Perkins PDF engine manuals, specs, bolt torques at Barrington Diesel Club basic specs are open to everyone and include images, displacement, dimensions and weight, essential bolt tightening torques, the characteristics of the engine like its power and torque. Essential bolt tightening torques are the main bearing cap bolt torque, the connecting rod cap bolt torque and the cylinder head bolt torques, these are provided for each individual Perkins engine that we have in our library.