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 11-25-2019, 10:05 PM   #1
Eagle43
Member
 
Join Date: Nov 2018
Location: Edmonton, AB
Posts: 39
Default 8BA Low Oil Pressure

I installed a rad on my 1951 flathead which I rebuilt last winter and intend to install in my 1952 F1 and ran it for a bit last Saturday. I have the motor sitting on a cart and I have an oil pressure gauge mounted. I found that the oil pressure went lower and lower as the engine warmed up until it was almost zero at idle. It was about 15 lbs cold. When I ran it briefly a couple of weeks ago without the rad I think it was about 40 lbs but flickering a lot. I thought it might be the gauge so I installed a different one today with the same result. Is there a way to adjust the pressure to get it higher? I see the slotted head of a machine screw or bolt and what looks like a small round plate. I tried removing this but it refuses to budge despite applying some heat. I've attached a picture. Any advice on how to get a more acceptable oil pressure?
Attached Images
File Type: jpg Oil pressure.jpg (117.1 KB, 139 views)
Eagle43 is offline   Reply With Quote
Old 11-25-2019, 10:10 PM   #2
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 13,358
Default Re: 8BA Low Oil Pressure

What you are calling a screw is part of the block casting. There is no external adjustment for the oil pressure. What is the "to sump" marked in your photo? That should be an oil filter connection and would require a restrictor. Remove that line and install a plug in the fitting and see what your oil pressure is.
JSeery is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 11-25-2019, 10:28 PM   #3
Tinker
Senior Member
 
Tinker's Avatar
 
Join Date: May 2010
Location: MN/FL
Posts: 5,086
Default Re: 8BA Low Oil Pressure

Pressure sounds fine except for the flickering. Flatheads are a low pressure system. At hot idle 15lbs is fine depending on the engine your building or what it is.


As oil gets hot it will get thinner. So if you start out cold at 15 and then go to 0. Could be bearings or a bad/worn pump.
Tinker is offline   Reply With Quote
Old 11-25-2019, 10:59 PM   #4
40cpe
Senior Member
 
40cpe's Avatar
 
Join Date: May 2010
Location: Star, MS
Posts: 3,423
Default Re: 8BA Low Oil Pressure

jseery is correct. We need to know more about that line labeled "to sump". What is it connected to?
40cpe is offline   Reply With Quote
Old 11-25-2019, 11:06 PM   #5
Tinker
Senior Member
 
Tinker's Avatar
 
Join Date: May 2010
Location: MN/FL
Posts: 5,086
Default Re: 8BA Low Oil Pressure

Well isn't it normal that there is only one opening there for the electronic oil pressure gauge. People drilled and tapped it for oil filters (later yrs may have both). So maybe someone plumbed this in a wild way after removing the filter?


Certainly if that "to the sump" just drops oil into the pan or valley it would lower oil pressure.
Tinker is offline   Reply With Quote
Old 11-25-2019, 11:11 PM   #6
51 MERC-CT
Senior Member
 
51 MERC-CT's Avatar
 
Join Date: May 2010
Location: Hartford, Ct
Posts: 4,623
Default Re: 8BA Low Oil Pressure

The line you have labeled "sump" should be going to the input side of the oil filter.
If you don't have a filter then that port should be plugged.
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES
51 MERC-CT is offline   Reply With Quote
Old 11-25-2019, 11:23 PM   #7
flatjack9
Senior Member
 
flatjack9's Avatar
 
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 3,507
Default Re: 8BA Low Oil Pressure

Quote:
Originally Posted by Tinker View Post
Well isn't it normal that there is only one opening there for the electronic oil pressure gauge. People drilled and tapped it for oil filters (later yrs may have both). So maybe someone plumbed this in a wild way after removing the filter?


