DETROIT DIESEL 53
S p e c i f i c a t i o n s 1.0
ENGINE PARTS (Standard Size, New)
MINIMUM
MAXIMUM
LIMITS
Blower Drive Gear
Backlash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.0050"
.0030"
.0070"
End play (blower drive gear shaft) . . . . . . . . . . . . . . . . . . . . . . . . . .
.0040"
.0060"
Governor Drive Gear
Backlash . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.0030"
.0050"
.0070"
Cylinder Head
Cam follower bore (current) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.0636"
1.0626"
Cam follower bore (former) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.0630"
1.0620"
Exhaust valve insert counterbore:
Diameter (4.valve head) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1590"
1.1600"
Exhaust Valve Seat Inserts
Outside diameter (4.valve) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1615"
1.1605"
.0781"
Seat width,................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.0781"
.0468"
Valve seat runout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .
.0020"
.0020"
Exhaust Valves
Stem diameter (current 4valve) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.2488"
.2480"
Stem diameter (former 4-valve) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.2475"
.2485"
Valve head-to-cylinder head:
Current 4-valve head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.024" recess.
039" recess.
flush
Former 4-valve head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.006" protr.
.018" recess.
033" recess.
Valve Guides
Distance below top of head (plain guide)
.0400"
.0100"
Distance below top of head (machined for seal)
.2200"
.1900"
Diameter--inside (4-valve) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.2515"
.2505"
Clearance--Valve-to-guide (current 4.valve) . . . . . . . . . . . . . . . .
.0035"
.0050"
.0017"
Clearance--Valve-to-guide (former 4valve) . . . . . . . . . . . . . . . .
.0040"
.0050"
.0020"
Rocker Arms and Shafts
Diameter--rocker shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.8740"
.8735"
Diameter--inside (rocker arm bushing) . . . . . . . . . . . . . . . . . . . . . . . .
.8760"
.8750"
Diameter--inside (valve rocker arm bore) . . . . . . . . . . . . . . . . . .
.8763"
.8753"
Clearance--shaft-to-injector rocker bushing. . . . . . . . . . . . . . . . . . .. . .
.0040"
.0025"
.0010 "
Clearance--shaft-to-valve raker bore . . . . . . . . . . . . . . . . . . . . . . . .
.0040"
.0028"
.0013"
Cam Followers
1.0610"
Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.0600"
.0060"
.0036"
Clearance--follower-to-current head . . . . . . . . . . . . . . . . . . . . . . .
.0016"
.0060"
Clearance--follower-to-former head . . . . . . . . . . . . . . . . . . . . . .
.0010"
.0030"
Rollers and pins:
Clearance--pin-to-bushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.010" Horiz.
.0013"
.0021"
Side clearance--roller-to.follower ..............................,...
.0230"
.0150"
.0230"
April, 1974
SEC. 1.0 Page 7
