If a sudden increase in blowby occurs, or if blowby ex-
ceeds the maximum allowable limit during any run-in,
return to the previous step and continue the run-in. If
blowby does not reach an acceptable level during the
next step, discontinue the run-in and determine the cause.
Do not proceed to the next step until a steady, acceptable
blowby reading is obtained.
NOTE: Blowby must be measured by using Service Tool,
Part No. 3375150 or 3822566 with manometer, Part No.
ST-1111-3, or equivalent. Service Tool, Part No. 3375150,
as shown, utilizes a chamfered 7.67 mm [0.302 in] orifice.
Move the throttle to obtain 1200 RPM engine speed, and
apply a test load sufficient to develop 25 percent rated
fuel pressure or 25 percent fuel rate on CELECT™ en-
gines.
Operate the engine at this speed and load level until the
coolant temperature reaches 71°C [160°F].
Check all gauges and record the data.
Operate the engine at maximum horsepower RPM and 75
percent of rated fuel pressure or 75 percent fuel rate on
CELECT™ engines for 3 minutes. Check the gauges, and
record the readings.
NOTE: Do not proceed to the next step until a steady,
acceptable blowby reading is obtained.
Operate the engine at maximum horsepower RPM and
Advertised Horsepower with a wide open throttle, for 5
minutes. Check the gauges, and record the readings.
Engine Testing Engine Run-In Procedure - Chassis Dynamometer (8-07)
N14 Page 8-51
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