Discovery Energy KDI-TCP 3404E5/25A
Built: 2023-2026 · Series: KDI-TCP 3404E5
More machines from model year 2023
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Kohler KDI-TCP 3404 E5 — the SCR Version of the 3.4-Litre Four – turbocharged four-cylinder of 3,359 cc with common-rail injection, for agricultural machinery, construction equipment and generator sets
The KDI-TCP 3404 E5 shares the same turbocharged 3.4-litre four-cylinder block (3,359 cc) as the KDI 3404 TCR, but adds selective catalytic reduction (SCR) for exhaust aftertreatment instead of relying solely on in-cylinder measures. It belongs to the same Kohler/Discovery Energy (Rehlko) common-rail family, listed in the catalogue as "KDI3404TCR-SCR."
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SCR allows finer tuning of fuel consumption against NOx output and is used by Kohler specifically to reach higher power and torque within the same displacement.
Applications mirror the base version: agricultural machinery, construction equipment, and compressors and generator sets; variants on record include KDI-TCP 3404E5/22I, /22N, /22P, /22L and /22M.
While purely in-cylinder NOx reduction through exhaust-gas recirculation and injection timing uses no extra consumables, adding SCR aftertreatment shifts part of the nitrogen-oxide reduction into the exhaust system, allowing combustion to be tuned for fuel economy and output instead; the trade-off is ongoing AdBlue consumption and an extra component in the exhaust path. At the EU Stage V and US Tier 4 Final nonroad emission levels, this combination of in-cylinder measures and SCR is the common route, without necessarily requiring a diesel particulate filter.
Because of the added SCR unit, used examples warrant an additional check of the AdBlue/DEF system (tank, dosing unit, crystallisation) on top of the usual KDI fuel and filter checks; no further type-specific weak points are documented in the sources reviewed.
Sources: SpecCodex register, model data: Kohler KDI-TCP 3404 E5
Technical data
Engine
| Engine family | PKHXL03.4TCPcorrect |
|---|---|
| Engine families | PKHXL03.4TCP; RKHXL03.4TCP; TKHXL03.4TCP; SKHXL03.4TCPcorrect |
| Fuel | 7-15 ppm Ultra Low Sulfur Dieselcorrect |
| Rated output | 75 kWcorrect |
| Power band | 56<=kW<130correct |
| Rated speed | 2,500 rpmcorrect |
| Maximum torque | 490 N·mcorrect |
| Speed at max. torque | 1,400 rpmcorrect |
| Cylinders | 4correct |
| Cylinder layout | in linecorrect |
| Bore | 96 mmcorrect |
| Stroke | 116 mmcorrect |
| Operating cycle | four-stroke dieselcorrect |
| Injection | direct injectioncorrect |
| Aspiration | turbochargedcorrect |
| Turbocharger type | wastegate turbochargercorrect |
| Charge-air cooling | aircorrect |
| Emissions stage | Tier 4 (Final or Phase In)correct |
Origin and approval
| Built from | 2023correct |
|---|---|
| Built to | 2026correct |
| Model year from | 2023correct |
| Model year to | 2026correct |
| Sales region | bothcorrect |
Frequently asked questions
How much power does the Discovery Energy KDI-TCP 3404E5/25A have?
The Discovery Energy KDI-TCP 3404E5/25A delivers 75 kW.
When was the Discovery Energy KDI-TCP 3404E5/25A built?
Production years: 2023-2026.
What to check before buying
- Match the data plate against the order: frame size, mounting and rating have to agree.
- For used units, ask about winding condition and bearing play.
- Ask about parts availability for this series — the running costs hang on it.
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This page carries 25 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
KDI-TCP 3404E5/22I
KDI-TCP 3404E5/22L
KDI-TCP 3404E5/22M
KDI-TCP 3404E5/22N
KDI-TCP 3404E5/22O
KDI-TCP 3404E5/22P
Sources: US EPA — engine certification data (retrieved August 2026) · How we check the data
Diesel engine in 3D section
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