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Caterpillar 127-8209 is the mechanically actuated electronic unit injector (MEUI): the plunger with its large return spring, the rocker bracket and the nozzle body with O-ring grooves. It is used on Caterpillar 3114 and 3116 engines. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Fuel Injector |
| Replaces | Caterpillar 127-8209 |
| Type | Unit injector (MEUI) |
| Engine | Caterpillar 3114, 3116 |
| Machine | Caterpillar 320B excavators and other 3114/3116 powered machines |
| Fits | Caterpillar 3114 and 3116 engines, as used in Caterpillar 320B excavators and other machines |
| Condition | New, aftermarket |
| Stat. HS-Code | 840999 |
| Country of Manufacture | China |
Caterpillar machines
Check the part number on your old unit before ordering.
| Caterpillar Part No.(SPM Part No.) | Fits |
|---|---|
| 127-8209(SPM-HEP-5247) | Caterpillar 3114 and 3116 engines, as used in Caterpillar 320B excavators and other machines |
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 3114, 3116 engines and as used in Caterpillar 320B excavators and other machines. 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 |
|---|---|---|
| Amazon (drivfsty) | USD 107.88 | 3 Nov 2026 |
| eBay, aftermarket seller | USD 120.00 | 3 Nov 2026 |
| WDPART | USD 140.05 | 3 Nov 2026 |
| Amazon (LYJE-Spare parts) | USD 143.00 | 3 Nov 2026 |
| Amazon (HQELECT-Parts) | USD 153.00 | 3 Nov 2026 |
| Spare Part Mart | USD 82.85 | Today |
Our price of USD 82.85 is 23% to 46% 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 3114, and 2 more listed under compatible equipment. Check the old fuel injector is marked 127-8209 or one of the cross references, because makers change parts between serial ranges.
On the Caterpillar 3114, 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.
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.
Run a return leak test or read the injector balance rates with a diagnostic tool. On older mechanical engines, cracking each pipe in turn at idle shows which cylinder changes least.
No. It is an aftermarket fuel injector made to replace the Caterpillar 127-8209. 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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