Jim Zorn took over for Dave Krieg in the second half last night in Seattle and threw two touchdown passes as the Seahawks took a 28-3 National Football League exhibition victory over the Detroit Lions.

Zorn, the left-handed 10-year veteran little used as Krieg's backup last season and supposedly in jeopardy of losing even that job this season, passed 21 yards to rookie Danny Greene and eight yards to Byron Walker for scores, both in the fourth quarter.

The Seahawks had taken the lead on a 36-yard run by Randall Morris in the third period after Detroit led at halftime on a 28-yard field goal by Ed Murray.

Seattle added a final touchdown with 6:46 remaining, on a two-yard touchdown run by rookie Steve Morgan.

* Dolphins: Quarterback Dan Marino, who left the Miami training camp in a contract dispute, said, "I did what I had to do" but wishes he was in practice preparing for the regular season, the Miami Herald reported yesterday.

"It would be nice if things would get worked out so I won't have to listen to the Buffalo game on the radio," he said about the Dolphins' next preseason game, tonight in Miami. "That doesn't seem real likely, though, does it?"

Marino, who set NFL records by passing for 5,084 yards and 48 touchdowns last season, reported to camp July 22. He told reporters he was happy to be in camp and had not considered holding out, then left two days later. He returned to his home in Pittsburgh, then returned to Miami last week to shoot a commercial.

Marino has been heavily criticized by local media and several polls found an overwhelming number of fans support Miami owner Joe Robbie's stance in the matter. Still, he told the Herald his mood was "upbeat" and "positive."

"The toughest part of all this is that I really want to be at practice getting ready to play," Marino said. "I mean, that's what I do."

Robbie has said he will not negotiate while Marino, who has two years remaining on his contract, is out of camp. Marino says he will not return without a new contract. Marino reportedly wants to be paid at least as much as San Francisco quarterback Joe Montana, who earns about $1 million per season.

* Saints: After walking out of training camp on Thursday, New Orleans linebacker Jim Kovach returned yesterday. Kovach, a seven-year veteran in the option year of a three-year contract, had stayed away from training camp ever since it opened 21 days ago. He wants to renegotiate his contract, saying he is being paid less than rookie linebacker Alvin Toles.

* Patriots: New England owner William H. Sullivan Jr. confirmed he has hired an investment banking firm, but said no commitment has been made to sell the club his family has owned since 1960.

The Boston Globe has reported the team and surrounding real estate would be put on the market for $100 million. That would make it the richest deal in professional sports history.

* Eagles: Philadelphia said it would continue to try to trade running back Wilbert Montgomery, who on Thursday failed a physical in Seattle that was a preliminary to a possible deal with the Seahawks. He has a knee injury that kept him out of the 1983 season.

* Browns: Cleveland Coach Marty Schottenheimer said rookie quarterback Bernie Kosar would start the first half tonight against Philadelphia. The coach said he would decide in the next two weeks who would start at quarterback in the season opener Sept. 8: Kosar, incumbent Paul McDonald or Gary Danielson.

* Bills: Former Cincinnati Bengals tight end Dan Ross will not play for Buffalo, General Manager Terry Bledsoe announced.

Bledsoe said the deal for Ross, who most recently played in the U.S. Football League, had been "aborted by the Bengals" after Cincinnati lost its starting tight end, M.L. Harris, to a wrist injury that may require surgery.

"Dan Ross is not coming," Bledsoe said. "The reason is the trade with Cincinnati couldn't be consummated under league rules which prohibit the trading of a free agent."

Under NFL rules, the teams could not make a trade until Ross was signed to a contract, but the two teams did have an agreement to allow Buffalo to talk with the former all-pro.