For Engine Model 687C-18-ES--Continued
Manufacturer's dimensions Desired clearance Maximum
Maximum
Component
and tolerances in inches
allowable
allowable
Min
Max
Min
Max
wear
clearances
Rocker arm bushing-to-shaft clearance .......
0.001
0.004
0.008
Exhaust spring load with valve closed .........
------------
105 lb
Exhaust spring length with valve in closed ..
------------
2 3/8 in.
position ................................................
------------
1/32
Cam follower:
Cam follower roller-to-bushing clearance ....
0.002
0.003
------------ ------------ ------------
0.006
Cam follower bushing-to-pin clearance .......
0.001
0.002
------------ ------------ ------------
0.004
Piston and Piston Rings:
Piston size top .............................................
4.473
4.476
------------ ------------ 4.477
Piston size bottom .......................................
4 494
4.496
------------ ------------ 4.497
Piston-to-head compression clearance .......
0.012
0.030
------------ ------------ ------------
0.045
Wrist pin bore, piston. ..................................
1.7490
1.7495
Compression ring gap .................................
0.023
0.028
Oil ring gap ..................................................
0.016
0.028
------------
------------
------------
0.020
Compression ring axial clearance ...............
0.006
0.0075
2...................................................................
0.004
0.0055
------------ ------------ 0.020
3 and 4.........................................................
0 002
0.0035
------------ ------------ 0.020
Oil ring axial clearance ................................
0.001
0 0025
------------ ------------ 0.006
Liner size .....................................................
4.500
4.501
Connecting Rods:
Connecting rod end play on crankshaft .......
0.013
0.033
Connecting rod bushing-to-pin clearance ....
0.0015
0.0030
------------
------------ ------------
0.008
Bearing clearance ........................................
0.002
0.0035
------------
------------ ------------
0.008
Crankshaft:
End thrust ....................................................
0.008
0.016
------------ ------------ 0.020
Main bearing oil clearance ...........................
0.002
0.0045
------------ ------------ ------------
0.008
Camshaft:
End thrust ....................................................
0.010
0.015
------------ ------------ 0.025
Bearing oil clearance ...................................
0.003
0.007
------------ ------------ ------------
0.010
Idler Gear:
Gear-to-bearing oil clearance ......................
0.002
0.004
------------ ------------ ------------
0.006
Bearing-to-stub shaft oil clearance ..............
0.002
0.004
------------ ------------ ------------
0.006
Gear thrust clearance ..................................
0.006
0.014
------------ ------------ 0.020
Supercharger Drive:
Gear-to-bearing oil clearance ......................
0.004
0.006
------------ ------------ ------------
0.010
Drive bearing-to-bearing clearance - ...........
0.002
0.008
------------ ------------ ------------
0.010
Carrier oil clearance ....................................
0.002
0.004
Drive gear thrust clearance .........................
0.004
0.018
------------
------------
------------
0.023
Timing Gears:
Backlash (gear-to-gear) ...............................
0.003
0.008
------------
------------
0.012
Injection Pump:
Shaft end clearance .....................................
0.006
0.022
Injection lever bushing-to-pivot pin clearance
0.001
0.004
------------
------------
------------
0.008
Fuel Injector:
Fuel injector tip hole size .............................
0.028
0.031
Superchargers:
Bearing bore--..............................................
------------
1.3765
End thrust ....................................................
------------
0.005
j. Generator Repair and Replacement Standards.
clearances, and the maximum allowable wear and
clearance.
Table 1-3. Generator Repair and Replacement Standards
For Engine Model 687C-18-ES
Manufacturer's dimensions Desired clearance Maximum
Maximum
Component
and tolerances in inches
allowable
allowable
Min
Max
Min
Max
wear
clearances
End play
......................................................
0.003
0.010
Commutator maximum out-of-round ...................
0.000
0.001
Mica undercut .....................................................
1/32"
3/64"
Bearing id
......................................................
0.6690
0.6693
AGO 20051A
1-6
