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Caterpillar 10R-8500 is the Caterpillar type electronic unit injector with a white two stud solenoid cap, a cast rocker body with the plunger return spring and blue and red O rings on the barrel. It is used on Caterpillar 3406E, C-15 and C-16 engines. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
The same part is also sold as Caterpillar 211-3023 and Caterpillar 10R-0957.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Electronic Unit Injector |
| Replaces | Caterpillar 211-3023 |
| Injector type | Electronic unit injector (EUI) |
| Engine | Caterpillar 3406E, C-15, C-16 |
| Cross references | Caterpillar 10R-8500, Caterpillar 10R-0957 |
| Fits | the Caterpillar 3406E, C-15 and C-16 diesel engines |
| Condition | New, aftermarket |
| Stat. HS-Code | 840999 |
| Country of Manufacture | China |
Machines
Check the part number on your old unit before ordering.
| Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|
| 211-3023 / Caterpillar 10R-8500 / Caterpillar 10R-0957(SPM-HEP-4886) | the Caterpillar 3406E, C-15 and C-16 diesel engines |
| Brand | Part No. |
|---|---|
| Caterpillar | 211-3023 |
| Caterpillar | 10R-8500 (this page, SPM-HEP-4886) |
| Caterpillar | 10R-0957 |
All of these numbers are the same part.
What it does
It sprays a metered charge of fuel into the cylinder at the right moment. Spray pattern and opening pressure decide how cleanly the engine burns its fuel.
Where it is used
Made for the Caterpillar 3406E, C-15 and C-16 diesel engines. The full list is in the tables above.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay (6 aftermarket sellers) | USD 329.40 to 356.49 | 1 Nov 2026 |
| VEP Diesel | USD 350.00 | 1 Nov 2026 |
| SINOCMP | USD 479.00 | 1 Nov 2026 |
| Spare Part Mart | USD 263.52 | Today |
Our price of USD 263.52 is 20% to 45% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
Yes, it was made for the Caterpillar 3406E, and 2 more listed under compatible equipment. Check the old fuel injector is marked 10R-8500 or one of the cross references, because makers change parts between serial ranges.
On the Caterpillar 3406E, often 5,000 to 10,000 hours, but much less on poor or wet fuel. Injectors are usually changed when they fail a test, not by hours.
Black or white smoke, a misfire or knock on one cylinder, hard starting, higher fuel use, or a high return leak or balance rate on test.
Not always. If the others pass a return leak or balance test, one can be changed. Where they are all high hours, a full set keeps the cylinders even.
Clean the bore and seat of carbon, and keep the nozzle capped until it goes in. Torque the clamp to the engine manual, not by feel.
No. It is an aftermarket fuel injector made to replace the Caterpillar 10R-8500. It is not made by the original manufacturer; the number only shows what it replaces.
Live rates for the quantity selected, delivered to your door. Confirmed at checkout.
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