SAE J1857-1997 FLYWHEEL DIMENSIONS FOR TRUCK AND BUS APPLICATIONS.pdf

SURFACE REV.
VEHICLE J1857 JAN97
MENDED Issued 1987-05
monwealth Drive, Warrendale, PA 15096-0001
PRACTICE Revised 1997-01
Superseding J1857 MAY87
(R) FLYWHEEL DIMENSIONS FOR TRUCK AND BUS APPLICATIONS
1. Scope—Although not limited to, these flywheels are normally used on trucks considered as Medium-Duty
(Class 6 and 7), as well as Heavy-Duty (Class 8) trucks.
Purpose—This SAE mended Practice defines flywheel configurations to promote standardization of
clutch installation and mounting dimensions for flywheels used with pull type single- and twin-plate truck
clutches.
2. References
Applicable Publications—The following publications form a part of this specification to the extent specified
herein. Unless otherwise indicated, the latest issue of SAE publications shall apply.
SAE PUBLICATIONS—Available from SAE, monwealth Drive, Warrendale, PA 15096-0001.
SAEJ1033—Procedure for Measuring Bore and Face Runout of Flywheels, Flywheel Housings, and
Flywheel Housings Adapters
SAE J1731—Pilot Bearings for Truck and Bus Applications
SAE J1806—Clutch Dimensions for Truck and Bus Applications
3. Flywheel Specifications—This section covers mended flywheel dimensional specifications for several
different clutch and binations. Unless otherwise specified, dimensions listed are nominal. This
document applies to new flywheels and does not attempt to provide service machining limits for remachined
flywheels.
Flat Type Flywheels for Use with 14-in Single- and Twin-Plate Clutches (Typically Medium-Duty
Applications)—See Table 1 and Figure 1.
SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely
voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”
SAE reviews each technical report at