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SAE WEB ADDRESS 
SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001STANDARD Submitted for recognition as an American National Standard J617REV.MAY92Issued 1916-03
Revised
1992-05Superseding J617 JUN76
(R) ENGINE FL YWHEEL HOUSING AND MATING TRANSMISSION HOUSING FLANGES
Foreword—This Document has also changed to comply with the new SAE Technical Standards Board format.
1.Scope—This SAE Standard specifies the major dimensions and tolerances for Engine Flywheel Housings and
the Mating Transmission Housing Flanges.  It also locates the crankshaft flange face or the transmis
sion pilot
bore (or pilot bearing bore) stop face in relation to housing SAE flange face.
This document is not intended to cover the design of the flywheel housing face mating with the engine
crankcase rear face or the design of housing walls and ribs.  Housing strength analysis and the selection of
housing materials are also excluded.
This document applies to any internal combustion engine which can utilize SAE No. 6 through SAE No. 00 size
flywheel housing for mounting a transmission.
1.1Purpose—This document is intended to achieve standardization in the design of "Engine Flywheel Housings"
and the "Mating T ransmission Housing" flanges to assure compatibility.
2.References
2.1Applicable Publications—The following publications form a part of this specification to the extent specified
herein.  The latest issue of SAE publications shall apply.
2.1.1
SAE P UBLICATIONS —Available from SAE, 400 Commonwealth Drive, Warrendale, P A 15096-0001.
SAE J542—Starting Motor Mounting (For Starter Mounting Pads on Flywheel Housing and Ring Gear
Face Location on Flywheels)
SAE J543—Starting Motor Pinions and Ring Gears (For Starting Motor Mounting Center Distance)
SAE J615—Engine Mountings (Side Pad and Arm T ype)
SAE J616—Engine Foot Mountings
SAE J621—Industrial Power T akeoffs with Driving Ring-T ype Overcenter Clutches
SAE J1033—Procedure for Measuring Bore and Face Runout of Flywheels, Flywheel Housings, and
Flywheel Housing Adapter
SAE J1172—Engine Flywheel Housing with Sealed Flanges
2.1.2ANSI AND ISO P UBLICATIONS—Available from ANSI, 11 West 42nd Street, New Y ork, NY 10036-8002.
ANSI B1.1—Unified Inch Screw Threads (UN and UNR Thread Form)
ANSI Y14.5—Dimensioning and T olerancing
ISO 7648—Flywheel housings for reciprocating internal combustion engines
ISO 7649—Road vehicles—Clutch housings for reciprocating internal combustion engines
3.Dimensions and Tolerances—Dimensions and tolerances shown are millimeter (inch).  Geometric symbols
used conform to ANSI Y14.5.
4.Engine Flywheel Housings—Figures and tables listed as follows furnish the dimensions and the hole
patterns for dry type engine flywheel housing:
Figure 1—Flywheel Housing Dimension and Hole Pattern (for 8, 12, 16, and 24 bolt hole patterns).
Figure 2—Flywheel Housing Flange Dimensions
Figure 3—Depth of Pilot Bore (Dimensions E)
T able 1 and 2—Flywheel Housing Dimension
For dimensions of "Engine Flywheels Housing with Sealed Flanges" (wet type housing), see SAE J1172.
发动机飞轮壳When designing the "Engine Flywheel Housing," refer to SAE J542, SAE J543, SAE J615, SAE J616, SAE J1033, SAE J1172, ISO 7648, and ISO 7649.
5.Mating Transmission Housing Flanges—Only the "SAE" flange area of the mating dry type transmission
housing is covered by this document.
The nominal male pilot diameter of the mating transmission housing flange shall be the same as the nominal diameter "A" of the flywheel housing, Figure 1.
For mating transmission housing flange dimensions, tolerances, hole sizes, and runout requirements, see Figure 4 and Table 1, Table 2, and T able 3.
FIGURE 1—FL YWHEEL HOUSING DIMENSIONS AND HOLE PATTERN, mm (in)
FIGURE 2—FLYWHEEL HOUSING FLANGE DIMENSIONS, mm (in)
FOR VARIOUS CRANKSHAFT—FL YWHEEL MOUNTING SYSTEMS