Model family · Cummins N855
Cummins N855 — the NT855 family
The classic 14-litre family: QSNT variants from 175 kW and the NT855 table from the C250 at 187 kW to the NTA855-C360 at 269 kW.
The N855 family's listed data comes in two connected parts. The QSNT line is listed from the QSNT-C235 at 175 kW, on bore and stroke of 140 × 152 mm and a displacement of 14 litres. The NT855 table proper runs from the NT855-C250 at 187 kW to the NTA855-C360 at 269 kW, at 2,100 rpm. Together they describe one of the longest-serving engine families in the Cummins catalogue — the kind of engine that is still being replaced like-for-like in machines and gensets decades after installation.
That longevity is why this page exists as its own family page: N855 enquiries are almost always replacement or overhaul enquiries for an installed engine, where the variant code (C250 through C360, or the QSNT codes) and the 14-litre dimensions are the identity check. Cummins parts are listed as a separate line on this site — ask by part number which parts apply to your engine. The overhaul guide on the blog is written for exactly this decision — rebuild the N855 you have, or replace it.
Listed range at a glance
| Model / line | Details on record |
|---|---|
| QSNT-C235 | 175 kW · entry of the QSNT line · 140 × 152 mm, 14 L |
| NT855-C250 | 187 kW · entry of the NT855 table |
| NTA855-C360 | 269 kW · top of the listed NT855 table · at 2,100 rpm |
| Family dimensions | Bore × stroke 140 × 152 mm · displacement 14 L |
| Rating speed | Listed NT855 figures at 2,100 rpm |
Replacing or rebuilding an N855
Start with the variant code and the engine's condition. If the block and crank are sound, an overhaul quoted against a full parts list is often the rational route for this family — the blog guide on overhaul kits sets out the decision points. If the engine is being replaced, the variant code is the specification: a C360 is not a C250 with a different badge, and the quote should restate the exact variant, its rating at 2,100 rpm and the scope of supply.
For genset installations running an N855, note the listed figures are at 2,100 rpm working speeds. State the set's frequency and duty in the enquiry and have the applicable rating confirmed, rather than reading the machine-table figure as a genset rating — the same rule applied across this site's Cummins pages.
How buyers spec this line
- Variant code first: C250–C360 and QSNT codes are distinct rating steps.
- Listed dimensions: 140 × 152 mm, 14 L, figures at 2,100 rpm.
- Overhaul is a live option for this family — see the blog decision guide.
- Confirm genset ratings per duty and frequency; do not transpose machine rows.
Terms on record
Listed terms on record: complete engines and power units carry a delivery window of 15–30 days and a warranty of 1 year or 1,200 hours, whichever comes first, as published in the supplier's FAQ. Confirm the exact rating, scope of supply and delivery window for your model before you order.
Buyer questions
What is the N855's listed power span?
From the QSNT-C235 at 175 kW through the NT855 table to the NTA855-C360 at 269 kW, at 2,100 rpm.
Should I rebuild or replace my N855?
It depends on block and crank condition and parts availability for your variant. The overhaul kits guide on the blog works through the decision; either way, start from the variant code.
Are N855 parts still supplied?
Cummins parts are a listed line on this site. Send the part numbers for your variant and confirm availability per number.
Related lines
Cummins Engine Parts
The listed Cummins parts line — ask by part number.
View the line →Send the model designation, get a spec-matched quote
Tell us the exact model designation, quantity, destination port and the rating your application needs. Confirm the listed specification, price and delivery window for that model before you place an order.
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