Model family · QSB6.7 Cummins
Cummins QSB6.7
A 6.7-litre family listed from 99 to 194 kW, with the clearest genset rows in the mid-range: G3 at 151/166 kW and G4 at 168/185 kW at 1,500 rpm.
The QSB6.7 family is listed as a 99–194 kW family on bore and stroke of 107 × 124 mm and a displacement of 6.7 litres. Its generator-drive rows are the most explicit in the mid-range of this catalogue: the QSB6.7-G3 is listed at 151 kW and 166 kW, and the G4 at 168 kW and 185 kW, at 1,500 rpm — paired figures at a single speed. The listing does not state the rating basis of either figure: name the basis your application requires when you enquire and have it confirmed for the exact variant. The pair is not a tolerance band, and neither figure should be read as a continuous or a standby rating without that confirmation.
Positioned between the B-series families and the C family (6CT/C8.3), the QSB6.7 is the catalogue's mid-power genset answer. Its listed family band, dimensions and genset rows are set out below; machine-variant tables are not published — ask for the table for your designation.
Listed range at a glance
| Model / line | Details on record |
|---|---|
| Family band | 99–194 kW · bore × stroke 107 × 124 mm · 6.7 L |
| QSB6.7-G3 (genset) | 151 / 166 kW at 1,500 rpm (two figures, one speed — ask which rating basis each stands on) |
| QSB6.7-G4 (genset) | 168 / 185 kW at 1,500 rpm (two figures, one speed — ask which rating basis each stands on) |
| Smaller sibling | QSB3.9: 63–97 kW, G2 63/70 kW and G3 79/88 kW at 1,500 rpm |
Reading the paired genset figures
Paired figures at a single speed — 151/166 kW for the G3 — are two listed figures for the same variant, not a production spread, and the listing does not state the rating basis of either. Do not guess it: a set bought on the wrong basis for its duty is mis-sized for the work. In your enquiry, state the duty (continuous prime or standby) in the same sentence as the model, and have the quoted figure's basis named in the quote. That one sentence prevents the most expensive QSB6.7 mistake.
For machine applications of the QSB6.7, the family band (99–194 kW) routes the enquiry but does not close it: ask for the per-variant table for your exact designation. Send the designation and the rating point your machine works at, and confirm the listed row for that variant before you order.
How buyers spec this line
- G3/G4 figures come in pairs at one speed, basis unstated — name your duty in the enquiry.
- Family dimensions on record: 107 × 124 mm, 6.7 L.
- QSB3.9 is the smaller sibling family (63–97 kW).
- Confirm the quoted figure's rating basis in writing before you order.
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 do the two G3 figures mean?
Two figures for the same variant at the same speed (1,500 rpm). The listing does not state either figure's rating basis — state the duty you need and have the applicable figure's basis confirmed in the quote.
QSB6.7 or 6CTA8.3 for a genset in this class?
The QSB6.7-G4 lists 168/185 kW at 1,500 rpm; the C8.3 family band tops at 194 kW in machine form. Send the duty and frequency and have both quoted on the same rating basis.
Is the QSB6.7 available for machines?
The family is listed across a 99–194 kW band. Per-variant machine tables are not published — ask for the table for your designation.
Related lines
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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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