Certainly if that "to the sump" just drops oil into the pan or valley it would lower oil pressure.
All flatheads have 2 - 1/4" pipe connections at the back of the block just as his picture shows.
flatjack9 is offline   Reply With Quote
Old 11-25-2019, 11:53 PM   #8
cas3
Senior Member
 
Join Date: Jan 2011
Location: sw minnesota
Posts: 1,933
Default Re: 8BA Low Oil Pressure

jseery has it, your "sump" line needs to be plugged if no filter, not returned to the oil pan. the bypass system uses that line for the filter, but it is restricted so that real pressure is sent off to the rest of the motor. you have only run it a short bit, i would guess some oil was getting to the bearings and hopefully you are ok yet. plug it, run it, and see what you get
cas3 is offline   Reply With Quote
Old 11-26-2019, 12:41 AM   #9
Tinker
Senior Member
 
Tinker's Avatar
 
Join Date: May 2010
Location: MN/FL
Posts: 5,086
Default Re: 8BA Low Oil Pressure

Quote:
Originally Posted by flatjack9 View Post
All flatheads have 2 - 1/4" pipe connections at the back of the block just as his picture shows.

Yes... but early fords 38 "21 bolt" back to 32 only had one. At least my early 38 only had one for the oil sensor (maybe I got the only block). I had it drilled on the off chance I might use a spinoff filter. I have plugged it.
Tinker is offline   Reply With Quote
Old 11-26-2019, 01:18 AM   #10
Eagle43
Member
 
Join Date: Nov 2018
Location: Edmonton, AB
Posts: 39
Default Re: 8BA Low Oil Pressure

Well, I obviously screwed up. I'll plug up the hole tomorrow and hope for the best. This sure is a great forum. I got my answer within in a couple of hours. Thanks everyone.
Eagle43 is offline   Reply With Quote
Old 11-26-2019, 05:26 AM   #11
Brian
Senior Member
 
Brian's Avatar
 
Join Date: May 2010
Location: Masterton, New Zealand
Posts: 2,479
Default Re: 8BA Low Oil Pressure

Yes... but early fords 38 "21 bolt" back to 32 only had one. At least my early 38 only had one for the oil sensor (maybe I got the only block). I had it drilled on the off chance I might use a spinoff filter. I have plugged it.



Respectfully, I must question this above quote.....


Flatjack9 is correct.

Every flathead I've ever seen has two drilled and tapped holes at back of block. Some have three. You must have the only block in existence with the one hole, as you state.
__________________
Unfortunately, two half wits don't make a whole wit!
Brian is offline   Reply With Quote
Old 11-26-2019, 09:11 AM   #12
19Fordy
Senior Member
 
19Fordy's Avatar
 
Join Date: May 2010
Location: Coral Springs FL
Posts: 7,335
Default Re: 8BA Low Oil Pressure

Eagle43: I think you have your lines reversed in the first photo.

When I removed the oil filter from my 8BA I plugged the threaded return hole in the side of the block and also installed a plug in the horizontal hole at rear of the stock block. I then installed an 1/8 in. pipe thread vertical pipe and and mounted an oil pressure sender sender gauge to the top of that pipe with an oil pressure shut off switch lower down for my electric fuel pump. Oil pressure gauge reads 45 lbs cold and about 25 hot. Ran that for many years with no problems.

In the photo you can see the oil pressure sending unit at the top and the electric fuel pump shut off with the blue terminals attached.
Attached Images
File Type: jpg IMG_7744b.jpg (54.2 KB, 59 views)
File Type: jpg IMG_7743b.jpg (75.6 KB, 49 views)
File Type: jpg IMG_7746b.jpg (57.5 KB, 49 views)

Last edited by 19Fordy; 11-26-2019 at 09:30 AM.
19Fordy is offline   Reply With Quote
Old 11-26-2019, 09:17 AM   #13
Zeke3
Senior Member
 
Zeke3's Avatar
 
Join Date: Dec 2014
Location: Columbus, IN
Posts: 110
Default Re: 8BA Low Oil Pressure

The OP's engine appears to have a plug under the word "What" in the picture. You should confirm whether this engine has a grub screw installed in the oil passage where the line to the sump is plumbed. See the attached link for more discussion about the screw.
https://www.fordbarn.com/forum/showt...ght=grub+screw
Zeke3 is online now   Reply With Quote
Old 11-26-2019, 09:50 AM   #14
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 13,358
Default Re: 8BA Low Oil Pressure

Quote:
Originally Posted by 19Fordy View Post
Eagle43: I think you have your lines reversed in the first photo. When I removed the oil filter from my 8BA I plugged the threaded return hole in the side of the block and also installed a plug in the horizontal hole at rear of the stock block.
Why would it make any difference which hole at the back of the block was used for the oil pressure sending unit, they go to the same passage!
JSeery is offline   Reply With Quote
Old 11-26-2019, 10:01 AM   #15
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 13,358
Default Re: 8BA Low Oil Pressure

Eagle, do you know what oil pump is in the engine? If it is the normal oil pump that opening needs to be plugged. But if it is some type of full flow external filter setup, that is a different issue.

