TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 402 of 894
TRUCK SERVICE MANUAL
ENGINE
2.
Use light finger pressure at the rocker lever contact
surface to hold crosshead in contact with.valve stem
nearest the push tube.
Turn adjusting screw down until it
contacts its mating valve stem.
Note:
With new crossheads and guides, advance
adjusting screw one-third of one hex to straighten stem in
its guide and to compensate for slack in threads.
With
worn crossheads and guides, it may be necessary to
advance the screw as much as 1/2 of hex in order to
straighten the stem in its guide.
3.
Hold adjusting screw in position and torque locknut to
25 to 30 ft-lbs [3.5 to 4.1 kg m]; or, if ST-669 Torque
Wrench Adapter is used, tighten to 22 to 26 ft-lbs [3.0 to
3.6 kg m].
4.
Check clearance between crosshead and valve spring
retainer with wire gauge.
There must be a minimum of
0.020 inch [0.51 mm] clearance.
Rocker Lever Housing
1.
Position new rocker lever housing gasket on cylinder
head.
2.
Loosen locknuts and back off rocker lever adjusting
screws two or three turns.
Holding rocker levers in place,
position housing on heads with ball ends of rocker levers
fitting into their respective push tube sockets.
Install
lifting brackets and fan hub bracket support bell crank, if
used.
3.
Secure housing, brackets and support with
capscrews.
Torque in sequence, Fig.
14-9, to 55 to 65
ft-lbs [7.6 to 8.9 kg mi.
Fig.
14-9, (N11463).
Rocker lever housing torquing
sequence
Note:
On 80 deg.
tilt engines use ST-1182 Valve Spring
Spray Nozzle Locator to check that oil spray nozzles are
properly located.
Compression Release Lever
1.
Install dowel in cylinder block if removed.
2.
Position upper lever and bracket assembly to front
rocker arm housing and secure.
3.
Using screwdriver in slot in end of compression
release shaft, turn shaft clockwise until lifting notch
contacts a valve push tube collar, move compression
release shaft lever to middle of travel; secure with
clamping screw.
4.
Secure spring on cylinder head with capscrew; hook
spring in lever on compression release shaft.
Attach link
to lower and upper lever; secure with’ cotter pins.
Fuel Pump/Compressor Drive/Accessory Drive
Bar ’engine to No.
1 cylinder, TDC position (firing
stroke), continue rotating to 90 deg.
ATC.
In this
position, the two center-punched marks on drive gear will
mesh or index with two dash marks on camshaft gear.
This timing.
is required so external timing marks on
accessory drive pulley will be properly aligned with timing
mark on gear case to show valve and injector adjustment
positions, keyway of drive shaft will be at top.
Secure
drive to cylinder block.
Using a scrap gear case cover,
fabricated as illustrated in Fig.
14-10, check accessory
drive gear backlash.
1.
Attach a dial indicator gauge to the block with plunger
on accessory drive gear tooth.
Fig.
14-10.
Rotate gear
as far as it will move to take up backlash, zero indicator.
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