Sisu SM300 CKH
Built: 1985 · Series: SM300
More machines from model year 1985
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The Sisu SM300 CKH is a truck of the Sisu SM300 series, built in 1985. The engine delivers 298 kW from a displacement of 14,000 cm³. Dimensions: 11,500 mm in length and 2,795 mm in width. Kerb weight is 11,150 kg.
The SM300 is a forward-control truck from the S series that Sisu built in the 1980s. Cummins engines first appeared in Sisu trucks in 1966 to 1968 but caused warranty problems; the partnership was re-established in 1978, and the six-cylinder units soon earned a good reputation. At 14,000 cm³ the engine is among the large-displacement diesels of its time, suited to timber, long-haul and construction work in Finland. For body builders and used-vehicle buyers, length, width, kerb weight and gross vehicle weight are the key figures for checking body, payload and registration; different chassis and wheelbase variants within the same type series shift these values noticeably. Numbers and letters after the type number denote cab, wheelbase and axle configuration; for unambiguous identification of a vehicle it pays to compare them with the vehicle papers.
Sisu SM300: Finnish heavy-duty lorry with a six-cylinder engine, 14,000 cc displacement, 298 kW output, a 13-speed gearbox and a length of 11,150 mm, built in 1984
Sisu is a Finnish manufacturer of heavy lorries and special vehicles whose chassis have long been built for Nordic long-haul transport and for military use. The SM300 stands in this register as a model of its own from 1984.
Read on 3 more paragraphs
The SM300 is driven by a six-cylinder engine of 14,000 cc displacement producing 298 kW. Power runs through a 13-speed gearbox, geared finely enough to cope with both long-haul cruising and pulling away loaded on a gradient. At a length of 11,150 mm and a width of 2,680 mm, the vehicle weighs 10,400 kg empty.
The kerb weight of 10,400 kg alone shows that, once bodywork and load are added, the SM300 belongs to the heavy N3 class above 12 t gross vehicle weight, for which a top speed of 90 km/h applies across the EU. The large displacement combined with moderate specific output is typical of engines built for durability on long hauls rather than for high revs, and it suits a chassis of this length, intended for a tractor-trailer or flatbed body.
Buying a Sisu of this era, it pays to check the clutch plates and the synchro rings inside the 13-speed gearbox, since both wear under intensive long-haul use. The six-cylinder engine with its 14-litre displacement warrants a look at the cooling system and turbocharger, and on a vehicle from the 1980s, frame corrosion under the cab is a common weak point worth checking before purchase.
Sources: SpecCodex-Register: Kennwerte des Modells SM300, Sisu (manufacturer)
Technical data
Engine
| Power | 298 kWcorrect |
|---|---|
| Displacement | 14,000 cm³correct |
Dimensions and weights
| Length | 11,500 mmcorrect |
|---|---|
| Width | 2,795 mmcorrect |
| Unladen weight | 11,150 kgcorrect |
Where this model stands
Power-to-weight ratio: 26.7 kW/t (298 kW / 11.2 t)
Stronger than 54% 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 SM300 CKH have?
The Sisu SM300 CKH delivers 298 kW.
How much does the Sisu SM300 CKH weigh?
The unladen weight is 11,150 kg.
What engine does the Sisu SM300 CKH have?
14,000 cm³ displacement.
What are the dimensions of the Sisu SM300 CKH?
11,500 mm × 2,795 mm.
When was the Sisu SM300 CKH built?
Production years: 1985.
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.
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This page carries 6 individual figures for this model. They come from 2 recorded sources; 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
Sources: Traficom — Finnish vehicle register (retrieved August 2026) · Wikipedia (CC BY-SA 4.0) (retrieved October 2026) · Values adopted and presented in our own form; changes from the source are possible. · How we check the data
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