1981 Peterbilt 310 Engine: 7L L6 DIESEL; Position: Alternator;. 1982 Peterbilt 310 Engine: 7L L6 DIESEL; Position: Alternator;. 1983 Peterbilt 310 Engine: 7L L6 DIESEL; Position: Alternator;. 1984 Peterbilt 310 Engine: 7L L6 DIESEL; Position: Alternator;.