All the SM range (except for the SM5) initially used the 597 engine manufactured at Saviem's Limoges plant, and later its evolutions: the 797 and the 798.
The 597 was  introduced in 1967, and it was also used for trucks of the MAN's medium range.
It was a 5.27-litre atmospheric straight-six unit with a maximum power output of 135 PS (133 bhp; 99 kW) at 2,900 rpm and a torque of 392 N⋅m (289 lb⋅ft) at 1,600 rpm.
It incorporated MAN-licensed direct injection technology and was only used on the SM6 and some military vehicles from 1970 onwards.
In 1970, the SM range mounted the 797 and 798 (also called 597-05 and 598) engines, derived from the 597.
The 797 (introduced in 1970) was a 5.49-litre atmospheric straight-six engine with a power output (at launch) of 145 PS (143 bhp; 107 kW) at 2,900 rpm and a torque of 402 N⋅m (296 lb⋅ft) at 1,700 rpm.
The 797  was used in the SM7 and SM8 models.
The 798 (used only on some versions of the Saviem SM8 4x4) was similar to the 797, but it was turbocharged and had a power output of 170 PS (170 bhp; 130 kW) at 2,900 rpm and a torque of 455 N⋅m (336 lb⋅ft) at 1,800 rpm.
The SM5 used an evolution of the 712-01 engine used on the SG range.
All the SM range (except for the SM5) initially used the 597 engine manufactured at Saviem's Limoges plant, and later its evolutions: the 797 and the 798. The 597 was  introduced in 1967, and it was also used for trucks of the MAN's medium range. It was a 5.27-litre atmospheric straight-six unit with a maximum power output of 135 PS (133 bhp; 99 kW) at 2,900 rpm and a torque of 392 N⋅m (289 lb⋅ft) at 1,600 rpm. It incorporated MAN-licensed direct injection technology and was only used on the SM6 and some military vehicles from 1970 onwards. In 1970, the SM range mounted the 797 and 798 (also called 597-05 and 598) engines, derived from the 597. The 797 (introduced in 1970) was a 5.49-litre atmospheric straight-six engine with a power output (at launch) of 145 PS (143 bhp; 107 kW) at 2,900 rpm and a torque of 402 N⋅m (296 lb⋅ft) at 1,700 rpm. The 797  was used in the SM7 and SM8 models. The 798 (used only on some versions of the Saviem SM8 4x4) was similar to the 797, but it was turbocharged and had a power output of 170 PS (170 bhp; 130 kW) at 2,900 rpm and a torque of 455 N⋅m (336 lb⋅ft) at 1,800 rpm. The SM5 used an evolution of the 712-01 engine used on the SG range.
Saviem SM