Larry Bowa hit a three-run homer, his second home run in five days, and Chuck Rainey and Bill Campbell pitched a seven-hitter as the Cubs beat the Philadelphia Phillies, 6-3, yesterday in Chicago.

Until this week, Bowa hadn't hit a ball over a fence since July 1978. He had two homers in 1980, both inside-the-parkers.

Rainey (3-3) gave up a bases-empty home run to Bo Diaz and a single to Garry Maddox in the second inning, but retired the next 16 before tiring in the eight, when Philadelphia scored two runs. Campbell struck out Gary Matthews with two on to end the threat.

The Phillies led, 1-0, on Diaz's homer until the fifth, Keith Moreland led off for the Cubs with a walk off Dick Ruthven (1-2), went to third on Ron Cey's double and scored on Jody Davis' fly.

In the Chicago sixth, Ryne Sandberg led off with a single, went to third on Bowa's single and scored on Bill Buckner's fly. Bowa also hit a fourth-inning double.

Cey led off the seventh with a single, went to third on Scot Thompson's single and scored when Ivan DeJesus bobbled Davis' grounderf. Two outs later, Bowa hit a 1-0 pitch over the left-field wall.

Following the game, Chicago Manager Lee Elia said he believed the controversy surrounding his public outburst April 29 was over. "I hope the fans and everyone else realizes there was nothing personal in what was said," he said.

Elia's job has been in jeopardy since his remarks following a loss to Los Angeles. General Manager Dallas Green of the Cubs said earlier this week that Elia's job was "safe until the weekend."

Bowa said it would be a mistake to fire Elia. "It wasn't his fault that we played so poorly at the start of the season," Bowa said.