Service Manual

Crankcase Blowby, Measure ISB, ISBe and QSB (Common Rail [...]
Page 14-32 Section 14 - Engine Testing - Group 14
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If internal engine damage is suspected to be the cause of
the excessive blowby condition, other steps can be taken
to confirm this. The steps include:
• Confirm engine maintenance practices
• Cut the oil filter open and check for debris
• Take an oil sample and inspect for contamination.