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 TM 5-685/NAVFAC MO-912
PLOT OF FUEL AND LUBE OIL CONSUMPTION VS. LOAD
0
I
IO
9
8
6
4
3
2
ENGINE NO.
Figure 3-l7. Performance data plots.
(c) "C" on the chart may indicate a develop-
(refer to the troubleshooting table) consult the spe-
ing engine problem.
cific manufacturer's literature for instructions.
c. Overhaul procedure. Engine overhaul requires
(d) "D" on the chart indicates engine gover-
nor positions relative to "A", "B", and "C".
disassembly of the engine. Verify that all engine
b. Engine overhaul. An engine consists of struc-
parts comply with the manufacturer's specifications
tural parts and moving parts. Structural parts are
and tolerances.
those having no movement relative to each other.
(1) Inspect structural parts as follows:
(a) Foundations for deformation and cracks.
They do not involve clearances, adjustments, or lu-
brication. These parts consist of the following: foun-
(b) Bedplate for cracks and distortion; bear-
dation, bedplate, foundation bolts, frames, cylinders
ing supports for good condition.
and block, cylinder heads, covers and associated
(c) Foundation bolts for tightness and gen-
gaskets, and auxiliary housings. Moving parts are
eral good condition including straightness.
those that normally require fitting and/or clearance
(d) Frames for cracks, distortion, and gen-
adjustment. These parts consist of the following:
eral good condition.
crankshaft (including journal surfaces, counter-
(e) Cylinders and cylinder blocks for cracks;
weights, gears, and flywheels), main bearings,
water jacket areas for corrosion, scale, and rust;
thrust bearings, camshafts and bearings, connect-
machined surfaces for smoothness.
(f) Cylinder heads for cracks; water jacket
pins), timing gear mechanisms, and auxiliary or
areas for corrosion, scale, and rust; valve seats for
accessory drives. All of these parts are engineered
cracks; machined surfaces for smoothness.
and designed by the engine manufacturer to per-
(g) Covers and gaskets for distortion and
--
form a particular task. When the need to overhaul
cracks; use satisfactory gaskets only after anneal-
an engine is indicated by operational malfunctions
ing; use new seals and gaskets other than copper.
3-25
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