Crews from Ichi Ban, Living Doll, Scarlet Runner, Calm and Chutzpah were all affected.
The race is due to start on Sydney Harbour at 1pm AEDT, 3pm NZT.
Chutzpah's Bruce Taylor, who is setting off on his 31st trip, was still hopeful that his missing crew would arrive in time to start the famous race.
"Gavin Gourley, one of my 25ers, is still to fly in,'' Taylor said.
New Zealand's only Sydney to Hobart representative Outrageous Fortune is set to sail on after undergoing some last-minute repairs.
The Auckland-based 45-foot boat had the work done on Saturday after a crack was detected in her second spreader - a spar that provides support to the mast.
- AAP