into the crankweb. The main bearings have whitemetal shells, and the
main bearing caps are held down by a pair of jack bolts in the RTA84C
and by a pair of elastic holding-down studs in the RTA96C. The crosshead
bearing is designed to the same principles as for all other RTA engines;
it also features a full-width lower half bearing. The crosshead bearings
have thin-walled shells of whitemetal to yield a high load-bearing capacity.
Sulzer low speed engines retain a separate elevated-pressure lube oil
supply to the crosshead; this provides hydrostatic lubrication which
lifts the crosshead pin off the shell during every revolution to ensure
that sufficient oil film thickness is maintained under the gas load:
crucial to long term bearing security.