NOTE: In "Chart" column, a number appearing after a letter shows exception to the basic model. 
ii
PART1 DIRECTDRIVEENGINES 
SECTIONI CRANKCASE,CRANKSHAFT,CAMSHAFT 
Ref. Ref. Chart New Old 
500 501  A B-D-G-J-S-T-Y-BD-BE-AF 
B-G-J-S-T-Y-AF 
A B-D-G-J-S-T-Y-BD-BE 
T1-T3-AF G**-J-S-T-Y
*0-320-A,  -E Narrow Deck,
T1-T3-AF
T1-T3-AF 
S8-S10
T1-T3-AF
..............
A-B-D-G-J-S-T-Y-BD
SSP1776 500 955 A-B-B1-D-G*-BD-BE 
T1-T3-AF
...........
T1-T3-AF 
T1-T3-AF
T1-T3-AF S1-T-AF 
Nomenclature 
All MainBearings and Crankshaft 
Main Bearingsand Crankshaft (Thin WallBearing -.09 WallApprox.) 
Main Bearingsand Crankshaft (Thick WallBearing -.16 Wall Approx.) 
Diameter of Main BearingJournal on Crankshaft 
Diameter of MainBearingJournal on Crankshaft (2-3/8 in. Main) 
Diameter of MainBearingJournal on Crankshaft (2-5/8 in. Main) 
Diameter of Front Main Bearing on Journal on Crank-shaft (2-3/8 in. Main) 
Diameter of Front Main BearingJournal on Crank-shaft (2-5/8 in. Main) 
Crankcase Bearing Bore Dia-meter (All) (Thin WallBear-ing) (2-3/8 in. Main) 
Crankcase Bearing Bore Dia-meter (All Except Front) (ThickWallBearing)(2-3/8 in. Main) 
Crankcase BearingBore Dia-meter (Front Only) (Thin Wall Bearing)(2-5/8 in. Main) 
Crankcase Bearing Bore Dia-meters (AllExcept Front)(Thick WallBearing)(2-5/8 in. Main) 
Crankcase BearingBore Dia-meter (All) (Thin WallBear-ing) (2-5/8 in. Main) 
Crankcase Bearing Bore Dia-meter (Front Only) (Thin Wall Bearing)(2-3/8 in. Main) 
Connecting Rod Bearingand Crankshaft 
Diameter of Connecting Rod Journal on Crankshaft (2-1/8 in.) 
1-1 
Dimensions Mfr. Min. 
& Max. 
2.3735 
2.3745 
2.6245 
2.3750 2.3760 
2.6245 2.6255 
2.566 
2.567 
2.6865 2.6875 
2.816 
2.817 
2.9365 2.9375 
2.816 
2.817 
2.566 
2.567 
2.1235
2.125 
Clearances 
Mfr.  
Serv.  Min.  Serv.  
Max.  &  Max.  
Max.  
.0025L  
.055L  .0060L 
.0015L .0045L .0060L 
.0011L .004-1L .0050L 
(E) (E) (E) (E) (E) 2.5685 2.6890 2.8185 
2.9390 2.8185 2.5685 
.0008L .0038L .0050L 
(E)
SERVICE TABLE OF LIMITS 
PART 1 DIRECT DRIVE ENGINES SECTIONI CRANKCASE,CRANKSHAFT,CAMSHAFT 
Ref. Ref. Chart New Old 
501  S-T-AF A-B-D-G-J-S-T-Y-BD-BE 
 
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