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OM 2012
(7)
Rc;:I;aat si-ops (2)
tlil-CtXJ!l
(6) for each cylin&r.
E.
Causes of tow Cylinder
Pressure
Low cylinder
presr.uras may result
from any one of several
fauSCs:
(1)
Pistcxl r ings may b2
:tuck
or broken .
To determine
the conditial
of thz
rings,
remove t!m air bsx
cover
end press a7 the compressi-,:;
rings with
a blunt tool.
A broken or stuck ring will
net have a spring-like
acticn.
(2)
Compression
pressure may 'be leaking
past i-he cylinder
head gasket,
valves
and valve seals,
injector
tube,
or through
a hole in the piston.
To aorrzct
any of these ccnditians,
consult
your Detroit
Diesel
Srvice
Outle?.
.
F..
Fue I Flow,Test
(see Fig.
7)
Cljeck fue I pump and fuel flow as foiiows:
(1)
Disconnect
the fuel return
tuto
at,
or near,
the tank.
Hold the open end
over,
or in, a
convenient
container
of over 1 -gal Ian
capccity
.
(2)
Start
and run the engine at governed
speed 2000
RPM.
Measure
the fuel
flow from the return
tube for
1 minute.
Flow should
be 0.8
galfon
(based
or? O-.080 restriction).
If fuel flow
is be low this amount,
it indicates
that
the fuel strainer,
fuel filter
or fue I pump requires
servicing
or repair.
(3)
To
chacksuction
side of the pump,
immerse the end of the return
tube in
a ccntainer
of fuel.
if air bubbles rise to the surface
of the fuel,
it indi-
cates that air is being drawn
into the fuel sy:tem
on the suction
side of the
pump.
If air is present,
tighten
all fuel connections
between
the fuel tank
and the fuel pump.
Check for defective
t&s,
hoses, etc.
10.
Illustrations
Illustrations,
Figures
1 through
8, arc referred
to throughout
the Trouble
Shooting
Chart,
Figure
9.
3-l
Page 6
4
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