121254-77019 Aftermarket Yanmar 4LH/4LHA Starter Motor | Sawley's Select Marine Parts

🔧 Product Description

The later 2.5kW 15-tooth service starter for Yanmar 4LH and 4LHA marine diesels. It supersedes the complete 121254-77010, 121254-77011 and 121254-77012 starter chain.

⚙️ Key Features

• Marine-rated 12-volt starter construction

• Pinion, rotation and mounting pattern matched to the listed OEM family

• High-torque cranking output for reliable cold and warm starting

• Corrosion-resistant terminals and marine-duty internal components

• Direct replacement when the original OEM starter number matches

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 121254-77019 → Supersedes 121254-77012

• 121254-77012 → Supersedes 121254-77011

• 121254-77011 → Supersedes 121254-77010

OEM / Related Numbers:

• 121254-77019

• 121254-77012

• 121254-77011

• 121254-77010

• 129429-77010

• 129429-77011

• Hitachi S13-41 family

Aftermarket / Verified Equivalents:

• Recmar: REC121254-77019

• PSH / Cargo: 980.512.152.080

• WAI: 19839N

🚤 Compatibility

Commonly used on:

• Yanmar 4LH and 4LHA marine diesel starting systems

Typically suits:

• Engine models:

• Yanmar 4LH-DTE, 4LH-HTE, 4LH-STE and 4LH-TE

• Yanmar 4LHA-DTE and 4LHA-DTZ

• Yanmar 4LHA-HTE, 4LHA-HTZE and 4LHA-HTP

• Yanmar 4LHA-STE and 4LHA-STZE

• HP Range: Engine-rating specific; approximately 140HP-240HP

• Engine Type: Turbocharged inline-four marine diesel

• Year Range: Later service replacement for the 4LH/4LHA family

• Voltage: 12V

• Rated Power: Approximately 2.5kW

• Rotation: Clockwise viewed from the drive end

• Pinion: 15-tooth

🔌 Function

The starter motor converts battery power into mechanical cranking torque. When the solenoid is energised, the pinion engages the flywheel ring gear and rotates the crankshaft until the engine starts and the pinion disengages.

Common signs of failure:

• Starter clicks but does not crank the engine

• Slow or laboured cranking with a fully charged battery

• Pinion spins without engaging the flywheel

• Grinding, clashing or delayed disengagement at the ring gear

• Intermittent operation caused by worn brushes, armature or solenoid contacts

• Excessive heat, burnt odour or high current draw

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging