Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 07-21-2019, 10:21 AM   #1
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,488
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?
__________________
Nomad
AnthonyG is offline   Reply With Quote
Old 07-21-2019, 10:33 AM   #2
oldskool
Senior Member
 
oldskool's Avatar
 
Join Date: May 2010
Location: shirley ny
Posts: 872
Default Re: Smoke from oil cap?

shouldn't the pcv valve be installed where the draft tube used to be?
oldskool is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 07-21-2019, 10:54 AM   #3
glennpm
Senior Member
 
glennpm's Avatar
 
Join Date: Sep 2014
Location: Wiscasset, Maine
Posts: 725
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.


Glenn
glennpm is offline   Reply With Quote
Old 07-21-2019, 11:00 AM   #4
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,488
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
__________________
Nomad

Last edited by AnthonyG; 07-21-2019 at 11:16 AM.
AnthonyG is offline   Reply With Quote
Old 07-21-2019, 11:17 AM   #5
19Fordy
Senior Member
 
19Fordy's Avatar
 
Join Date: May 2010
Location: Coral Springs FL
Posts: 7,171
Default Re: Smoke from oil cap?

Photos please.
19Fordy is offline   Reply With Quote
Old 07-21-2019, 12:56 PM   #6
Ggmac
Senior Member
 
Join Date: Jul 2016
Location: Lake worth Florida
Posts: 430
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 .
Ggmac is online now   Reply With Quote
Old 07-21-2019, 01:30 PM   #7
supereal
Senior Member
 
supereal's Avatar
 
Join Date: Jul 2014
Location: Iowa
Posts: 1,349
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.
supereal is offline   Reply With Quote
Old 07-21-2019, 02:33 PM   #8
34PKUP
Senior Member
 
34PKUP's Avatar
 
Join Date: Feb 2011
Posts: 633
Default Re: Smoke from oil cap?

Quote:
Originally Posted by supereal View Post
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.
34PKUP is offline   Reply With Quote
Old 07-21-2019, 03:32 PM   #9
ford38v8
Senior Member
 
ford38v8's Avatar
 
Join Date: Jul 2011
Location: SF Bay Area
Posts: 5,001
Default Re: Smoke from oil cap?

Quote:
Originally Posted by glennpm View Post
Is the PCP valve ball free, i.e. can you hear it rattle if shaken? Maybe it is full of oil or crud.


Glenn
What he said.
__________________
Alan
ford38v8 is offline   Reply With Quote
Old 07-21-2019, 04:47 PM   #10
40cpe
Senior Member
 
40cpe's Avatar
 
Join Date: May 2010
Location: Star, MS
Posts: 3,356
Default Re: Smoke from oil cap?

compression check?
40cpe is online now   Reply With Quote
Old 10-14-2019, 12:08 PM   #11
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,488
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?
__________________
Nomad
AnthonyG is offline   Reply With Quote
Old 10-14-2019, 12:17 PM   #12
Ggmac
Senior Member
 
Join Date: Jul 2016
Location: Lake worth Florida
Posts: 430
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 .
Ggmac is online now   Reply With Quote
Old 10-14-2019, 01:13 PM   #13
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,488
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?
__________________
Nomad
AnthonyG is offline   Reply With Quote
Old 10-14-2019, 03:55 PM   #14
Ggmac
Senior Member
 
Join Date: Jul 2016
Location: Lake worth Florida
Posts: 430
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 .
Ggmac is online now   Reply With Quote
Old 10-14-2019, 05:07 PM   #15
cadillac512
Junior Member
 
Join Date: Apr 2019
Location: Kansas
Posts: 29
Default Re: Smoke from oil cap?

Quote:
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.


Terry
__________________
"It don't take but country smarts to solve the problem" (Smokey Yunick)
cadillac512 is offline   Reply With Quote
Old 10-14-2019, 05:48 PM   #16
scicala
Senior Member
 
scicala's Avatar
 
Join Date: Jun 2010
Location: Detroit suburb, MI
Posts: 2,593
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.


Sal
scicala is online now   Reply With Quote
Old 10-14-2019, 06:16 PM   #17
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,488
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.
__________________
Nomad
AnthonyG is offline   Reply With Quote
Old 10-14-2019, 07:05 PM   #18
Bored&Stroked
Senior Member
 
Bored&Stroked's Avatar
 
Join Date: Jan 2011
Location: Central Ohio
Posts: 2,246
Default Re: Smoke from oil cap?

Quote:
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.
Bored&Stroked is offline   Reply With Quote
Old 10-14-2019, 07:23 PM   #19
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,488
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.
__________________
Nomad
AnthonyG is offline   Reply With Quote
Old 10-14-2019, 09:42 PM   #20
AnthonyG
Senior Member
 
AnthonyG's Avatar
 
Join Date: May 2013
Location: Pa.
Posts: 1,488
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.
__________________
Nomad
AnthonyG is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 07:38 PM.