Cylinder Head 1.2
DETROIT DIESEL 53
and the other end hooked around, a control tube
6. The cylinder head must be gradually and uniformly
bracket, tighten the bracket bolts to 10-12 lb-ft torque.
drawn down against the gaskets and seals to ensure a
good seal between the cylinder head and the block.
13. After tightening the bolts, revolve the tube and see
Therefore, it is vitally important that the cylinder head
if the return spring pulls the injector racks out (no-fuel
be installed with the utmost care.
position) after they have been moved all the way in
(full-fuel position). Since the injector control tube is
7. Then, begin on the camshaft side of the head to
mounted in self-aligning bearings, tapping the tube
take up the tension in the cam follower springs by
lightly with a soft hammer will remove any bind that
tightening the bolts lightly. Finally tighten the bolts to
exists. The injector racks must return to the no-fuel
170-180 lb-ft torque with a torque wrench, about one-
position freely by aid of the return spring only. Do not
half turn at a time, in the sequence shown in Fig. 6.
bend the return spring to bring about this condition.
Under no circumstances should the torque exceed the
specified limits, otherwise the bolts may become
14. Install the fuel rod and the fuel rod cover (if used).
stretched beyond their elastic limits.
15. Remove the covers from the drain holes in the
8. Cover the oil drain holes in the cylinder head to
head.
prevent foreign objects from falling into the holes.
16. Install the exhaust manifold and connect the
9. If the injectors were not previously installed, refer to
exhaust piping.
Section 2.1 or 2.1.1 and install them at this time.
17. Install the thermostat housing and the thermostat.
10. Tighten the rocker arm bracket bolts to 50-55 lb-ft
torque.
18. Install the air cleaners.
CAUTION: There is a possibility of damaging
19. Connect the fuel lines.
the exhaust valves if the exhaust valve bridge is
20. Fill the cooling system and check for leaks.
not resting on the ends of the exhaust valves
when tightening the rocker arm bracket bolts.
21. With the throttle in the OFF position, crank the
Therefore, note the position of the exhaust
engine over to be sure that all of the parts function
valve bridge before, during and after tighten-
ing the bolts.
freely.
22. Before starting the engine, perform an engine
11. Align the fuel pipes and connect them to the
tune-up as outlined in Section 14.
injectors and the fuel connectors. Use socket J 8932-01
to tighten the connections to 12-15 lb-ft torque.
23. Refer to Section 13.1 and start the engine. After
starting the engine, check all fuel line connections to
CAUTION: Do not bend the fuel pipes and do
ensure that no fuel oil leaks into the cylinder head
not exceed the specified torque. Excessive
compartment to dilute the lubricating oil.
tightening will twist or fracture the flared ends
o f the fuel pipes and result in leaks.
24. After the engine has been warmed up (to at least
Lubricating oil diluted by fuel oil can cause
serious damage to the engine bearings.
25. Recheck the exhaust valve clearance and the
injector timing after the engine reaches normal
12. Set the injector control tube assembly in place on
operating temperature.
the cylinder head and tighten the bolts, finger tight
only. When positioning the injector control tube, be
26. Examine all fuel oil, lubricating oil and water
sure that the ball end of each injector rack control
connections for possible leaks. Tighten the connec-
lever engages the slot in the corresponding injector
tions, if necessary.
control rack. With one end of the control tube return
27. Install the valve rocker cover, using a new gasket.
spring hooked around an injector rack control lever
July, 1970 SEC. 1.2 Page 7
