inboard 4V ALL 27-34897
MerCruiser 383 MAG STROKER ALL 27-34897
MerCruiser 383 MAG STROKER BRAVO ALL 27-34897
MerCruiser 383 MAG STROKER INBOARD ALL 27-34897
MerCruiser 383 STROKER SCORPION ALL 27-34897
MerCruiser 383 STROKER SCORPION BRAVO ALL 27-34897
MerCruiser 385 Performance Tuned ALL 27-34897
MerCruiser Scorpion 377 ALL 27-34897
MerCruiser Exhaust / Cooling Systems and Extension Kits 1985 and Below 27-34897

Technical Specs

Product Type
Gasket
Installation
Water Pump Mounting
Dimensions
Height: 4.0 in; Width: 5.13 in; Length: 1.06 in
Weight
0.141 kg (0.31 lbs)
Shape
Round

What’s in the Box

  • 1 x Gasket (Replaces 27-34897)

Installation Notes

  1. Ensure the engine is cool and disconnect the battery.
  2. Drain the engine coolant to a level below the water pump assembly.
  3. Loosen and remove the serpentine belt or V-belts from the water pump pulley.
  4. Unbolt and carefully remove the water pump from the engine block, noting bolt lengths and positions.
  5. Thoroughly clean all old gasket material and sealant residue from both the engine block and water pump mating surfaces.
  6. Position the new gasket onto the mounting surface of the water pump.
  7. Mount the water pump and gasket assembly onto the engine block, hand-tightening the bolts.
  8. Torque the bolts to the manufacturer’s specified values and sequence.
  9. Reinstall belts, hoses, and refill the cooling system with the appropriate coolant.
  10. Reconnect the battery, start the engine, and inspect carefully for any signs of leaks.

Troubleshooting & FAQ

What are the signs of a failing water pump gasket?

The most common signs are coolant leakage visible around the water pump housing, engine overheating, puddles of coolant under the engine, and a low coolant level warning. You may also see rust or staining originating from the pump area.

Is this gasket reusable?

No. This is a single-use gasket. It is designed to compress and create a seal. Once it has been installed and torqued, it should be discarded and replaced if the pump is ever removed again for any reason.

Do I need to apply sealant to this gasket during installation?

This gasket is typically designed to be installed dry. However, always refer to your specific engine's service manual for the final word, as some older applications or pitted surfaces may require a thin, even coat of a suitable gasket sealant.

Is this an aftermarket or OEM part?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

What are the shipping speed and cost?

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

What is the warranty and return policy?

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

  • Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
  • This is an aftermarket replacement, not an OEM component.
  • Professional installation is recommended for safety and performance.

About Sea Sierra

  • Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
  • Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
  • Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

Payment & Security

Payment methods

    Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

    Customer Reviews

    Be the first to write a review
    0%
    (0)
    0%
    (0)
    0%
    (0)
    0%
    (0)
    0%
    (0)

    • Visit our support center

      Expert help & advice

    • Check your order status

      Updates & tracking

    • Returns & exchanges

      All you need to know

    • Price-match guarantee

      Our promise to you