Excessive Blow-by?
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4th Gear
Joined: May 2022
Posts: 4
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From: Virginia
Excessive Blow-by?
I'm scared to post this for fear of the worst, but could yall let me know whether or not this would be considered "excessive blow-by"? I did the "oil cap test", and it does fine, but the amount of smoke I find concerning. 1999 Ford F-250 Super Duty 7.3L 4x4 w/ 270xxx miles https://youtube.com/shorts/oxnW0XlIjJI?feature=share
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
Is there any pressure behind it?
This is your video for those wanting it to be seen on the screen instead of copy/pasting the link
https://youtube.com/shorts/oxnW0XlIjJI?feature=share
This is mine with bad blow by,
https://youtube.com/shorts/CmaU-eX6C5w?feature=share
This is your video for those wanting it to be seen on the screen instead of copy/pasting the link
https://youtube.com/shorts/oxnW0XlIjJI?feature=share
This is mine with bad blow by,
https://youtube.com/shorts/CmaU-eX6C5w?feature=share
Hotshot
Joined: Dec 2012
Posts: 11,278
Likes: 1,658
From: Las Cruces New Mexico
It's a Van Gogh
Joined: Feb 2010
Posts: 7,813
Likes: 1,335
From: Elk Grove, CA
Imo OP's vid the blowby is nothing to worry about.
Confirm with a compression test if ya really want, but as a diagnostic tool I call that good. Move on to the next level of diagnosis.
Confirm with a compression test if ya really want, but as a diagnostic tool I call that good. Move on to the next level of diagnosis.
Banned
Joined: Dec 2018
Posts: 3,541
Likes: 458
Seen worse. Lumpy/uneven cranking with the starter is another clue one cylinder is has lost compression for some reason, but it could also just be all 8 of them are losing a little more that ideal past the rings and nothing is "broken". You'll notice on a cold engine there is almost no blow-by gasses. The thicker oil room-temp oil seals it up better. At full operating temp you will see the most blow-by. Buddy of mine bought a 6.0 with a completely blown cylinder and there was a ton of blue smoke out of the tailpipe, dip stick would come shooting out of the tube under high boost, and taking the oil cap off it looked like a steam locomotive. Used a lot of oil and had a huge dead skip in the starter. If yours doesn't use oil excessively I wouldn't worry about it.
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