Engine Rebuild Guide, Break-In and Tune-Up
02
010
22
DPSG,OUO1004,921 –19–07NOV00–1/1
Preliminary Engine Testing Before Tune-Up
Before tuning-up an engine, determine if a tune-up will
restore operating efficiency. If in doubt, the following
preliminary tests will help determine if the engine can be
tuned-up. Choose from the following procedures only
those necessary to restore the unit.
1. After engine has stopped for several hours, loosen
crankcase drain plug and watch for any water to seep
out. A few drops could be due to condensation, but
any more than this would indicate problems which
require engine repairs rather than just a tune-up.
2. With engine stopped, inspect engine coolant for oil film.
With engine running, inspect coolant for air bubbles.
Either condition would indicate problems which require
engine repairs rather than just a tune-up.
3. Perform a dynamometer test and record power output.
(See DYNAMOMETER TEST in Section 04, Group
150.) Repeat dynamometer test after tune-up.
Compare power output before and after tune-up.
CTM100 (06APR04)
02-010-22
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=70
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