MAINTENANCE OF THE M88A1 - OD1672 - LESSON 2/TASK 1
(1) Troubleshooting.
With the engine not running, open the rear
exhaust doors (13, 14, and 15) (refer to figure 9 on page 28), and look at
the engine deck liner for wet spots. For the purpose of this task, it is
assumed that wet spots can be seen on the engine deck liner.
It is
therefore evident that fuel is leaking from somewhere within the engine
compartment and this leak must be located.
The first two steps in the
procedure for locating the leak require the removal of the engine deck and
the front and rear cooling fans. For the purpose of this procedure, it will
be assumed that both the engine deck and cooling fans have been removed.
Upon the removal of the engine deck and fans, it is evident that fuel is
leaking from somewhere beneath the engine upper covers and within the engine
compartment.
The following maintenance, adjustment, and repair procedure,
describes only the steps involved in determining the cause of this leakage
and the repair of defective items contributing to the defect.
(2) Maintenance, Adjustment, and Repair.
Step 1. After the engine deck and cooling fans have been removed, remove
the engine right and left upper covers (figure 22, views A and B, on the
following page, and figure 23, views C and D, on page 49) to gain access to
the fuel lines and fittings. Upon removal of the engine covers, inspect the
fuel lines and fittings leading to and from the injectors for cracks, kinks,
twists, or flattened areas.
It is assumed that this inspection revealed
that some of the fuel supply line fittings connected to the injectors and
the hydraulic head of the fuel injector pump are leaking.
The following
steps, therefore, describe the repair of this defect.
Step 2.
Using a 11/16 open end wrench, tighten the fuel supply line nut
(figure 24, view A, on page 50) at the hydraulic head of the fuel injector
pump to a point where the sleeve seats itself in the fitting.
When the
sleeve is seated, draw the nut up approximately 1/6 (minimum) to 1/3
(maximum) of a turn more to complete the tightening operation.
When tightening the fuel supply lines, be careful not to overtighten the
coupling nuts at either end of the fuel lines.
To remedy a fuel leak,
loosen and retighten the coupling nut; this operation
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