bad blow-by
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bad blow-by
The smoke coming out of my heater turned out to be excessive blow-by (out of the breather cap and even the dipstick tube) being sucked in. The PVC valve rattles and has flow only in the proper direction and I seem to have sufficient vacuum at the manifold, and can't find any blockage. If this blow-by is a recent development (oh woe is me), why aren't I laying down a smoke screen out of the tailpipe? BTW, it's the 'Mileage Maker" I6 (223). Thanks for the help even if it's bad news.
Lon
Lon
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
The smoke coming out of my heater turned out to be excessive blow-by (out of the breather cap and even the dipstick tube) being sucked in. The PVC valve rattles and has flow only in the proper direction and I seem to have sufficient vacuum at the manifold, and can't find any blockage. If this blow-by is a recent development (oh woe is me), why aren't I laying down a smoke screen out of the tailpipe? BTW, it's the 'Mileage Maker" I6 (223). Thanks for the help even if it's bad news.Lon
Inside that adapter is a filter screen (B2TZ6A631A).
Since next to no one today knows there's a filter back there, it rarely gets changed, and so...it's prolly clogged up.
If it's not the filter, the rings are shot. Blow-by with the 223 engine was/is somewhat common...even when these trucks had only 40,000 or so miles on them.
btw: The 223's & 292's used the same filter with a road draft tube...or with the adapter.
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Junior User
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blow-by
Boy, there is no joy in Mudville. I pulled the adapter after I checked the PCV valve and the screen is absent. I'm probably just trying to avoid the obvious. I chewed up a ring and piston about a year and a half ago in #5. Since we were already into our little 'recession' I preferred to leave the cash stashed in the mattress and went with a minimal repair route. The kids in AutoMech at the Jr. College I work at did it for the cost of parts. The instructor thought the wall scarring was minimal enough that without boring I'd be able to get away with just a little oil use, which was the case until just a few days ago. Thanks for the input, guys.
Lon
Lon
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From: Faibanks Ak.
When the PCV system is present, there is an adapter at the rear of the engine that takes the place of the road draft tube.
Inside that adapter is a filter screen (B2TZ6A631A).
Since next to no one today knows there's a filter back there, it rarely gets changed, and so...it's prolly clogged up.
If it's not the filter, the rings are shot. Blow-by with the 223 engine was/is somewhat common...even when these trucks had only 40,000 or so miles on them.
btw: The 223's & 292's used the same filter with a road draft tube...or with the adapter.
Inside that adapter is a filter screen (B2TZ6A631A).
Since next to no one today knows there's a filter back there, it rarely gets changed, and so...it's prolly clogged up.
If it's not the filter, the rings are shot. Blow-by with the 223 engine was/is somewhat common...even when these trucks had only 40,000 or so miles on them.
btw: The 223's & 292's used the same filter with a road draft tube...or with the adapter.
Then I got one a couple years that said there was never a dimmer switch on the floor so she would not waste her time looking it up.
I just wanted to thank you for the info you give out and for your time,I have a feeling you were in the small percentage of the great partsmen.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
I have dealt with partsmen and women all my life and there are partsmen that do a good job then there are PARTSMEN that you could tell them what part you need and they grab it off the shelf with out looking at a book or later a computer.
Then I got one a couple years that said there was never a dimmer switch on the floor so she would not waste her time looking it up.
Then I got one a couple years that said there was never a dimmer switch on the floor so she would not waste her time looking it up.
COTZ13A024A .. Dimmer Switch - Foot Operated (Motorcraft SW263) / Fits a gazillion car/truck applications 1960/96.
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Elder User
Joined: May 2005
Posts: 581
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From: Montana
my 2 cents, blowby is also commonly caused by worn valves releasing gases into the valve cover area. it gets especially worse when the valve rubbers are old and broken. i agree with the rest of the fellers, do a compression test. also a trick i learned a few years back. take a old sparkplug break out all the glass liner so all you have is the threaded nut part and weld a hose connection onto it so you can pressure the cylindars. you can then pressure up your cylidars with an aircompresser . if you hear air weasing into the valve cover ares it the valves that are bad, if it's coming out the tailpipe then its rings. it has made a big difference in my choices of whether i have to work on the top end or the bottom section. this willl also help in telling you whether it is exhaust valves or intake valves. Dutch
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Postmaster
Joined: Jul 2003
Posts: 2,688
Likes: 4
From: Southern Oregon
When the PCV system is present, there is an adapter at the rear of the engine that takes the place of the road draft tube.
Inside that adapter is a filter screen (B2TZ6A631A).
Since next to no one today knows there's a filter back there, it rarely gets changed, and so...it's prolly clogged up.
If it's not the filter, the rings are shot. Blow-by with the 223 engine was/is somewhat common...even when these trucks had only 40,000 or so miles on them.
btw: The 223's & 292's used the same filter with a road draft tube...or with the adapter.
Inside that adapter is a filter screen (B2TZ6A631A).
Since next to no one today knows there's a filter back there, it rarely gets changed, and so...it's prolly clogged up.
If it's not the filter, the rings are shot. Blow-by with the 223 engine was/is somewhat common...even when these trucks had only 40,000 or so miles on them.
btw: The 223's & 292's used the same filter with a road draft tube...or with the adapter.
Postmaster
Joined: Jul 2003
Posts: 2,688
Likes: 4
From: Southern Oregon
Here is a pic of the PCV system components and the too large filter:
It would be nice to find a filter that fit, but I havent seen one in 7 or more pans that I've had. Check your metal line, it is probably clogged.
It would be nice to find a filter that fit, but I havent seen one in 7 or more pans that I've had. Check your metal line, it is probably clogged.
New User
Joined: Jan 2010
Posts: 14
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Compression test her, pour some oil into the cylinders showing low, retest. Increase in compression piston/rings related. No increase in compression head/valves related. Just something i have always done and just corectly diagnosed a ring problem in my Fury's 383 motor.Thought you might be interested.G
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