This starter motor is a direct-fit replacement for the Isuzu C-190 and C-240 industrial and Elf engines built between 1982 and 1995, made to the same mounting, output and mechanical specification as the original equipment unit so it bolts straight into place. A starter motor's job is to crank the engine over via the flywheel ring gear until it fires under its own power; when the internal windings, brushes or solenoid wear out, cranking becomes weak, intermittent or stops altogether, which is when a replacement unit like this one is needed.
It is a 24-volt, 3.5kW offset gear reduction (OSGR) unit turning clockwise on a 9-tooth drive pinion, matching the original Hitachi S25-121A specification. Fitting is a straightforward like-for-like swap: disconnect the battery, remove the mounting bolts securing the original starter, transfer the wiring across, and bolt this unit into place in the same orientation.
Key Features
- Direct OEM fit and function for Isuzu C-190 and C-240 engines
- 24-volt, 3.5kW gear reduction motor for strong diesel cranking
- Clockwise (CW) rotation, 9-tooth drive gear
- Cross-references Isuzu 5811001291 and Hitachi S25-121A
- Complete, ready-to-fit unit
- 12-month warranty as standard
Technical Specs
| Specification |
Detail |
| Voltage |
24V |
| Output |
3.5kW |
| Rotation |
CW |
| Drive Teeth |
9 |
| Starter Type |
OSGR (offset gear reduction) |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model |
Years |
| Isuzu Industrial Equipment - C-190 / C190 Engine |
1982-1995 |
| Isuzu Industrial Equipment - C-240 / C240 Engine |
1982-1995 |
| Isuzu Elf Engine (C-190 / C240) |
1982-1995 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 5811001290, 5811001291, 5811001292 |
Isuzu |
| S25-121, S25-121A |
Hitachi |
| SHI0099 |
Arrowhead |
| 111247 |
Cargo |
| 18285 |
Lester |
| STR-6105 |
NSA |
| 2-2264-HI |
WAI |
| 410-44012 |
J&N Electrical |
Frequently Asked Questions
Will this starter fit my engine without modification?
Yes, provided your engine is an Isuzu C-190 or C-240 running a 24-volt system. Cross-check the number stamped on your original starter against the reference list above.
What's included?
The starter motor unit only, complete with its drive gear ready to fit.
Is this a 12V or 24V unit?
This is a 24-volt starter. Fitting it to a 12-volt system will result in very slow cranking, so confirm your machine's system voltage first.
How can I tell my old starter has failed?
Common signs include a clicking noise when you turn the key, the engine failing to crank, the starter freewheeling without turning the engine, or a burning smell from the motor.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
