Place of Origin:
China
Brand Name:
CAT
Model Number:
312C S4K
Complete four-cylinder diesel engine assembly for the CAT 312C excavator, published by the manufacturer as the 3064T and quoted for Mitsubishi as the S4KT. The unit displaces 4.249 L (259 cu in) with a 102 mm bore and 130 mm stroke, is turbocharged, and is rated 70 kW gross / 67 kW net at 1950 rpm. Injector 193-2749 is specified for this engine across the 311C, 312C and 320C.
| Product Name | Complete Engine Assembly |
|---|---|
| Designations | 3064 and 3064T for CAT; S4K and S4KT for Mitsubishi |
| Configuration | Inline four, four-stroke, water-cooled diesel |
| Displacement | 4.249 L / 259 cu in |
| Bore and Stroke | 102 mm by 130 mm |
| Aspiration | Turbocharged |
| Output | 70 kW gross and 67 kW net at 1950 rpm in the 312C; 50 to 68 kW across industrial builds |
| Machines | Quoted for CAT in the 311C, 312C and 313C |
| Fuel System | Direct injection; pump and injector numbers fixed by the plate |
| Condition | New, rebuilt, used and long block forms are all traded |
| Packaging | Steel skid, ports capped, moisture barrier, export crate |
| Injector | 193-2749, also written CA1932749 and 1932749, quoted for the 3064 and 3066 in the 311C, 312C and 320C |
|---|---|
| Second Injector Number | 212-8470 listed against the same engines and described as suitable for Mitsubishi on this build |
| Designation Set | 3064, 3064T, S4K, S4KT and 3064-T appear for this engine; 3066 and S6K are the six-cylinder relative |
| Related Components | Cylinder head; head gasket set; piston and liner kit; bearings; injector 193-2749; injection pump; turbocharger; oil pump; water pump; overhaul kit; long block |
One widely used specification site lists a 3046 T against the 312C. The 3046 is a five-litre six-cylinder used in the larger 315B family, while the machine manufacturer publishes the 3064T for the 312C.
A market heading describes this engine as a six-cylinder 7.2-litre rebuild. The 3064 is four cylinders at 4.249 litres.
The 3066 is 6.4 litres on six cylinders, and C4.2, C4.4, C6.4 and C6.6 sit in the same headings. None of them is this engine.
Headings pair the S4K with the 320C, E320B, E200B and E320D, machines that carry the 3066 or the C6.4 instead.
Units appear from about 6300 CNY to 60800 CNY per piece, most of them between 12000 and 33000 CNY.
The machine manufacturer publishes the 3064T, a four-cylinder turbocharged unit rated 70 kW gross and 67 kW net at 1950 rpm. Some third-party specification sites put a 3046 T against the same model, but the 3046 is a five-litre six-cylinder belonging to the 315B family and does not belong in this machine.
Yes. The four-cylinder unit is sold for CAT as the 3064 and 3064T and for Mitsubishi as the S4K and S4KT, and market entries for the same assembly carry both names. Because the S4K also exists without a turbocharger, the T on the plate is what separates the two builds.
Headings in this market merge neighbouring designations. The 3066 is the six-cylinder relative at 6.4 litres, and C4.2, C4.4, C6.4 and C6.6 appear on the same lines. A 7.2-litre or six-cylinder description does not match the 102 mm by 130 mm four-cylinder unit published for this machine.
193-2749 is quoted for the 3064 and 3066 in the 311C, 312C and 320C, and 212-8470 is also listed for the same engines.
It is listed for CAT in the 311C and 313C as well as the 312C.
The engine plate and the machine serial, photographed together.
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