SERVICE MANUAL
INTRODUCTION
Introduction
PROBLEM ANALYSIS GUIDE
PROBLEM: LOW INTAKE MANIFOLD PRESSURE (POWER COMPLAINT)
REASON OR CAUSE:
1.
Operator error...
a.
gauge inaccurate
b.
engine not properly loaded
2.
External leakage...
a.
on intake or exhaust manifolds at gasket
b.
at air compressor and turbocharger mounting and housing clamps
c.
at the diaphragm or pressure feed line of the aneroid
3.
Excessive...
a.
air cleaner restriction
b.
exhaust back pressure after turbocharger.
4.
Incorrect...
a.
engine valve timing
b.
injection pump timing
c.
high idle adjustment (too low)
d.
linkage adjustment
e.
valve adjustment (too tight)
f.
injection pump on engine
g.
turbine housing A/R ratio or nozzle ring
h.
lift to port closure (start of injection)
5.
Plugged...
a.
or defective injection nozzles
b.
or restricted fuel filters
c.
or loose fuel bleed valve
CGES-185-3
PRINTED IN UNITED STATES OF AMERICA
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