Tommy Biershenk, Mark Hensby and Barry Cheesman all carded rounds of 7-under-par 65 to share third place at 10-under.
Kribel came out of the gate with three birdies in his first five holes after opening the second round on the back nine at The Champions Club. He birdied the par-5 second to get to 4-under on his round but promptly dropped a shot at the next.
At the 320-yard, par-4 fourth, Kribel's drive landed three feet from the hole, where he ran home the putt for eagle. He birdied his next two holes, five and six, to match Delsing in the top spot.
'I felt like I needed to get off to a good start to try to catch some of the guys already passing me before I teed off today,' said Kribel, who is playing this year under a medical exemption from back problems in 2001. 'You had to go low today whereas yesterday was a day of survival.'
Delsing was on fire early with four birdies and an eagle for a front nine, 6-under 36. He cooled on the back with a pair of birdies and a pair of bogeys, including a bogey at 18 which cost him sole possession of first, but still managed his second consecutive 66.
'All in all I didn't hit many bad shots,' said Delsing. 'I really could have birdied every hole, but I had a few mental errors out there, with the bogey on the last hole being one of them.'
Andrew McLardy (66), Jim McGovern (65) and Charles Raulerson (68) share sixth at minus nine.
Patrick Moore and Cliff Kresge both have the hope of earning a 'battlefield promotion' to the PGA Tour for winning three times in one season. Both made the 36-hole cut, which came at 2-under par. Moore stands at 4-under par, while Kresge advanced to the weekend on the number at 2-under-par 142.