• 27991734 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part
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27991734 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

27991734 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

$50.40 AUD
$50.40 AUD
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✓ Authorised Volvo Penta Dealer · Marine & auto specialists · Ships Australia-wide

🔧 Product Description

Genuine Quicksilver Driveshaft Housing Gasket - Part Number: 27-991734

A genuine Quicksilver driveshaft housing gasket used on selected Mercury and Mariner V6 2-stroke, EFI, DFI / OptiMax, Jet and high-performance outboard midsection assemblies. This gasket seals the driveshaft housing to the driveshaft housing plate / exhaust plate area.

⚙️ Key Features

  • Genuine Quicksilver OEM driveshaft housing gasket
  • Correct Mercury part number 27-991734
  • Used in V6 outboard midsection / driveshaft housing assemblies
  • Commonly listed with 27-991764 cylinder block gasket in powerhead and lower-unit gasket set components
  • Important replacement during powerhead, driveshaft housing or exhaust plate service

🚤 Compatibility

Commonly used on

  • Mercury / Mariner V6 driveshaft housing and exhaust plate gasket applications

Typically suits

  • Engine models:
  • Mercury V-135 DFI 2.5L - serial 0T801000 to 1B226999
  • Mercury V-135 DFI 2.5L - serial 1B227000 to 1B417701
  • Mercury V-135 DFI 2.5L - serial 1B417702 and up
  • Mercury V-150 DFI 2.5L - serial 0T801000 to 1B226999
  • Mercury V-150 DFI 2.5L - serial 1B227000 to 1B417701
  • Mercury V-150 DFI 2.5L - serial 1B417702 and up
  • Mercury V-175 DFI 2.5L - serial 0T801000 to 1B226999
  • Mercury V-175 DFI 2.5L - serial 1B227000 to 1B417701
  • Mercury V-175 DFI 2.5L - serial 1B417702 and up
  • Mercury V-150 EFI 2.5L - serial 0T801000 to 1B226999
  • Mercury V-150 EFI 2.5L - serial 1B227000 and up
  • Mercury V-200 EFI 2.5L - serial 0T801000 to 1B226999
  • Mercury V-200 EFI 2.5L - serial 1B227000 and up
  • Mercury XR-6 / Magnum III engine gasket set applications - serial 0G960500 to 1B226999
  • Mercury 150 Pro XS 2.5L - serial 1B690542 to 2B535572
  • Mercury 175 Pro XS 2.5L - serial 1B516339 to 2B535624
  • Mercury 200XS DFI 2.5L - serial 0T818181 to 1E000796
  • Mercury 200XS DFI 2.5L - serial 1E000797 to 1E002110
  • Mercury 200XS ROS DFI 2.5L - serial 1E050852 and up
  • Mercury 200XS SST - serial 1E050629 and up
  • Mercury 105 Jet / 140 Jet 2.5L V6 driveshaft housing applications where 27-991734 is specified
  • Mercury 105HP to 225HP V6 drive housing plate applications where 27-991734 is specified
  • HP Range: commonly 105 Jet through 225HP V6 applications where specified
  • Engine Type: Mercury / Mariner V6 2-stroke, EFI, DFI / OptiMax and Racing outboard
  • System Type: Driveshaft housing to driveshaft housing plate gasket

🔌 Function

The gasket seals the driveshaft housing interface, helping prevent exhaust leakage, water leakage and contamination at the midsection / exhaust plate area.

⚠️ Common Signs of Failure

  • Exhaust leakage from midsection
  • Water leakage around driveshaft housing joint
  • Gasket damaged during powerhead or midsection removal
  • Corrosion or residue around gasket surface
  • Replacement required during exhaust plate or driveshaft housing service

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 27-991734 current OEM service reference
  • 27-991733 / 27-991732 / 27-991731 related earlier gasket-family references where applicable

OEM / Related Numbers

  • 27-991734
  • 991734
  • 27991734
  • 27-99173-4
  • 27-991733
  • 27-991732
  • 27-991731
  • 27-183076 related driveshaft housing plate gasket
  • 26-38970 related seal
  • 27-991764 related cylinder block gasket

Aftermarket / Verified Equivalents

  • WSM: 510-30 related drive housing gasket reference

📦 Condition

  • Genuine Quicksilver part
  • Brand new
  • Supplied in original or equivalent packaging

Shipping & Delivery

Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.

Returns & Warranty

14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.

Not sure this fits?

Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.

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