TABLE OF SPECIFICATIONS, NEW CLEARANCE AND WEAR LIMITS

TABLE OF SPECIFICATIONS, NEW CLEARANCE AND WEAR LIMITS - Continued

EXCEPTIONS TO STANDARD BOLT AND NUT TORQUE SPECIFICATIONS

Maintenance Manual For Roller Motorized, Steel Wheel2 Drum - 2 Page Navigation
279

DETROIT DIESEL 53

SPECIFICATIONS 1.0

ENGINE PARTS (Standard size, New )

MINIMUM

MAXIMUM

LIMITS

Blower Drive Gear

Backlash .............................................................................. .0030"

.0050"

.0070"

End play (blower drive gear shaft) .................................. ..... .0040"

.0060"

Governor Drive Gear

Backlash .............................................................................. .0030"

.0050"

.0070"

Cylinder Head

Cam follower bore (current) .................................................. 1.0626"

1.0636"

Cam follower bore (former) .................................................. 1.0620"

1.0630"

Exhaust valve insert counterbore:

Diameter (4-valve head) ....................................................... 1.1590"

1.1600"

Exhaust Valve Seat Inserts

Outside diameter (4-valve) .................................................. 1.605"

1.1615"

Seat width ............................................................................ .0468"

.0781"

Valve seat runout ................................................................ .0020"

.0020"

Exhaust Valves

Stem diameter (current 4-valve) . ......................................... .2480"

.2488"

Stem diameter (former 4-valve............................................. .2475"

.2485"

Valve head-to-cylinder head:

Current 4-valve head...................................................... flush

.024" recess.

.039" recess

Former 4-valve head ...................................................... .006" protr.

.018" recess.

.033" recess.

Valve Guides

Distance below top of head (plain guide) .............................. ..0100"

.0400"

Distance below too of head (machined for seal) ................... ..1900"

.2200"

Diameter--inside (4-valve) .................................................. .2505"

.2515"1

Clearance--Valve-to-guide (current 4-valve) ......................... .0017"

.0035"

.0050"

Clearance--Valve-to-guide (former 4-valve).......................... ..0020"

.0040"

.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'"

1.0600'

Clearance--follower-to-current head...................................... 0.0016"

.0036" .

.0060"

Clearance--follower-to-former head ...................................... 0.0010"

.0030"

.0060"

Rollers and pins:

Clearance--pin-to-bushing .............................................. 0013"

.0021

.010"

Horiz.

Side clearance--roller-to-follower ................................... 0150"

.0230 "

April, 1974

SEC. 1.0 Page 7

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