Blow by

1991 ISUZU KB280
180,000 MILES • 2.5L • 4 CYL • 4WD • MANUAL
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JUSTIN AQUILINA
  • MEMBER
  • 9 POSTS
Hi,

I would like to know if it is normal to have an engine with blow by? It does not consume any oil.
Apr 5, 2019 at 11:53 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning,

Blow by is normal. Your PCV system is what controls the crankcase pressure from compression passing the rings.

Excessive amounts is not right if the PCV system is clogged or the piston rings are worn out.

Roy
Apr 6, 2019 at 12:08 AM
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JUSTIN AQUILINA
  • MEMBER
  • 9 POSTS
Thanks for your reply. Is it normal to have this blow by? Engine runs normally and fine without any oil consumption etc.
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Apr 6, 2019 at 2:27 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
That is not bad.

Clean out the PCV system.

Roy
Apr 6, 2019 at 2:33 AM
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JUSTIN AQUILINA
  • MEMBER
  • 9 POSTS
Okay. Thanks Roy for your feedback.
Apr 6, 2019 at 2:38 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
You're welcome.

Always glad to help.

Roy
Apr 6, 2019 at 3:21 AM
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