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Old 11-14-2013, 09:20 PM
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Mercury Flathead

Bought a Mercury flathead today. I've never owned a flathead before but I came across this one and it was going to the scrap yard. Didn't want that to happen so the guy sold it to me for $60. Don't know if its any good but wanted to save it.
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Old 11-14-2013, 09:27 PM
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are you planning to install the engine in the Mustang?
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Old 11-14-2013, 09:44 PM
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hey for $60 that's a deal. now the next step is to Flush it good real good and rip it a part!! and see what you got
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Old 11-14-2013, 10:11 PM
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The distributor gives it away as a '49-'53 motor. The 8CM truck motors were produced up through '56. It could be a Ford motor with Mercury 8CM heads on it though. Fords (8BA) had 3 3/4" cranks for a displacement of 239 cubic inches. The Mercurys had a 4.000" stroke, for a displacement of 255 cubic inches and the heads had a larger combustion chamber to lower static compression ratio so that the 8BA and the 8CM had the same SCR. So, the 4" crank with smaller volume Ford heads would be the hot tip. Best way to find out if the motor has a 4" crank is to drop the pan and measure. I don't remember if you can tell by casting numbers or not.

This from babyearl on the HAMB......
"The Merc crank will be marked 1CM, the soft plugs in the rod journal oil galley are 5/8. The ford crank rod journal soft plugs are 3/8.
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Old 11-14-2013, 10:26 PM
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Looking at the carb and breather it appears to be a true Merc engine 1949 through 1951. Intake and heads could be changed but not likely. The number on the heads may give you a clue to the year. 8cm would be 1949 1cm would be a 1951 for example.

John
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Old 11-15-2013, 12:25 AM
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It sure does look like it Its an 8 CM I enlarged the pic

I worked on a lot of F heads through the years and a few of the L head 337 cu in. Truck and Lincoln engines and one "Alexander" OHV conversion when owning my shop, and a couple of Arden dump truck engines with my father as a boy, and I ran a Hilborn injected flatty in a 50 ford when I was just starting to drive LOL I got my License at 14 years old because I had 2 paper routes 1 before school and 1 after in 1960 in Ecorse Township (A Farm area then) Michigan and Detroit Dragway was a stones throw from my home and I raced the 50 ford there when I was in high school It was great That f head pic I found looks like my old engine except I had short stacks The other is a picture I found of a "Alexander" OHV conversion!! Very Pretty

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http://www.hotrodders.com/forum/atta...1&d=1384499062

http://www.hotrodders.com/forum/atta...1&d=1384499334
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Old 11-15-2013, 07:40 AM
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Thanks for all the replies. The motor was still in the car,it was a 1949 Mercury.I heard about an old farm they were cleaning up. I guess the owner which is deceased now let people dump old cars,trucks,tractors and such there.That started I was told 40 or 50 years ago.Most of the cars were 40s,50s and 60s.Around 400 of them,when I found out about it the salvage people had it pretty much done. All the cars got crushed,the Mercury was one of the last ones left. I pleaded with the guys to let me get the motor out. I had to get in out quick which I did then the car got crushed. I sure wish I could have been there before they got started.Not sure yet what I'll do with it, maybe block is bad and can't be saved.
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Old 11-15-2013, 08:41 AM
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Quote:
Originally Posted by spanky36 View Post
Thanks for all the replies. The motor was still in the car,it was a 1949 Mercury.I heard about an old farm they were cleaning up. I guess the owner which is deceased now let people dump old cars,trucks,tractors and such there.That started I was told 40 or 50 years ago.Most of the cars were 40s,50s and 60s.Around 400 of them,when I found out about it the salvage people had it pretty much done. All the cars got crushed,the Mercury was one of the last ones left. I pleaded with the guys to let me get the motor out. I had to get in out quick which I did then the car got crushed. I sure wish I could have been there before they got started.Not sure yet what I'll do with it, maybe block is bad and can't be saved.
Unfortunately there is a very good chance the block will turn out to be bad but it is well worth checking. Since the Flathead can be bored 125 thousands or more there is a good chance it can be saved even if the cylinders are rusty as long as it is not cracked. Cracks can be repaired but it begins to get pricey.

They are not a cheap engine to build but sure are pretty and a lot of fun.

Even though they do not make gobs of HP they do have plenty of toque, kind of like an old Harley. Mine will walk over Monteagle Mountain in middle Tennessee in 5th gear overdrive and that is a 5 mile long 6 degree grade.

Good luck

My contribution to saving the flatheads below.


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Old 11-15-2013, 08:45 AM
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If you can't repair the block internally, build a stand, paint it up pretty etc etc and make some garage art out of it. You did the right thing. Thanks for saving a piece of history.
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Old 11-15-2013, 09:40 AM
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Like most on hear been a car guy since I was a kid. Couple Mustangs but all others were and still are street rods.Always used SBC in the rods cause thats what I grew up with.Know nothing about flatheads but always thought they were one of the coolest engines out there. Hope block is good if not that is what I was going to do, paint it up real nice put it on engine stand in the shop and just enjoy looking at it.
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Old 11-15-2013, 05:29 PM
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Flatheads Forever!
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Old 12-01-2013, 07:07 PM
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Originally Posted by spanky36 View Post
Like most on hear been a car guy since I was a kid. Couple Mustangs but all others were and still are street rods.Always used SBC in the rods cause thats what I grew up with.Know nothing about flatheads but always thought they were one of the coolest engines out there. Hope block is good if not that is what I was going to do, paint it up real nice put it on engine stand in the shop and just enjoy looking at it.
It's a complete engine that has sat all sealed from the weather. If it didn't freeze and crack, the cylinders may just have a surface rust. I am betting it will turn over with some soaking after the heads are removed...
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Old 12-02-2013, 08:18 AM
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Removed the heads and left bank looked good but back cylinder on right bank cracked bad. Looks like a freeze crack to me. Was very disappointed .
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Old 12-02-2013, 10:12 AM
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In some cases the cracks can be repaired and the cylinder sleeved,there are a fair amount of flathead forums on the web and the HAMB has a Social Group with a large amount of members for Flatheads only,if you decide to scrap the block the Merc cranks will more than pay you back your $60.
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Old 12-02-2013, 12:19 PM
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They crushed a '49merc? and the engine is all that was saved?
Incredible.
Sleeving a flattie is no big deal, where you need to look is cracks between the valves. Fixing them is the expensive part that others spoke of. the crank is valuable, if the block is ruint (as we say here in Virginia) the crank alone will fetch a fair price.
before you invest any real money get a book on flatties and read about them, modern machine shops aren't familiar with the little things that matter with a flattie. maybe you'll find a retired machineinst that would do it as a project.
Nothing sounds as sweet as a hot rod merc. That sound is priceless. The 2nd closest thing is a mahogany ChrisCraft with a 312 Y block burbling at the dock.
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