blow by
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blow by
i happend to see that blow by was something to look at when buying a truck in another thred ..... my truck has some BLOW BY! like a good steady steam coming from the hose on top of the valve cover that leads to my intake .... i just took it off today and pointed it toward the back of the moter ... ha ha what does this meen?
Postmaster
Joined: Jun 2007
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From: Sweetwater Texas
Mines gotta good bit of blow by, but hardly uses any oil.
That 22.5 to 1 compression is what gets ya, it doesn't take hardly any gap at all with that kind of pressure to get a little compression in your crankcase.
That 22.5 to 1 compression is what gets ya, it doesn't take hardly any gap at all with that kind of pressure to get a little compression in your crankcase.
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From: Sweetwater Texas
ooh I just remembered, have you serviced your CDR? Its whole job in life is to relieve the pressure out of the crankcase, so it may be real dirty, thus not letting the pressure out, thus causing some of your blowby.
Lead Driver
Joined: Nov 2003
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From: Campbell River, B.C.
Before you start worrying about blow by, look at this:
YouTube - 1985 Ford 6.9 IDI Blow By Take Two
That video shows normal blowby at the filler cap and thats nothing to worry about. If you can feel actual pressure under there while the breather system is hooked up, then you might have a problem. One of the old school ways to check for how much is too much is to leave the filler cap in place but not turned to the lock. If the blowby pushes it up, then its too much.
YouTube - 1985 Ford 6.9 IDI Blow By Take Two
That video shows normal blowby at the filler cap and thats nothing to worry about. If you can feel actual pressure under there while the breather system is hooked up, then you might have a problem. One of the old school ways to check for how much is too much is to leave the filler cap in place but not turned to the lock. If the blowby pushes it up, then its too much.
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Senior User
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Before you start worrying about blow by, look at this:
YouTube - 1985 Ford 6.9 IDI Blow By Take Two
That video shows normal blowby at the filler cap and thats nothing to worry about. If you can feel actual pressure under there while the breather system is hooked up, then you might have a problem. One of the old school ways to check for how much is too much is to leave the filler cap in place but not turned to the lock. If the blowby pushes it up, then its too much.
YouTube - 1985 Ford 6.9 IDI Blow By Take Two
That video shows normal blowby at the filler cap and thats nothing to worry about. If you can feel actual pressure under there while the breather system is hooked up, then you might have a problem. One of the old school ways to check for how much is too much is to leave the filler cap in place but not turned to the lock. If the blowby pushes it up, then its too much.
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From: Faibanks Ak.
The cdr is what your hose your talking about is hooked to. You can clean it soak it in gas and swish it around do not use compressed air as it will ruin it.
You will have some noise out of your oil filler cap as the gaers are noisy that is the only reasons most gassers had a timing chain instead.
You will have some noise out of your oil filler cap as the gaers are noisy that is the only reasons most gassers had a timing chain instead.
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The cdr is what your hose your talking about is hooked to. You can clean it soak it in gas and swish it around do not use compressed air as it will ruin it.
You will have some noise out of your oil filler cap as the gaers are noisy that is the only reasons most gassers had a timing chain instead.
You will have some noise out of your oil filler cap as the gaers are noisy that is the only reasons most gassers had a timing chain instead.
Lead Driver
Joined: Nov 2003
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From: Campbell River, B.C.
All you can do with the CDR to make sure its working (after the mentioned cleaning) is inspect it and make sure the rubber diaphragm isn't falling apart.....or just replace it with a new one.
The vapors will come out of the valve cover with more speed because the opening is smaller. Again, thats probably not much to worry about. If you look closer at that video I posted, you will see that the vapors get pulled back in if the engine is revved up a little. If yours does that, then its normal.
There will be high pitched noise comming out of the filler cap from the timing gears, not really loud but enough to notice. I suspect what you are hearing there is also normal.
The vapors will come out of the valve cover with more speed because the opening is smaller. Again, thats probably not much to worry about. If you look closer at that video I posted, you will see that the vapors get pulled back in if the engine is revved up a little. If yours does that, then its normal.
There will be high pitched noise comming out of the filler cap from the timing gears, not really loud but enough to notice. I suspect what you are hearing there is also normal.
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if there is no oil on the fly wheel and clutch is there a chance that it could be my main seal? or maybe just pan i have not had the chance to get underneath it with a wrench yet to see if maybe the pan is loose at the rear or maybe its just the gasket i cant remember can you pull this pan without pulling the moter ?
Lead Driver
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From: Campbell River, B.C.
Any leak on the top or rear of the motor can and likely will drain down the back of the engine to the access cover of the transmission. If your CDR grommit in the valley pan of the engine isn't sealing perfectly, that can already send oil down the back of the engine during idle conditions.
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