ENGINE POWER REQUIREMENTS
Each bus shall be furnished with an engine that meets or exceeds the following minimum requirements, when tested at or above the gross vehicle weight rating (GVWR) required for a given bus capacity and with all engine related accessories on and operating.
Acceleration from zero to fifty miles per hour (0 - 50 mph) in sixty seconds or less.
Grade ability of one-and-one-half percent (1.5%) minimum at fifty miles per hour (50 mph).
Grade ability of five percent (5%) minimum at twenty-five miles per hour (25 mph).
Start ability of twenty percent (20%) minimum.
Component Placement: The exhaust pipe, muffler, and tail pipe shall be mounted under the bus and attached to the chassis frame. If the exhaust system is less than 12” from the fuel tank, a metal shield must be installed.
Tailpipe Exit: The tailpipe shall not exit the side of the bus anywhere within twelve inches (12”) of a vertical plane through the center of the fuel filler opening and perpendicular to the side of the bus, unless protected with a metal shield to divert spilled fuel away from tailpipe. The tailpipe shall exit to the left side or left rear of the bus whenever possible. If tailpipe does not exit through the bumper, the gap between top of tailpipe at exit point of the vehicle must not be more than 2" below the bottom of the side panel or rear bumper.
FRAME SIDE MEMBERS
Each frame side member shall be of one-piece (1-piece) construction between the rear most spring hanger and the forward most spring hanger. If the frame side members are extended, such extension shall be designed, furnished, and guaranteed by the installing manufacturer. Either the chassis or body manufacturer shall make the installation. Extensions of frame lengths are permissible only when such alterations are welded on behind the hanger of the rear spring. This specification does not permit wheel base extensions. Any welding, heating (for frame straightening or repairs), or the drilling of holes in chassis frame members shall be in accordance with chassis manufacturer’s recommendations, and shall not compromise the structural integrity of the bus.
FRONT AXLE WHEEL BEARINGS AND SEALS
All school buses except Type A shall have oil lubricated front axle wheel bearings and seals.