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MerCruiser 2.5L / 120 Engine Parts

MerCruiser

2.5L / 120 engine parts

2.5L / 120

Find service parts for MerCruiser 2.5L and 120 four-cylinder engines. Confirm the 153-cubic-inch identity and engine serial number before selecting carburetor, ignition, cooling or internal-engine components.

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Service & maintenance

Start your parts search

Collections are browsing aids and include parts for other engines. Confirm the complete model, serial number and exact assembly before ordering.

Engine maintenance collectionBrowse collectionEngine maintenanceBrowse Mercury and MerCruiser service and maintenance parts.Browse collection Cooling system collectionBrowse collectionCooling systemBrowse pumps and cooling components; match the exact assembly.Browse collection Fuel system collectionBrowse collectionFuel systemBrowse fuel-system components; confirm installed equipment.Browse collection

Browse by system

Find your service category

These broader collections help you browse. A category link does not confirm engine-specific compatibility.

MaintenanceBrowse the maintenance collectionBrowse category FiltersBrowse the filters collectionBrowse category FuelBrowse the fuel collectionBrowse category Ignition & electricalBrowse the ignition & electrical collectionBrowse category CoolingBrowse the cooling collectionBrowse category Belts & hosesBrowse the belts & hoses collectionBrowse category Gaskets & sealsBrowse the gaskets & seals collectionBrowse category Drive componentsBrowse the drive components collectionBrowse category

Before selecting parts

Identify the engine you have

Use the complete identification to select the correct generation, diagram and replacement part.

153-cubic-inch identity

The OEM guide identifies 120 and 2.5L as 153-cubic-inch four-cylinder applications. The larger 3.0L/140 is catalogued separately.

Carburetor & serial

Carburetor models and calibration vary within this range. Select the exact assembly and serial-specific notes rather than using one universal production endpoint.

Cooling & propulsion

Identify the installed cooling, ignition, drive and transom equipment. Engine and propulsion assemblies require their respective identification.

3.0L/140, 3.7L/470, Mercury 2.5L outboards and OMC 120 applications require separate parts matching.

Send the complete engine-plate details and clear old-part photos. Match the installed fuel and cooling equipment, and include the separate drive or marine-gear plate when asking about those assemblies.

Mercury official parts catalogue Find your Mercury owner's manual

Documented installations

Boat examples

These examples describe documented engine options or installations. Boats may have been repowered or modified; an example does not establish present-day parts compatibility.

Glastron V-174 Bayflite, 1976 handbook

The factory handbook documents a Mercury 120 option and identifies its four-cylinder, 153-cubic-inch specification.

1987 Glastron CX-19

The factory handbook documents a 120 MerCruiser test package.

Serial number help

Request a parts check

Send the Parts Desk the complete engine model and serial number, the OEM part number if known, and clear photos of the identification plate and old part. Include the installed fuel and cooling equipment when asking about those systems.

Include in your message

  • Complete engine model, suffix and serial number
  • OEM part number, if known
  • Identification-plate and old-part photos
  • Drive, transom or marine-gear identification for those parts

Parts Desk

Help before you order

Send your details through our contact page. The Parts Desk can help check the exact application before you select a replacement.

Ask the Parts Desk