Hino FB14 headlight bulbs utilize H4651 size for high beam and H4656 or H4652 sizes for low beam applications. The replacement chart covers 1987 to 1991 vehicle production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hino FB14 uses H4651, H4652, and H4656 bulb types across its high beam and low beam headlight positions for the 1987-1991 model years. All three are ANSI-standardized sealed beam units recognized in both the United States and Canada.
All three bulb types share the same 4x6-inch rectangular sealed beam format and operate on 12 volts. In a sealed beam unit, the lens, reflector, and filament are fused into a single glass assembly, meaning the entire unit is replaced rather than an internal bulb.
The H4652 is a variant of the H4651. Both serve the same physical form factor, though they are distinct ANSI part numbers and are not confirmed as interchangeable without verifying the specific application.
The high beam position on the Hino FB14 uses the H4651 consistently across all five model years from 1987-1991, indicating no variation in that position throughout the production run covered by these specifications.
The low beam position shows a split fitment. The H4656 is specified for the 1987 and 1991 model years, while the H4652 is specified for 1988-1990. Substituting one for the other without confirming ANSI equivalence risks incorrect fitment.
Because H4651 and H4656 share the same physical 4x6-inch sealed beam housing, they may appear externally similar, but their ANSI designations reflect differences in light output characteristics such as candela distribution and filament configuration, which affect beam pattern performance.
The use of ANSI-coded sealed beam units means replacements are sourced by matching the alphanumeric code rather than by measuring the housing, as the code itself defines the standardized size and electrical specification.