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Old 07-21-2019, 10:21 AM   #1
AnthonyG
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Default Smoke from oil cap?

Been having a great season w my 35 w an 8BA until now. I was almost home after an hour ride & thought Id wind it up a bit up the hill to my house. Immediately following noticed a bit of smoke from engine compartment. Pulled in the drive & further inspection showed some smoke coming from oil cap? None from exhaust. Starts fine runs fine. I do have a PCV connected from rear crankcase vent tube to manifold vacuum. Any thoughts?
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Old 07-21-2019, 10:33 AM   #2
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Default Re: Smoke from oil cap?

shouldn't the pcv valve be installed where the draft tube used to be?
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Old 07-21-2019, 10:54 AM   #3
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Default Re: Smoke from oil cap?

Is the PCP valve ball free, i.e. can you hear it rattle if shaken? Maybe it is full of oil or crud.


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Old 07-21-2019, 11:00 AM   #4
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Default Re: Smoke from oil cap?

Probably calling it out wrong. If the draft tube is here I’m calling it a crankcase vent.IMG_2430.PNG
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Old 07-21-2019, 11:17 AM   #5
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Default Re: Smoke from oil cap?

Photos please.
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Old 07-21-2019, 12:56 PM   #6
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Default Re: Smoke from oil cap?

Quote:
Originally Posted by AnthonyG View Post
Been having a great season w my 35 w an 8BA until now. I was almost home after an hour ride & thought Id wind it up a bit up the hill to my house. Immediately following noticed a bit of smoke from engine compartment. Pulled in the drive & further inspection showed some smoke coming from oil cap? None from exhaust. Starts fine runs fine. I do have a PCV connected from rear crankcase vent tube to manifold vacuum. Any thoughts?
Possible that you have too much oil in it ? Running up hill could have had the crank whip up some oil , more that could have been handled by the rings , and it was vented by the cap ? Just guessing of course .
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Old 07-21-2019, 01:30 PM   #7
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Default Re: Smoke from oil cap?

Make sure the vent at the right front corner of the oil pan is unobstructed The PCV can't operate correctly if there is no makeup air source.
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Old 07-21-2019, 02:33 PM   #8
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Default Re: Smoke from oil cap?

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Make sure the vent at the right front corner of the oil pan is unobstructed The PCV can't operate correctly if there is no makeup air source.
There is not any vent on the right front corner of an 8BA oil pan.
It vents at the filler tube.
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Old 07-21-2019, 03:32 PM   #9
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Default Re: Smoke from oil cap?

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Is the PCP valve ball free, i.e. can you hear it rattle if shaken? Maybe it is full of oil or crud.


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What he said.
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Old 07-21-2019, 04:47 PM   #10
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Default Re: Smoke from oil cap?

compression check?
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Old 10-14-2019, 12:08 PM   #11
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Default Re: Smoke from oil cap?

Hey guys, sorry to be so long but was away. So I did a compression test & 7 cylinders r 112 -115 psi but #2 runs from 39 to 80psi & different each time checked. Valve issue?
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Old 10-14-2019, 12:17 PM   #12
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Default Re: Smoke from oil cap?

I think you've had compression issues or a piece of carbon broke off and is in the valve seat and that's not what's causing the blow by , bear with me . As you accelerated up the hill , VACUUM dropped to almost atmosphere, hence no or little vacuum to the PCv , temporarily allowing the fumes to fill and escape the easiest route . It may have filled all passages with oil vapors and oil so it may take a while to clear up .
It's just a guess but the PCv is nothing but a controlled vacuum leak .
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Old 10-14-2019, 01:13 PM   #13
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Default Re: Smoke from oil cap?

I understand what ur saying but the reason I thought maybe valve not closing right letting the exhaust valve pull smoke from crankcase? Today I noticed while warming up before compression check the smoke from the oil input tube comes out put-put-put fashion suggesting exhaust valve effect? For now I removed the pcv valve as it failed from crud. If the smoke issue settles down will put fresh one in. Thinking of using a Mopar type oil cap w vent tube on side of cap to pcv to vent crankase after the smoke issuWhat would u think of Seafoam engine cleaner or what I did as a teen agent auto tranny fruit to clean any carbon out?
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Old 10-14-2019, 03:55 PM   #14
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Default Re: Smoke from oil cap?

Stick a vacuum gauge on it . See if you have a steady reading if steady it's not a valve if low it's something else .
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Old 10-14-2019, 05:07 PM   #15
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Default Re: Smoke from oil cap?

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Originally Posted by AnthonyG View Post
I understand what ur saying but the reason I thought maybe valve not closing right letting the exhaust valve pull smoke from crankcase? Today I noticed while warming up before compression check the smoke from the oil input tube comes out put-put-put fashion suggesting exhaust valve effect? For now I removed the pcv valve as it failed from crud. If the smoke issue settles down will put fresh one in. Thinking of using a Mopar type oil cap w vent tube on side of cap to pcv to vent crankase after the smoke issuWhat would u think of Seafoam engine cleaner or what I did as a teen agent auto tranny fruit to clean any carbon out?



Well...if the smoke from the breather comes out in a puff-puff-puff fashion and compression is low on one cyl the news may be bad. A valve cannot do that-and also can't pull smoke from crankcase. It's time to put air pressure in the low cyl (with both valves closed on that cyl) and watch for air escaping from the crankcase vent. Possibly a piston/ring issue.


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Old 10-14-2019, 05:48 PM   #16
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Default Re: Smoke from oil cap?

100% agree with cadillac512 (Terry).
Also, a PCV system should be a closed system to be ideal. It sounds like your setup is open if you have a stock oil fill cap and you see smoke.


