Causes of excess blowby

[Badger]

cm870-
ive had this truck since 850k miles, now has 1.4mil .
Has had 2 set of pistons/liners put in since i bought it, and it has always had quite a bit of blowby. can a wore out air compressor create blowby ? i dont even pay attention to it anymore but after holding the steering wheel all day today i just started thinking about it...

and i made one of them test tube things like in the manual for checking blowby pressure, and mine was always worse than they say is "acceptable"

[hhow55]

In quickserve you will find in sympton search under High Blowby info that should be of help.

[Signature620]

Air compressor, turbo, valve stem seals or cylinder issues are all possible causes.

[Rawze]

(10-05-2022 )Badger Wrote:  cm870-
ive had this truck since 850k miles, now has 1.4mil .
Has had 2 set of pistons/liners put in since i bought it
...

What I would like to know is why it has had 2 sets of pistons and liners in only 550k miles?. Something does not sound right at all if that is the case.. and was all OEM parts used?// was a new head used?... were the liners raised to 0.015"?... and did anyone double-ensure that the rings were all set correctly (180-degrees away from each other properly) as the pistons went in?..


those are the things that come to mind when I read your post.

[Bengy88]

What the guys above said.... and does this truck happen to have a hot file in it?