David Ragan in 19th, a lap down, reported an overheating engine on lap 161.

Senna retired on lap 18 with an overheating engine.

Piloted by Captain Francis Pat Mulcahy it withdrew after 30 minutes with an overheating engine.

The crew would eventually abort the flight over San Francisco with an overheating engine.

Further down the order, Vettel made an unscheduled pit stop on lap 20 and retired two laps later with an overheating engine.

It wasn't the kind of thing you did with an overheating engine, but nobody was likely to notice: Hurricane pilots could see very little directly below them.

Several contenders suffered problems, including fast-qualifier Bob Strait, who pitted on lap 88 with an overheating engine.

Mother came screaming like some primitive, rampaging beast over the wide grassy plains, her overheating engines roaring their fury and pain.

Two-time winner Mike Eddy also lost several laps when he pitted under green for an overheating engine on lap 125.

Darel Dieringer would finish in last place due to an overheating engine on lap 3 out of 250.