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Old 10-14-2019, 06:16 PM   #17
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Default Re: Smoke from oil cap?

As I indicated I ran 16 Oz of ATF THRU CARB. Shutdown let marinate 4 45 min. Restarted ran till white smoke stopped. Took a 1/2 hour ride & all but a normal bit of crankcase. smoke. Ran fine. Will check comp. on #2 tomorrow.
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Old 10-14-2019, 07:05 PM   #18
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Default Re: Smoke from oil cap?

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Originally Posted by scicala View Post
100% agree with cadillac512 (Terry).
Also, a PCV system should be a closed system to be ideal. It sounds like your setup is open if you have a stock oil fill cap and you see smoke.


Sal
A PCV system will have a place for air to enter - such that the PCV can pull the fresh air through the engine. On a typical OHV setup there is a breather on one valve cover (air to enter) and the PCV pulls it across the engine to the other valve cover.

On a flathead ford - the system is obviously retro-fitted and I don't know where he has the 'incoming air side' of it nor the PCV valve. There should only be one intake side and the best situation is for it to be at the rear of the engine and make sure there is a baffle tube to direct it down into the crankcase. I'd weld up the front block vent tube (cap it) and put he PCV valve into the side of the tube (so it's hidden in the valley). Then I'd plumb my vacuum source under the manifold.
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Old 10-14-2019, 07:23 PM   #19
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Default Re: Smoke from oil cap?

Terry, while #2 cyl. Had the lowest reading @ 39psi the real issue was it was different each time I took it. Lowest was 39 but it was as hi as 97psi. Pretty sure as Ggmac indicated I had piece of carbon messing w a valve or a carboned up valve. I think the ATF thru engine did the trick.
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Old 10-14-2019, 09:42 PM   #20
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Default Re: Smoke from oil cap?

W regard to PCV, when hooked up originally I had routed the rear draft tube into pcv then 2 a vac port on the intake w stock breather cap on oil input tube 2 draw fresh air. When I rehook it up this time I’ll use s Mopar sealed oil cap w vent tube on it 4 pcv coming off the oil cap then going to same vac port on intake & will leave the original rubber draft tube coming out of the rear of engine next to gas pump / filter for fresh air.
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Old 10-14-2019, 10:00 PM   #21
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Default Re: Smoke from oil cap?

Blow by. but a hot motor vapes oil of the downdraft?

Geez does anyone run a regular oil vent system. I've never had concern. Christ these motors leak a bit. Nobody freaked out.


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Old 10-14-2019, 10:48 PM   #22
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Default Re: Smoke from oil cap?

U r right. Engine runs fine w crankcase venting from rear draft tube. Don’t think anyone takes issue w that. Some just prefer a cleaner underside of the car by not letting the draft tube spray vapor laced w dirty oil underneath while rolling down the road. I have put pcv’s on all my pre pcv cars & noticed they’re a lot cleaner on underside when working on them, JMO.
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Old 10-14-2019, 10:59 PM   #23
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Default Re: Smoke from oil cap?

Guess best I can say... from the words of Bruce Lancaster " fords leak oil to protect the underside of the car". Not verbatim.
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Old 10-15-2019, 05:43 AM   #24
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Default Re: Smoke from oil cap?

Glad you got it working as it was . I guess you need to put the pedal to the metal a little more often. I run marvel in my gas , seems to keep everything working nicely.
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Old 10-16-2019, 10:16 AM   #25
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Default Re: Smoke from oil cap?

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Guess best I can say... from the words of Bruce Lancaster " fords leak oil to protect the underside of the car". Not verbatim.
Respectfully sir, without PCV our cities would be uninhabitable. The early day fotos of city blocks show an air quality that prevents seeing much further than a block. I was on the streets in the fifties, slippery when wet was the order of the day. In the late sixties, during rush hour, eyes would burn, the haze was that toxic.

At one time I lived on a busy street. I found black silt on window mouldings and sills, that required attention every few days.

Positive crankcase ventilation saved the day. It made the growth in travel possible. Not to discount paper filters, and electronic fuel injection.
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Old 10-17-2019, 08:54 PM   #26
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Default Re: Smoke from oil cap?

Bones I agree. I'm not saying new technology is bad, certainly not. Just saying if you don't have a pcv and see a drip it's not the end of the world for you or your flathead. Granted 1 in 400,000 cars on the road that you see might be an old flathead today. (yes I made this number up. It's probably 1/1mil on any given day)


But I might as well buy a new car if I want to turn my flathead into a new car....



A vent tube on a 8ba shouldn't be spitting oil. Might be bad rings (blowby).




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Last edited by Tinker; 10-17-2019 at 11:36 PM. Reason: spelling...
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Old 10-21-2019, 08:42 AM   #27
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Default Re: Smoke from oil cap?

The design of the crankcase draft system on the 8BA is a lot better than the 59X and earlier style of engines - by a long shot. BUT - many of us don't like to run a stock 8BA oil draft system - due to the location and look of the stock tubes (they are ugly and can be a real pain to install on many modified engine).

The 8BA system should not be spitting out much oil - but it will always drip some (as will any system of this design). Oil vapors have oil in them - this will collect on the inside of any draft tube that exits to the bottom of the engine . . . and it will drip.

The 59X and earlier road-draft systems will drip a lot more oil . . . and given the oil pan vent location, it all runs down the oil pan and can make quite a mess on your garage floor and the underside of your car. If you're running a stock 59x road-draft system, you either learn to live with it (and buy one of those larger oil drip pans made for your garage), or you can decide to modernize and switch over to a PCV. I tend to live with it . . . but I also clean the underside of my engine quite often.

Just some opinions here . . .
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