27879855001 Mercury MerCruiser Gasket | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Cylinder Block / Crankcase Gasket - Part Number: 27-879855001

Genuine Quicksilver gasket used on Mercury 1.5L 3-cylinder DFI / OptiMax powerhead assemblies. This gasket is used with 75HP, 80 Jet, 90HP, 115HP, 115 Pro XS and 125HP DFI engines where the cylinder block or crankcase diagram specifies 27-879855001.

⚙️ Key Features

• Genuine Quicksilver OEM gasket

• Correct Mercury part number 27-879855001

• Used on Mercury 1.5L DFI / OptiMax block assemblies

• Commonly serviced with M10 block studs and crankcase hardware

• Direct replacement gasket for supported 75HP to 125HP DFI powerheads

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 27-879855001 current OEM gasket reference

OEM / Related Numbers:

• 27-879855001

• 879855001

• 27879855001

• Cylinder block gasket

• Crankcase gasket

• 16-892561001 related M10 x 136 block stud

• 11-40140 related M10 nut

• 12-8M0214963 related washer

• 39-8M0071643 related ring seal

Aftermarket / Verified Equivalents:

• OEM gasket match recommended for 27-879855001

• Complete aftermarket gasket sets for Mercury 1.5L DFI may include this gasket where listed by OEM number

• Do not substitute by shape alone; porting and sealing bead layout must match the 1.5L DFI block diagram

🚤 Compatibility

Commonly used on:

• Mercury 1.5L 3-cylinder DFI / OptiMax cylinder block assemblies

• Mercury 75HP to 125HP DFI crankcase service

• Powerhead service where gasket 27-879855001 is specified

Typically suits:

• Engine models:

• Mercury 75 DFI 1.5L 3-cylinder - serial 0T980000 to 1B226999

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B227000 to 1B417701

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B417702 to 1B736884

• Mercury 75 DFI 1.5L 3-cylinder - serial 1B736885 and up

• Mercury 80 Jet DFI 1.5L - serial 1B586067 to 1B736884

• Mercury 80 Jet DFI 1.5L - serial 1B736885 and up

• Mercury 90 DFI 1.5L - serial 0T801000 to 1B226999

• Mercury 90 DFI 1.5L - serial 1B227000 to 1B417701

• Mercury 90 DFI 1.5L - serial 1B417702 to 1B736884

• Mercury 90 DFI 1.5L - serial 1B736885 and up

• Mercury 115 DFI 1.5L - serial 0T801000 to 1B226999

• Mercury 115 DFI 1.5L - serial 1B227000 to 1B417701

• Mercury 115 DFI 1.5L - serial 1B417702 to 1B736884

• Mercury 115 DFI 1.5L - serial 1B736885 and up

• Mercury 115 Pro XS 1.5L - serial 1B751825 and up

• Mercury 125 DFI 1.5L - serial 1B736885 and up

• HP Range: 75HP - 125HP where specified

• Engine Type: Mercury 1.5L 3-cylinder DFI / OptiMax outboard

• System Type: Cylinder block / crankcase gasket

🔌 Function

The gasket seals the specified block or crankcase joint to maintain internal sealing and prevent leakage between the mating surfaces.

Common signs of failure:

• Gasket disturbed during powerhead teardown

• Oil or residue around crankcase joint

• Poor sealing after block service

• Gasket crushed, torn or hardened

• Engine rebuild requiring new crankcase gasket

• Replacement required when related block studs are removed

📦 Condition

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging