TM 5-3810-206-35
Manufacturer's
Maximum
dimensions
Desired clearance
allowable
Component
and tolerance in inches
wear or
clearance
Minimum
Maximum
Minimum
Maximum
Thickness of thrust rings ----------------------------------------------------------
0.099
0.100
Width of groove in sleeve ---------------------------------------------------------
0.128
0.130
Side clearance in groove of sleeve with two ring seals installed
side by side ----------------------------------------------------------------------
0.002
0.006
Minimum ring seal width -----------------------------------------------------------
--------------
------------
----------
------------
0.062
Maximum ring seal groove width -------------------------------------------------
--------------
------------
----------
------------
0.068
Valves:
Valve face angle 29 1/4 ----------------------------------------------------------
Valve seat angle 30---------------------------------------------------------------
Valve width:
Inlet-----------------------------------------------------------------------------------
--------------
0.076
Exhaust------------------------------------------------------------------------------
--------------
0.078
Valve height (top of valve to face of head with valve seated): ----------------
0.082
0.128
Inlet-----------------------------------------------------------------------------------
0.082
0.128
Exhaust------------------------------------------------------------------------------
0.082
0.128
Exhaust:
Clearance (hot) ---------------------------------------------------------------------
0.025
Clearance (cold) --------------------------------------------------------------------
0.028
Stem clearance in bushing--------------------------------------------------------
0.003
0.005
Maximum clearance with new valve ---------------------------------------------
--------------
------------
----------
------------
0.007
Inlet:
Clearance (hot) ---------------------------------------------------------------------
0.015
Clearance (cold) --------------------------------------------------------------------
0.017
Stem clearance in bushing--------------------------------------------------------
0.003
0.005
Maximum clearance with new valve ---------------------------------------------
--------------
------------
0.007
Valve Lifters:
Bore diameter-----------------------------------------------------------------------
1.3125
1.3135
Lifter diameter ----------------------------------------------------------------------
1.3100
1.3110
Maximum clearance----------------------------------------------------------------
--------------
------------
----------
------------
0.009
Valve Springs:
Force when compressed to 21 11/32 in -----------------------------------------
53.20
58.80
Water Pump:
Clearance between impeller and housing ---------------------------------------
0.005
0.015
Table 1-2. Engine Repair and Replacement Standards For Engine Model 687C-18-ES
Manufacturer's
dimensions
Desired clearance
Maximum
Maximum
Component
and tolerance in inches
allowable
allowable
wear
clearance
Minimum
Maximum
Minimum
Maximum
Valves:
Valve clearance (cold) --------------------------------------------
0.012
0.014
Valve guide-to-stem clearance ----------------------------------
0.001
0.003
-----------
------------
------------
0.007
Rocker arm-to-bushing clearance-------------------------------
0.002
0.003
-----------
------------
0.006
Rocker arm-to pivot clearance-----------------------------------
0.001
0.002
-----------
------------
------------
0.005
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 position -----------
----------
2 3/8 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
Compression ring axial clearance-------------------------------
0.006
0.0075
-----------
------------
------------
0.020
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
1-5
