Place of Origin:
China
Brand Name:
CAT
Model Number:
3066
Complete six-cylinder diesel engine assembly for the CAT 320B, 320BL, 320C and 320C L excavator family. The 3066 engine — also sold under the Mitsubishi S6K, S6K-T, S6KT and S6K-DT designations — is a turbocharged inline-six displacing 6.373 litres from a 102 mm bore and 130 mm stroke. Intercooled builds are rated at 103 kW. Complete units are quoted against part numbers 287-0092, 287-0089, 222-8195 and 201-3878.
| Item | Specification |
|---|---|
| Product Name | Complete Engine Assembly |
| Series | 3066, six-cylinder range |
| Configuration | Inline six, four-stroke, water-cooled, turbocharged; intercooled on later builds |
| Displacement | 6.373 L (389 cu in) as calculated from bore and stroke |
| Bore and Stroke | 102 mm × 130 mm |
| Output | 103 kW published for the intercooled build; one summary gives approximately 104 kW / 140 hp at 1800 rpm |
| Construction | Two-piece cylinder head, two valves per cylinder, dry sleeve block (per one engine summary) |
| Applications | 320B, 320BL, 320C and 320C L; market headings also name the 318C, 321C and 325C |
| Engine Prefixes Named | 7JK, 6LK, 9KK and 6SW |
| Condition | New, rebuilt and used assemblies are all traded |
| Packaging | Steel skid, ports capped, moisture barrier, export crate |
| Category | Replaceable Part Numbers & Compatible Models |
|---|---|
| Complete Unit Numbers | 287-0092; 287-0089; 222-8195; 201-3878; 162-6206GE — all named in market headings |
| Second Designation | The same engine is quoted for Mitsubishi under S6K, S6K-T, S6KT and S6K-DT |
| Rebuild Kit | 34494-10011, quoted for S6K and S6KT in the 320B and 320L |
| Injector Nozzle | 1838171, named for the 3066 S6K in the 320B and 320C |
| Rocker Arm Shaft | 34301-01500 and 5I-7590, offered as a set |
| Oil Pump | 178-6539, supplied with the timing case cover |
| Machine Prefixes | 320C recorded under ANB, PAC, MAB, RAW, BDC, CLM, GNG, HKT, MAC, JPL, BEA and BGB |
The bore and stroke calculate to 6.373 L, fitment and market text say 6.4 L, and one engine summary says 6.6 L — a figure that belongs to the 3116 engine.
One market entry prints 103 kW, another 120 kW at 2000 rpm, one summary 140 hp, and a further entry prints a range well above 380 kW for the same engine.
A forum note states that Japanese-built 320B and 320C machines carry the unit under a second maker badge, while European and United States builds carry the 3066 designation.
The engine is traded both with and without intercooling, described in the market as the old type and the intercooled type.
Market entries pair this engine with the 3306T and with the E200B, and two more group it with the C6.4 designation.
Complete units mostly sit between 2,000 and 6,200 per piece, rebuilt sets at 3,400 to 3,600, short and long blocks from 1,000 to 2,100, alongside one listing printed at 128,928 per piece.
The 320B, 320BL, 320C and 320C L, with market headings also naming the 318C, 321C and 325C. Every 320C machine prefix recorded here is listed as powered by this engine.
The 6.373 L figure comes from the 102 mm × 130 mm bore and stroke, 6.4 L is the rounded figure used in fitment and market text, and the 6.6 L figure belongs to the 3116 — a different engine that shares the same pages.
Yes. It is quoted for Mitsubishi as S6K, S6K-T, S6KT and S6K-DT, and kit number 34494-10011 for Mitsubishi is listed against the 320B, so the two names describe one unit.
The intercooled build is the later one, and the engine plate states which version left the factory.
287-0092, 287-0089, 222-8195 and 201-3878 all appear in market headings, and the engine plate decides.
The engine prefix and serial number, the machine model with its serial, and a photo of the engine plate.
3066, 3066t, s6k, s6kt, s6k-t, s6k-dt, 6.373l, 6.4l, 389ci, 102mm bore, 130mm stroke, six cylinder inline six, turbocharged, intercooled, 103kw, 138hp, 104kw, 140hp, 287-0092, 2870089, 287-0089, 222-8195, 201-3878, 162-6206ge, 178-6539, 34301-01500, 5i-7590, 1838171, 34494-10011, 7jk, 6lk, 9kk, 6sw, complete engine assembly, diesel engine for CAT 320b, 320bl, 320c, 320cl, 318c, 321c, 325c excavator, replacement engine for mitsubishi, 3116, 3054c
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