8rt oil pan on 1950 8ba block?

denson1932

denson1932

Senior Member
Ok first let me admit i have macular degen. So i have about 35% eyesight... But i still do prettty go0d building 1932 fords and 1962 chevys. Hopefully the pixs attached will show the mistake i am making trying to find an oil pan for this 8ba block.
The oil pans i bought will not fit. The 'long' one of course is a 1946-48 59ab but because it has the removeable rear section i hoped i could trim it even more to work on the 8ba block, but no the rear bolt holes oil pan vs block are not compatable. And 8ba uses a 'modern' rear oil pan oil seal.
So i bought the 'short' oil pan shown....supposedly 8rt only to find to will not seat down onto the block. Note from the pixs i had our 15 year old daughter take, the gap is about 3/8" rear and 1/4" front. I know i have no oil pan gasket on yet for pixs...but this is not going to fit unless i stack 3 or 4 gasket sets. Oh and please note i haven't even installed an oil pump nor pickup tube yet. the rear main cap is cast 8ba and the front is cast 7ba? huh?
Any help appreciated as i'm stumped.
 

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denson1932 said:
Ok first let me admit i have macular degen. So i have about 35% eyesight... But i still do prettty go0d building 1932 fords and 1962 chevys. Hopefully the pixs attached will show the mistake i am making trying to find an oil pan for this 8ba block.
The oil pans i bought will not fit. The 'long' one of course is a 1946-48 59ab but because it has the removeable rear section i hoped i could trim it even more to work on the 8ba block, but no the rear bolt holes oil pan vs block are not compatable. And 8ba uses a 'modern' rear oil pan oil seal.
So i bought the 'short' oil pan shown....supposedly 8rt only to find to will not seat down onto the block. Note from the pixs i had our 15 year old daughter take, the gap is about 3/8" rear and 1/4" front. I know i have no oil pan gasket on yet for pixs...but this is not going to fit unless i stack 3 or 4 gasket sets. Oh and please note i haven't even installed an oil pump nor pickup tube yet.
Any help appreciated as i'm stumped.
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The oil pan with the clean out cover is correct. It is the truck version of the '49 - '53 motor. "8RT".
I can't see anything obvious as to why it won't fit. Start by laying a sheet of aluminum foil over the motor before trying the oil pan on.
 
Each of the 8BA oil pans require the use of all related components. The truck pan is unique in that it has the extra bolt on piece at the back that has the dust seal. All of them have their own half bell and the truck is generally cast iron so it can support the 4-speed T8 or T9 transmission if it is so equipped.

The Mercury pan from 1949 through 1951 is a rear sump and has an extra set of three fasteners on fitting at the rear to allow the starter plate and pressed steel half bell to become part of the structure of the pan for added strength. It's the best one for conversions for 8BA to replace earlier engines like the 59 series,
 
the story on this 8ba is it was on marketplace in NEB. FOR $200 but we burned another $200 in gas going to get it. it was supposedly overhauled in the 80s by a VO-TECH in WY. but never put in service...NO oil pan no sparkplugs... kept inside all these years...but filthy dirty because the sandhills of Neb have dust storms when the wind blows. came with a spare junk engine for the oil pan but turns out to be a 59ab...
Anyway i removed the rear main bearing cap, still interference. then i removed a pair of rod caps to verify the crank is 8ba with 2 oil supply holes per rod journal and not only one hole per journal like a 59ab. The crank and rods and main bearing caps are all 8ba. it has all new valves and hardware. it has 4 ring pistons with some carbon on the top of them. it has excellent bores all holes with filthy dirty grease coating and NO ridge no sleeves and 3 3/16 bore but i need to have a friend double check me on that...
ANYWAY THE PROBLEM SEEMS TO BE THEY INSTALLED THE UPPER HALF OF THE REAR MAIN OIL SEAL INTO THE BLOCK CLOCKED SO ONE SIDE IS UP ABOUT 1/4" AND THE OTHER SIDE IS RECESSED DOWN (UP) INTO THE BLOCK. SO WHEN I TRY TO PUT THE OIL PAN ON, THE METAL CHANNEL OF THE OIL PAN THAT IS FOR THE LOWER (OIL PAN) HALF OF THE REAR SEAL, IT SITS ATOP THE PROTUDING SEAL RIGHT NEXT TO THE MAIN BEARING CAP.! GO FIGGURE... THE vo-tech STUDENTS MUST HAVE BEEN AS STUMPED AS I WAS SO THEY GAVE UP AND THATS WHY THE ORIGIONAL OIL PAN WAS NOT INSTALLED AND FINALLY GOT MISPLACES!
 
I think you have found your problem with pan figment.

Also, Just a couple of observations.
(1) the rear bracket of your 8RT pan has been torched off. Compare [post#2] 3rd picture with [post#3] 2nd picture.
(2) pal nuts are missing from your connecting rods. Change to modern nuts and re-torque.
 
There used to be a photo record of all the different oil pans and bell housings with starter plates for the flatheads. I think it was on the old Flathead Technosite that is now gone for the most part. There may still be photos of the various combinations on here if a search is made.

The thing to remember is that the oil pans and bell housings/starter plates are all related. The link is to flea-pay for a photo of the seal retainer on 8BA family trucks. Finding illustrations for this stuff is difficut so I included it here.
https://www.ebay.com/itm/3273055951...dEz8xU6X4Gjhyk1HWsGblxLS4=|tkp:Bk9SR-DJ9ZGJaA
 
Hopefully it isn't glued in with sealer. They are rotated in and carefully rotated out for overhaul cleaning. It is likely zinc die cast so they bend and break easily. If it's sealed in then the sealer will have to be soaked in a strong solvent. It may even require heat to move it but don't leave flammable material on it if using open flame around it. Zinc will melt at a lower temp. I've left them in for hot tanking and they disappear pretty quick if you just want it out of there. The thing may need disassembly anyway if it's full of crud.
 
Hey Denson, saw that you are in Rapid City, SD. I'm currently in SD and will be here until later in the Fall. If you need any help with your engine, let me know - might be able to come over and lend a hand. Take care!

daleohays@gmail.com
 
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