124250-77012 Aftermarket Yanmar Starter Motor | Sawley's Select Marine Parts

🔧 Product Description

A 15-tooth Hitachi-pattern starter for Yanmar 3HM, 3JH and 4JH marine diesel families. It supersedes 124250-77010 and 124250-77011 and cross-references to several later 3JH/4JH starter numbers.

⚙️ 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:

• 124250-77012 → Supersedes 124250-77011

• 124250-77011 → Supersedes 124250-77010

OEM / Related Numbers:

• 124250-77012

• 124250-77011

• 124250-77010

• 129573-77010

• 171008-77010

• Hitachi S12-47

• Hitachi S12-77

• Hitachi S12-77A

• Hitachi S114-257

Aftermarket / Verified Equivalents:

• Marine Spare Parts: PH150-0004

• Recmar: REC124250-77012

• WAI: 18205N

• AS-PL: S2157S

🚤 Compatibility

Commonly used on:

• Yanmar HM, JH and selected QM marine diesel starting systems

Typically suits:

• Engine models:

• Yanmar 3HM, 3HM35 and 3HMF

• Yanmar 3JH2 and related early 3JH models

• Yanmar 4JH and 4JHE

• Yanmar 4JH-TE, 4JH-DTE and 4JH-HTE

• Yanmar 4JH2 and 4JH3 families where 124250-77012 is specified

• Selected Yanmar 2QM and 3QM30 applications using the same 15-tooth starter family

• HP Range: Engine-rating specific; approximately 27HP-100HP

• Engine Type: Naturally aspirated or turbocharged three- or four-cylinder marine diesel

• Year Range: Model-dependent HM/JH/QM production

• Voltage: 12V

• Rated Power: Approximately 1.8-2.0kW depending on replacement manufacturer

• 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