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 301 of 894
ENGINE
TRUCK SERVICE MANUAL
Definition of "Cold Set"
Engine must have reached a stabilized temperature (oil
temperature to be within 10 deg. F of ambient air
temperature).
Definition of "Hot Set"
1.
Set injectors and valves immediately after the engine
has reached normal stabilized operating oil temperature.
2.
If oil temperature gauge is unavailable, set injectors
and valves immediately after engine has operated at
rated speed and load or at high idle for a period of 20
minutes.
Injector And Valve Adjustment Using ST-1270 Dial
Indicator Method NH-NT Series
This method involves adjusting injector plunger travel
with an accurate dial indicator rather than tightening the
adjusting screw to a specified torque.
A check can be
made of the adjustment without disturbing the locknut or
screw setting.
The valves can also be checked or set
while adjusting the injectors by this method.
See Table
2-11.
When engine has been set in proper position for injector
to be adjusted, tighten adjusting screw until all lash is
removed from injector train.
Then tighten adjusting
screw one additional turn to properly seat links and to
squeeze oil from socket surfaces.
Back adjusting screw
off until spring washer contacts stop.
Now adjust zero
clearance, use 3375232 Torque Wrench and tighten
screw to 5 to 6 inch-lbs [0.56 to 0.68 N.
m] torque.
Zero
clearance being defined as the condition where the link is
slightly loaded.
Note:
If torque wrench is not available, zero clearance
can be set at point approximately where link is slightly
loaded, but just free enough to be rotated by thumb and
forefinger.
Hold adjusting screw with screwdriver and tighten locknut
to proper torque.
Note:
If injectors were removed for cleaning or
replacement tighten injector, hold-down capscrews In
alternate steps' to 10 to 12 ft-lb [14 to 16 N•m J torque.
Table 2-11: Injector and Valve Set Position
Bar in
Pulley
Set Cylinder
Direction
Position
Injector
Valve
Start
A or 1-6VS
3
5
Adv To
B or 2-5 VS
6
3
Adv To
C or 3-4 VS
2
6
Adv To
A or 1-6 VS
4
2
Adv To
B or 2-5 VS
1
4
Adv To
C or 3-4 VS
5
1
Injector And Valve Adjustment
Note:
Injectors and valves may be adjusted without
removal of the Jacobs Brake by using 3375096 Jacobs
Brake Kit.
This kit includes a special rocker lever
actuator, dial indicator extension, feeler gauge and
special offset wrenches.
See Table 2-12 for adjustment with cast iron or
aluminum rocker housings.
1.
Bar engine until A or "1-6 VS" is aligned with pointer.
Fig.
2-50.
Both valve rocker levers for No.
5 cylinder
should be free (valves closed).
Injector plunger for No.
3 cylinder must be at top of travel.
If not, check No.
2
cylinder for valves being free and No.
4 injector plunger
should be at top of travel.
See Table 2-11 for Valve
Injector Set Position.
Fig. 2-50, (Nl14230) Accessory drive pulley markings
2.
Install ST-1270 to rocker housing with indicator
extension on top of injector plunger for cylinder as
determined in Step 1 above.
See Fig.
2-51.
3.
Screw injector lever adjusting screw down until
plunger is bottomed in cup, back off approximately 1/2
turn then bottom again, set dial indicator at zero (0).
Note:
Care must be taken to assure injector plunger is
correctly
bottomed
in
cup,
without
overtightening
adjusting screw, before setting dial indicator.
4.
Back adjusting screw out until a reading of 0.170
inch [4.32 mm] or 0.175 inch [4.45 mm] , reference Table
2-12, is obtained on dial indicator.
Snug tighten locknut.
5.
Using ST-1193 Rocker Lever Actuator, bottom
injector plunger, check zero (0) setting.
Fig.
2-51.
Allow
plunger to rise slowly, indicator must show plunger travel
to be within range specified in Table 2-12.
6.
Using ST-669 Torque Wrench Adapter to hold
adjusting screw in position, torque locknut 30 to 35 ft-lb
[41 to 47 No mi.
If torque wrench adapter is not used,
hold adjusting screw with a screwdriver, torque locknuts
40 to 45 ft-lb [54
to 61 No mi.
297
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