Page 308
REPAIR INSTRUCTIONS
REBUILT ENGINE RUN-IN
PROCEDURES
General Instructions
The durability and service life of a rebuilt engine
is directly related to its initial run-in following
overhaul. After a complete overhaul or any major
repair job involving installation of piston rings,
pistons, cylinder sleeves or bearings, the engine
must be run-in prior to release for service.
Run-in procedures vary depending on method
used (i.e., engine dynamometer, chassis
dynamometer or highway run-in). Regardless of
method, however, always properly prepare the
engine before starting it for the first time.
Run-In Check
Install any additional instrumentation needed for
the run-in method selected.
The operator should be familiar with the correct,
established procedure for checking chassis
power
before
using chassis dynamometer
method for run-in (refer to applicable chassis
dynamometer operation procedures).
The operator must be observant throughout the
entire run-in procedure, in order to detect any
problems that develop. Constantly monitor the
instrumentation displaying functions of the engine
and support systems, and record all readings.
If, during run-in, the engine develops any of the
following abnormal running characteristics, shut it
down immediately. Investigate and correct the
problem before continuing the run-in procedure.
Always investigate the following conditions:
r Unusual noises such as knocking, scraping,
etc.
r A significant drop in engine oil pressure
r A significant rise in coolant temperature,
exceeding 240
°
F (116
°
C)
r A significant rise in oil temperature that
exceeds 240
°
F (116
°
C)
r An exhaust temperature that exceeds
maximum acceptable limits for the specific
engine involved, as measured by a
pyrometer (if applicable)
r Any oil, coolant or air inlet system leaks
CYLINDER HEAD RETORQUING
After run-in procedure, in sequence, back off
each cylinder head capscrew individually until
free. Then retorque same capscrew to 205 lb-ft
(278 N•m).
5_106_00.bk Page 308 Friday, August 4, 2000 11:17 AM
BDC for engine manuals and specs
https://barringtondieselclub.co.za/
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