Advantages of Jack bolts

• Jack bolts are used in Sulzer RTA engines
• Tie rod should always be as close as possible to the crankshaft
• Adv of bringing tie rod closer is to reduce the bending moment on transverse girder.
• If there is bending moment on transverse girder cracks would propagate ie why Sulzer has employed a jack bolt so that the bearing top cover is held in position by the jack bolts.
• In B & W main bearing top cover is in two pieces.ie bearing cover  or keep in of 2 pieces.