DETROIT DIESEL 53
Specifications 1.0
ENGINE PARTS (Standard Size, New)
MINIMUM
MAXIMUM
LIMITS
Thrust washer thickness ( 6V-53) .......................................................... .
.0930"
.1030"
End play (blower drive gear shaft) ...........................................................
.0040"
.0060"
Governor Drive Gear
Backlash .................................................................................................
.0030"
.0050"
.0070"
Cylinder Head
Cam follower bore. ..................................................................................
1.0626"
1.0636"
Exhaust valve insert counterbore:
Diameter (4-valve head) ...................................................................
1.1590"
1.1600"
Exhaust Valve Seat Inserts
Outside diameter.....................................................................................
1.1605"
1.1615"
Seat width ...............................................................................................
3/64"
5/64"
5/64"
Valve seat runout ....................................................................................
.0020"
.0020"
EXhaust Valves
Stem diameter ........................................................................................
.2480
.2488"
Valve head-to-cylinder head:
Current 4-valve head ........................................................................
flush
.024" recess. .039" recess.
Valve Guide
Distance below top of head (machined for seal) ..................................... .
.150
.180
Diameter--inside (4-valve).......................................................................
.2505"
.2515"
Clearance--Valve-to-guide ......................................................................
.0017"
.0035"
.0050"
Rocker Arms and Shafts
Diameter--rocker shaft ............................................................................
.8735"
.8740"
Diameter--inside (rocker arm bushing) ....................................................
.8750"
.8760"
Diameter--inside (valve rocker arm bore) ............................................... .
.8753"
.8763"
Clearance--shaft-to-injector rocker bushing .............................................
.0010"
.0025"
.0040"
Clearance--shaft-to-valve rocker bore .....................................................
.0013"
.0028"
.0040"
Cam Followers
Diameter .................................................................................................
1.0600
1.0610"
Clearance--follower-to-current head ........................................................
0016"
.0036"
.0060"
Rollers and pins:
Clearance--pin-to-bushing .................................................................
.0013"
00021"
.010" Horiz.
Side clearance--roller-to-follower ..................................................... .
.0150"
.0230"
.0230"
1972 General Motors Corp.
February, 1972
SEC. 1.0 Page 7
