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TM 5-4210-220-34
a.
Engine Parts (Standard Size, New) - Continued
MINIMUM
MAXIMUM
LIMITS
(10) Idler Gear
Backlash
................................................................................
0.0020"
0.0080"
0.0100"
Pre-load-Variation on pull 2 lbs. 11 oz .......................................................
1/2 lb
4 lb
(11) Crankshaft Timing Gear
Inside diameter
................................................................................
5.2490"
5.2510"
Clearance-gear-to-shaft .............................................................................
0.001" press
0.001" loose
Backlash
................................................................................
0.0020"
0.0080"
0.0100"
(12) Blower Drive Gear - 2.1:1 ratio
Backlash
................................................................................
0.0020"
0.0080"
0.0100"
Inside diameter (support bushing) ..............................................................
1.6260"
1.6265"
Hub diameter (at bearing) ..........................................................................
1.6240"
1.6250"
Hub-to-support bushing clearance .............................................................
0.0010"
0.0025"
0.0050"
Thrust washer thickness .............................................................................
0.2350"
0.2450"
Thrust bearing thickness ............................................................................
0.0590"
0.0610"
End thrust
................................................................................
0.0050"
0.0100"
0.0120"
(13) Cylinder Head
Flatness-transverse
................................................................................
0.0040"
Flatness-longitudinal
................................................................................
0.0055"
Distance between top deck and fire deck ...................................................
3.5560"
3.5680"
3.5360"
Water nozzles (former) ...............................................................................
0.0040"rec
Flush
Water nozzles (current) ..............................................................................
0.0150"rec
Flush
Cam follower bores
................................................................................
1.0620"
1.0630"
1.0650"
Exhaust Valve Insert Counterbore:
Diameter
................................................................................
1.4400"
1.4410"
Depth
................................................................................
0.3395"
0.3505"
(14) Exhaust Valve Seat Inserts
Outside diameter
................................................................................1.4415"1.4425"
Seat width
................................................................................
0.0470"
0.0770"
Valve seat runout
................................................................................
0.0020"
0.0020"
(15) Exhaust Valves
Stem diameter
................................................................................
0.3100"
0.3108"
0.3090"
Valve head-to-cylinder head 30 deg ........................................................... 0.023" recess
0.006" protr
0.038"
(16) Valve Guides
Height above cylinder head ........................................................................
0.6700"
0.7100"
Diameter-inside
................................................................................
0.3125"
0.3135"
0.3140"
Clearance-valve-to-guide ...........................................................................
0.0017"
0.0035"
0.0050"
(17) Valve Bridge Guides
Height above cylinder head ........................................................................
2.0400"
2.0400"
C-7
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