Abnormal Engine Blowby?
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5th Wheeling
Joined: Apr 2021
Posts: 33
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Abnormal Engine Blowby?
I’m starting to think this project is a bit beyond my capabilities and time availability. This engine blowby seems like a lot and didn’t really go away after I let it idle for about 10 minutes. What are your thoughts?
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5th Wheeling
Joined: Apr 2021
Posts: 33
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there was quite a bit from opening the oil cap and the vent was accumulating thick oil inside.
I cracked each injector cap and every time the engine had a really good “bog down” response, but this blowby still just seems like so much!
I cracked each injector cap and every time the engine had a really good “bog down” response, but this blowby still just seems like so much!
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5th Wheeling
Joined: Apr 2021
Posts: 33
Likes: 5
there was quite a bit from opening the oil cap and the vent was accumulating thick oil inside.
I cracked each injector cap and every time the engine had a really good “bog down” response, but this blowby still just seems like so much!
I cracked each injector cap and every time the engine had a really good “bog down” response, but this blowby still just seems like so much!
Mountain Pass
Joined: Apr 2020
Posts: 189
Likes: 25
That looks better than mine.
These trucks apparently always had a lot of blow-by. Some of the more senior members (pun intended), those who were adults when these truck were new, seem to indicate that the level of blow-by you see is normal. My truck and I have similar born-on dates.
I would say that if you don't have crazy oil consumption, don't worry. Check to see if your CDR is full of oil, indicating blow-by is pushing/carrying oil into your intake (that does not mean you need a new CDR, best not to go down that road).
If you have blow-by/oil consumption and want to try to slow it down, you can do any one or a combination of the following:
These trucks apparently always had a lot of blow-by. Some of the more senior members (pun intended), those who were adults when these truck were new, seem to indicate that the level of blow-by you see is normal. My truck and I have similar born-on dates.
I would say that if you don't have crazy oil consumption, don't worry. Check to see if your CDR is full of oil, indicating blow-by is pushing/carrying oil into your intake (that does not mean you need a new CDR, best not to go down that road).
If you have blow-by/oil consumption and want to try to slow it down, you can do any one or a combination of the following:
- Rebuild the engine
- Flush the engine and hope to free up rings (BG EPR/109 seems to be the real deal)
- Use engine restore
- Install a RDT
- Drive it as if nothing is wrong
Last edited by PossumTruck; Apr 21, 2021 at 01:30 PM.
Elder User
Joined: May 2018
Posts: 695
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Since most blowby is routed through the always open CDR, you have no idea how much blowby you really have at the oil fill tube unless you first block off the CDR valve.
That's the worst thing you can do plus it has no effect on stuck piston rings.
Second worst thing you can do.
Flush the engine and hope to free up rings (BG EPR/109 seems to be the real deal)
Install a RDT
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Fleet Mechanic
Joined: Sep 2016
Posts: 1,519
Likes: 224
From: Nevada
5. Drive it as if nothing is wrong.
Blow By and CDR and RDT constantly come up.
All engines have some Blow By, more as they age, (mileage wise)
The CDR routs the BB into the intake to be burned instead of sending
into the atmosphere.
A lot of people dump crap into their fuel tanks, but worry about BB.
Interesting.
Charlie
Blow By and CDR and RDT constantly come up.
All engines have some Blow By, more as they age, (mileage wise)
The CDR routs the BB into the intake to be burned instead of sending
into the atmosphere.
A lot of people dump crap into their fuel tanks, but worry about BB.
Interesting.
Charlie
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Mountain Pass
Joined: Apr 2020
Posts: 189
Likes: 25
Just slightly less worser, as Greta Thunburg will come and pour engine flush into your oil-fill neck, while giving you the "How DARE YOU?" stare.
Also, because sarcasm rarely comes across correctly on the internet, Ray's advice is sound. Do your research and calculate your risk/reward. I like the do-nothing camp if you aren't drinking huge amounts of oil, and possibly even if you are. As other have alluded, a new CDR wont fix that. It remains a mystery to me the mechanics of how a RDT "eliminates" oil consumption, but anecdotes abound. I have theories but I fear Greta.
Mountain Pass
Joined: Apr 2020
Posts: 189
Likes: 25
Those actions are unlikely to hurt anything, and many reports exist of IDI folks using lucas without catastrophe. So I wouldn't hesitate to try. I ran it in my engine once and the engine continues to roll on. Many advocates for and detractors from Lucas. BITOG is a good place to research that stuff.
Fleet Mechanic
Joined: Sep 2016
Posts: 1,519
Likes: 224
From: Nevada
I was thinking, than damn CDR again?
Charlie
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