Last edited by JSeery; 11-26-2019 at 10:10 AM.
JSeery is offline   Reply With Quote
Old 11-26-2019, 10:18 AM   #16
Desoto291Hemi
Member
 
Join Date: Oct 2019
Location: Carthage , Tennessee
Posts: 73
Default Re: 8BA Low Oil Pressure

The What is it looks like a casting mark left over from the original molds.
I have seen these many times in other engine blocks.
I am new to Flatheads ,,,,I could be wrong,,,but that is what it looks like to me .

Tommy
Desoto291Hemi is offline   Reply With Quote
Old 11-26-2019, 11:27 AM   #17
51 MERC-CT
Senior Member
 
51 MERC-CT's Avatar
 
Join Date: May 2010
Location: Hartford, Ct
Posts: 4,623
Default Re: 8BA Low Oil Pressure

The engine appears to be Canadian with the 3rd oil access port.
Attached Images
File Type: jpg Oil pressure.jpg (53.9 KB, 216 views)
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES
51 MERC-CT is offline   Reply With Quote
Old 11-26-2019, 11:30 AM   #18
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 13,358
Default Re: 8BA Low Oil Pressure

Good catch 51 Merc!! That needs to be checked to see if the horizonal passage is open or plugged. The horizonal passage that has the 7/16 Allen screw in it has to be open. The screw should not be there in your application! And of the two ports on the left in the diagram labeled 3/8 NPT, one should be plugged and the other used for the oil pressure sender. Does not matter which port you plug and which you use for the oil sender. The port on the right labeled oil return should be plugged as well (as it appears it already is).

I would guess the set screw is already removed and the issue is the one 3/8 port being plumbed to the sump. But it would sure be worth checking for the set screw just to be safe.
Attached Images
File Type: jpg 95oilplug.jpg (50.9 KB, 27 views)

Last edited by JSeery; 11-26-2019 at 11:43 AM.
JSeery is offline   Reply With Quote
Old 11-26-2019, 11:51 AM   #19
19Fordy
Senior Member
 
19Fordy's Avatar
 
Join Date: May 2010
Location: Coral Springs FL
Posts: 7,335
Default Re: 8BA Low Oil Pressure

Eagle 43: Are you using the required oil restrictor fitting on the inlet line of your oil filter canister? This effects oil pressure reading. Read about it here:
https://www.fordbarn.com/forum/showthread.php?t=215241

First photo below: Special T restrictor fitting where oil enters filter canister. Oil pressure sending unit is at top of fitting.
2nd photo: "S" shaped line from block that goes to inlet restrictor fitting on canister.
3rd photo: Oil return line from bottom of canister to threaded fitting in block where oil returns to pan.
This canister came off a 1950 Mercury car.


Also, Thanks to all for the helpful input on my "reversed lines" theory. Will be interesting top see the final outcome. Hope it works out well.
Attached Images
File Type: jpg IMG_5454b.jpg (61.1 KB, 27 views)
File Type: jpg IMG_5457b.jpg (57.8 KB, 26 views)
File Type: jpg IMG_5456b.jpg (68.1 KB, 22 views)

Last edited by 19Fordy; 11-26-2019 at 01:43 PM.
19Fordy is offline   Reply With Quote
Old 11-26-2019, 01:52 PM   #20
Desoto291Hemi
Member
 
Join Date: Oct 2019
Location: Carthage , Tennessee
Posts: 73
Default Re: 8BA Low Oil Pressure

51Merc,
That looks much better,,,the original pic was inverted.
The third plug was hidden behind the words,,,,I thought I was losing my mind,,,lol.

isn’t the third one where the oil line should go,,,according to the diagram,,,if running a full flow filter ?
Isn’t that why the set screw is inserted into the oil passage,,to keep the oil going in the right direction ?

Tommy
Desoto291Hemi 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 10:43 AM.