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T2  10-540-A,-B, -E, -G, -P 
(Angle Valve) 
T3  IO-540-K,-M, -S; TIO, LTIO-540-A, 
-F, -J, -N, -R (Large Mains-Angle 
Valve) 
T4  TIO-540-C, -E, -G, -H 
AF  IO-720 
BE  O, LO-360-E (76 Series) 

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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