Cummins 4B 4BT 4BTA key engine specs and bolt torques at Barrington Diesel Club. Basic specs are open to everyone and include images, displacement, dimensions and weight, key bolt tightening torques, the characteristics of the engine like its power and torque.Key bolt tightening torques are the main bearing cap bolt torques, the connecting rod cap bolt torques and the cylinder head bolt torques. Among the manuals and literature we have for this engine are the workshop manual, parts book and spec sheets. We provide engine specs, bolt torques, manuals and technical data for many makes and models of diesel engines.