3C8650183 Tohatsu Marine Gasket | Genuine OEM Outboard Part

🔧 Product Description

Genuine Tohatsu / Nissan Water Pump Case Gasket - Part Number: 3C8-65018-3

A genuine Tohatsu/Nissan water-pump case gasket for the three-cylinder 40 HP and 50 HP pump assembly. The compact service number 3C8650183 corresponds to OEM part 3C8-65018-3 and supersedes earlier gasket revisions.

⚙️ Key Features

• Genuine Tohatsu/Nissan formed pump-case gasket

• Seals the pump liner/housing assembly to the lower-unit surface

• Correct coolant-port and bolt-hole alignment

• Single-use gasket recommended whenever the pump assembly is removed

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 3C8-65018-3 / 3C8650183M → current gasket reference

• 3C8-65018-2 → preceding revision

• 3C8-65018-1 / 3C8650181M → earlier gasket superseded to 3C8650183M

OEM / Related Numbers:

• 3C8650183

• 3C8650183M

• 3C8-65018-3

• 3C8-65018-2

• 3C8-65018-1

• 3C8650181M

Aftermarket / Verified Equivalents:

• Aftermarket 3C8-65018-3 pump-case gasket

• Mercury cross-reference family: 27-16158-3 on applicable Tohatsu-built engines

🚤 Compatibility

Commonly used on:

• Tohatsu M40D and M40D2

• Tohatsu M50D and M50D2

• Nissan NS40D2 and NS50D2

• Selected MD40/MD50 or Tohatsu-built Mercury/Mariner pump assemblies only where 3C8-65018-3 is specified

Typically suits:

• HP Range: 40-50 HP

• Engine / System Type: Three-cylinder two-stroke/TLDI lower-unit water pump, application dependent

• Year Range: Approximately 2002 onward, pump revision dependent

• Serial / Identification Range: Confirm the pump housing and gasket profile. Earlier and later 3C8/3T5 pump housings can require different matched liners and gaskets.

🔌 Function

Seals the water-pump case to prevent cooling-water pressure loss around the pump base.

Common signs replacement or service is required:

• Water leakage around the pump case

• Weak pump output after reassembly

• Gasket is torn, compressed or stuck to the housing

• Corrosion or scoring is present on the gasket surface

📦 Condition

• Genuine Tohatsu / Nissan OEM gasket, brand new.

• Brand new

• Supplied in manufacturer or equivalent protective packaging