Miles O'Keeffe was Tarzan in Bo Derek's 1981 Tarzan the Ape Man remake.
He had no dialog. This film is considered the worst of all the Tarzan films.

TARZAN THE APE MAN (1981 remake)
Cast: Bo Derek (Jane Parker), Miles O'Keeffe (Tarzan), Richard Harris (James Parker),
John Phillip Law, Akushula Selayah, Steve Strong, Maxime Philoe. Directed by John Derek; Screenplay by Tom Rowe and Gary Goddard
based on characters created by Edgar Rice Burroughs. PLOT: The Tarzan story from Jane's point of view. Jane Parker visits her father
in Africa where she joins him on an expedition. A couple of brief encounters with Tarzan establish a bond between her and Tarzan. When
the expedition is captured by savages, Tarzan comes to the rescue.