4 Pcs Fuel Injector 6646906 for Isuzu Engine 4JB1 Bobcat Loader 843 853 1213
This fuel injector is engineered as a direct replacement for the Isuzu Engine 4JB1 Bobcat Loader 843 853 1213. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.
Vehicle Compatibility
| Application | Details |
|---|---|
| Isuzu Engine 4JB1 | See product specifications |
| Isuzu Engine:4JB1 Application:Fit for following models | See product specifications |
| Bobcat Skid Steer Loader:843, 853, 1213Mustang Skid Steer Loader:960, 2060 | See product specifications |
Replaces OEM Part Numbers
6646906 • 1112100BB • Isuzu • Engine • Application • following • models • Bobcat • Steer • Loader • 1213Mustang
Signs You Need a Replacement
If your equipment is showing any of these symptoms, the injectors & nozzle may be the cause:
- Rough idle or misfire — Uneven fuel delivery from a worn injector causes the engine to shake at idle. On Bobcat engines, this is often accompanied by a knocking sound under load.
- Black or white exhaust smoke — Black smoke means excess fuel; white smoke indicates incomplete combustion. Both point to injector spray pattern degradation.
- Loss of engine power — A single failing injector reduces cylinder output. Multi-cylinder engines lose noticeable power when one injector flows less than the rest.
- Increased fuel consumption — Poor atomization means the engine burns more fuel to produce the same power. Monitor your fuel burn rate as an early warning sign.
- Hard starting or no start — If the injector doesn’t deliver fuel on cranking, the cylinder won’t fire. This is especially common in cold weather with worn nozzles.
- Fuel in engine oil (dilution) — Fuel leaking past the injector seat seal contaminates the crankcase oil. If the oil level rises or smells of diesel, inspect the injectors immediately.
Replace as a Set
Replace all injectors as a set whenever possible. On Bobcat engines, mixing old and new injectors creates uneven fuel delivery — the new injectors compensate for the worn ones, shortening their life. When installing, use new copper sealing washers and torque to the specification in the service manual. After installation, run the engine at idle for 5 minutes to bleed air from the fuel system, then check for leaks at each injector connection before putting the machine under load.
Frequently Asked Questions
Will this fit my Bobcat 843?
Yes. This part is designed to fit the Bobcat 843, 853, 1213 among other models listed in the compatibility table above. Verify your specific model and engine code before ordering to ensure the correct fit.
Can I cross-reference 6646906 with 1112100BB?
Yes. Both 6646906 and 1112100BB are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.
This listing is for 4 pieces – do I need to buy a full set?
This listing includes 4 units. For best results, replace all injectors at the same time rather than one at a time. Mixing old and new units causes uneven fuel delivery and shortens the life of the new parts.
What are the common failure signs on a Bobcat engine?
On Bobcat engines, watch for black exhaust smoke under load, rough idle, misfire codes (P0300 series), and loss of power. A single failing injector can reduce engine output by up to 25%. If you notice fuel in the engine oil, the injector seat seal is likely compromised.
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