Navy's top-ranked defense was hurt by the loss of linebacker Mike Kronzer and defensive end Charlie Thornton, both with knee injuries suffered in Saturday's 9-0 victory over William and Mary.

Kronzer, a reserve who has been seeing about as much action as the two starting linebackers, is scheduled to undergo surgery today and will be out for the year. Thornton, a starter, is questionable for this week's game against Pittsburgh.

The 17th-ranked Midshipmen (20th in UPI) scored all their points in the second half to stay unbeaten in six games. Bob Tata's 27-yard field goal late in the third period got the Middies on the board after a 46-yard punt return by Phil McConkey. Larry Klawinski ran 33 yard with 4:39 left in the game for the Mid touchdown.

Navy's defense picked off three W&M passes as it recorded its third shutout of the season.

Billy Sims rushed for a career-high 231 yards Saturday to lead top-ranked Oklahoma to a 34-6 Big Eight football victory over host Iowa State for the unbeaten Sooners' seventh triumph of the season.

Oklohama quaterback Thomas Lott, who missed last weekend's one-point victory over Kansas with an injuriry, ran for two first-half touchdowns. Uwe von Schamann booted a pair of field goals and added four extra points to raise his NCAA-record to 103 straight.

Second-ranked Penn State got a 283-yard passing effort from Chuck Fusina. who completed two of his four scoring passes to split end Scott Fitskee in a 45-15 gomp over Syracuse. Matt Bahr kicked a 50-yard field goal for his 15th success in 17 attempts this year.

Third-ranked Arkansas was not as fortunate, suffering a 28-21 loss to eighth-ranked Texas for the first Razorback setback in five games this season Arkansas had won 11 straight over two seasons.

Johnny (Lam) Jones caught touchdown passes of four and five yards from Randy McEachern, who also connected with freshman tight end Lawrence Sampleton on a 36-yard payoff toss.

Texas led at intermission, 20-7, but the Razorback drove 69 ad 62 yards for touchdown on their first two possessions* of the second half for a 21-20 lead. Midway through the final period, the Longhorns, with a 32-yard catch by Sampleton, marched 60 yards for the winning score on Jones' five-yard reception.

The remainder of the top 10 teams scored victories, with sixth-ranked Maryland swamping Wake Forest, 30-0. The Terrapin defense forced seven Deacon turnovers and allowed the visitors past midfield just once under their own momentum.

Steve Atkins rushed for 104 yards and scored twice, giving the senior tailback a school record 28 touchdowns. Alvin Maddox caught a 31-yard scoring pass from backup quaterback Mike Tice and twice plunged for scores from a yard out.

Maryland did not emerge unscathed; 210-pound fullback Mickey Dudish, the team's best backfield blocker, suffered a badly sprained ankle. Backup Steve Koziol did not dress for the game because of an injury, scoring tailback Maddox and third-stringer Rick Fassano to split time at the spot for the remainder of the game.

The interception was 10th-ranked UCLA's best weapon as the Bruins picked off 10 California serials enroute to a 45-0 whitewash in Berkeley. Conerback Brian Baggot returned interceptions 61 and 62 yards for touchdowns.

Previously winless Baylor got a 207-yard rushing performance from freshman Walter Abercrombie in his initial varsity game to stun 12th-ranked Texas A&M for the second straight week, 24-6.

Stanford quarterback Steve Dils, the No. 1 passer in major college ranks, threw for 430 yards and five touchdowns to lift the Cardinals to a 43-27 PAC-10 verdict over Washington State.

Dils completes 32 of 51 while his Cougar counterpart, Jack Thompson, completed 24 of 34 for 274 yards and two touchdowns.

In night games, Otis Anderson returned a kickoff 100 yards and added a 53-yard touchdown run while safety Gene Coleman intercepted a two-point conversion attempt by Utah State to lead Miami of Florida to a 17-16 victory over the Aggies; Mike Conway kicked four field goals and Charles Alexander scored on a 44-yard pass to lift Louisana State to a 21-0 triumph over error-prone (seven turnovers) Kentucky; Greg Wilson's 94-yard return of the opening kickoff and Guy Prather's 32-yard interception return for touchdowns propelled Grambing (5-0-1) to a 13-7 upset of Jackson State (6-1), the nation's top-rated Division IAA team.

In other games, Winston-Salem got a 207-yard rushing performance from Timmy Newsome for its 20th straight victory, 28-6 over Elizabeth City State, in a Central Intercollegiate Athletic Association game; Tennessee State ended Florida A&M's 17-game win streak with a 24-21 victory over the Rattlers.