Sisu K-25SI/4000
Built: 1957 · Series: Other models
More machines from model year 1957
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
Sisu – other trucks: the collective page of Finnish trucks outside the named ranges, from the K and KB types to the L-131 and L-139, 47 to 408 kW, Sisu's own and bought-in diesel engines of 3.0 to 15.2 litres
This page gathers Sisu trucks the register could not assign to a named range – mostly older cab-over K and KB types and the L-131 and L-139 ranges of the 1970s, some models also carrying nicknames such as Kärppä-Sisu (ermine) or Karhu-Sisu (bear). Sisu, the Finnish truck maker with plants including Karjaa and, historically, Karhula, has built sturdy trucks suited to Finland's climate and infrastructure since the 1930s; the K in the type designation, by the maker's logic, stands for the cab-over cab (Finnish 'kaappiohjaamo'), the following number for the power or tonnage class, SVT, CVT and CIT for different cab and drivetrain variants.
Read on 3 more paragraphs
The register lists here 174 versions with 47 to 408 kW from four- to eight-cylinders of 2,980 to 15,200 cm³, unladen weights from 2,300 to 18,500 kg, lengths from 5,000 to 11,930 mm and widths from 1,850 to 3,200 mm.
Sisu is Finland's most important truck maker and, besides civilian road transport, traditionally also supplies the Finnish military and forestry with off-road, winter-hardy vehicles; the marque has thereby held its own for decades alongside the big Scandinavian makers Volvo and Scania.
On the older K and KB types, corrosion on the frame and cab, the condition of the engine, clutch and gearbox, and the availability of spare parts, largely confined to Finland for these rarely exported models, count; on all-wheel-drive forestry and off-road versions, the transfer case, axles and tyres as well.
Sources: SpecCodex register, model data: Sisu (weitere Modelle)
Technical data
Engine
| Power | 81 kWcorrect |
|---|---|
| Displacement | 5,240 cm³correct |
Dimensions and weights
| Length | 6,600 mmcorrect |
|---|---|
| Width | 2,360 mmcorrect |
| Unladen weight | 4,000 kgcorrect |
Where this model stands
Power-to-weight ratio: 20.2 kW/t (81 kW / 4 t)
Stronger than 3% of the trucks in the register — out of 25,242 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Sisu K-25SI/4000 have?
The Sisu K-25SI/4000 delivers 81 kW.
How much does the Sisu K-25SI/4000 weigh?
The unladen weight is 4,000 kg.
What engine does the Sisu K-25SI/4000 have?
5,240 cm³ displacement.
What are the dimensions of the Sisu K-25SI/4000?
6,600 mm × 2,360 mm.
When was the Sisu K-25SI/4000 built?
Production years: 1957.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
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This page carries 6 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.
The technical data on this page comes from official vehicle registration records (RDW/Traficom), not from the manufacturer.
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Other models in this series
A-45CI
BT-69CR/5900
JYRY R142-BPT-6X2
K-141BPT/4200
K-38/4000
KARHU- SISU
KB-124SD/2500
KB121 BG/2500
L-137SVT-4X4/4300-KE
L131-SVT
LP-138SV/4800
LP138CIT/4000
Sources: Traficom — Finnish vehicle register (retrieved August 2026) · How we check the data
Truck in 3D section
Turn the model, look inside and click an assembly — each one is explained.
