Service Manual

Crankcase Blowby, Measure ISB, ISBe and QSB (Common Rail [...]
Page 14-42 Section 14 - Engine Testing - Group 14
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WARNING
To reduce the possibility of personal injury, keep
hands, long hair, jewelry, and loose fitting or torn
clothing away from fans and other moving parts.
WARNING
Troubleshooting presents the risk of equipment
damage, personal injury, or death. Troubleshooting
must be performed by trained, experienced
technicians.
CAUTION
Do not operate the engine with valve (A) open and
valve (B) closed for more than 1 minute. Monitor the
amount of oil accumulating in the bucket. The engine
can run out of lubricating engine oil and severe
engine damage will occur.
Continue operating at rated speed and load.
Open valve (A) and close valve (B).
Record the blowby pressure reading.
CAUTION
Do not operate the engine for more than 1 minute.
Monitor the amount of oil accumulating in the
container. The engine can be run out of lubricating
engine oil and severe engine damage will result.
Alternate Turbocharger Isolation Method:
With the turbocharger oil drain line disconnected from the
cylinder block, run the turbocharger drain line into a large
container.
Plug the turbocharger oil drain port in the cylinder block.
Operate the engine at rated speed and under load by
either:
• For engine testing, a chassis dynamometer or engine
dynamometer
• A stall speed test (for engines equipped with automatic
transmissions only).
Record the peak blowby pressure measurement.