TM-9-2815-213-34

ENGINE, DIESEL, WITH ACCESSORIES CUMMINS MODEL V8-300 (2815-910-8217)

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL (INCLUDING DIRECT SUPPORT AND GENERAL SUPPORT REPAIR PARTS LIST AND DEPOT MAINTENANCE ALLOWANCES)

FEBRUARY 1972

  TM-9-2815-213-34 - Page 87 of 192

C 1,
TM 9-2815-213-34
(3)
Valve timing marks are located on the
vibration damper at the front of the engine (95).
CAUTION
Check that index marks on outer ring an
hub of vibration damper aline.
If no
replace vibration damper.
(4)
To aline the timing marks rotate engine
manually in a counterclockwise rotation (left-hand as
viewed from flywheel low towards the fan) until one of the
sets of marks
47
is in line with the "A" arrow head on the
front cover.
vs.
In this position,
both intake exhaust
valves will be closed for one of the cylinders indicated.
Make adjustments or cylinder.
(5)
Adjust injector plunger,
then cross] and
valves of each cylinder as explains succeeding
paragraphs.
Turn crankshaft wise to the next VS mark
corresponding to order of the engine which is 1-5-4-8-6-
3-7-2 figure 3-96 for complete sequence of adjusts
(6)
After injectors,
crossheads and v are
adjusted for this cylinder,
rotate crankshaft in direction of
rotation (right-hand the next VS mark corresponding to
the order of the engine and repeat the adjust
procedures.
NOTE
Two complete revolutions (720 degrees)
the crankshaft are needed to set all
injector plungers,
crossheads and
valve: Injectors,
crossheads and valves
can E adjusted for only one cylinder at
any or VS setting.
b. Injector Plungers.
(1)
Turn adjusting screw down until plunger just
contacts cup,
then advance an addition degrees to
squeeze oil from cup.
(2)
Loosen adjusting screw one turn.
(3)
With a torque wrench calibrated in pounds
and a screwdriver adapter,
tighter adjusting screw for a
cold setting (70 de Fahrenheit) at 50 inch-pounds torque.
setting 140 degrees Fahrenheit 50 inch-pounds.
c. Valve Crossheads.
(1)
Loosen valve crosshead adjusting locknut
and back off screw one turn.
(2)
Use light finger pressure at "A" to
crosshead in contact with valve stem at point “B” (fig 3-
97).
(3)
Turn adjusting screw down until contacts its
mating valve stem at point "C' (fig.
3-97).
(4)
Advance adjusting screw slightly,
then
loosen.
Retighten adjusting screw until valve contact is
made.
(5)
Tighten 7/16 inch high locknut 60 to 70 foot-
pounds torque.
(6)
Check clearance between crosshead and
valve spring retainer with a wire gage.
There must be a
minimum of 0.025 inch clearance at this point.
d. Value Clearance.
NOTE
The same engine position used in
setting the injectors is used for setting
the intake and exhaust valves.
(1)
Loosen the locknut and back-off the
adjusting screw.
Insert feeler gage between rocker lever
and top of crosshead; turn screw down until lever just
touches the gage.
Lock adjusting screw in position with
locknut.
(2)
Always make final valve adjustment after
injectors and crossheads are adjusted and with the
engine
at
operating
temperature
(140
degrees
Fahrenheit).
Valve clearances are as follows: Intake
Valves: 0.016 inch at 70 degrees Fahrenheit,
0.014 inch
at 140 degrees Fahrenheit.
Exhaust Valves: 0.029 inch
at 70 degrees Fahrenheit,
0.027 inch at 140 degrees
Fahrenheit.
(3)
Position valve covers to heads with new
gaskets.
Secure with flatwashers,
lockwashers,
and
cap screws.
3-168.
Starting and Testing
Engine break-in and testing are accomplished together.
Break-in on a new or rebuilt engine is
Figure 3-95.
Valve timing marks.
3-58


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