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Old 08-14-2020, 11:41 AM   #1
vernlee
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Default 1952 stuck flathead

I bought a 52 F100 flathead complete engine but froze up , I pulled the heads cylinders and pistons look very good , very clean no carbon , I fought the valve removal for two weeks , finally got them out today what a JOB , put a socket on the crankshaft pulley and pop it freed up turns smooth and easy , I kinda assumed it was the valve train that was hanging everything up , now my question , should I go ahead a pull the oil pan and check everything , or just work on the top end with new valves , seats , springs ect .and go for it ? , motor still had clean oil in the original air cleaner and oil filter , crankcase oil looked good also , no signs of moister or anything , motor had been setting for 25 years , what do you think ?

Vern
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Old 08-14-2020, 11:51 AM   #2
GOSFAST
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Default Re: 1952 stuck flathead

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Originally Posted by vernlee View Post
I bought a 52 F100 flathead complete engine but froze up , I pulled the heads cylinders and pistons look very good , very clean no carbon , I fought the valve removal for two weeks , finally got them out today what a JOB , put a socket on the crankshaft pulley and pop it freed up turns smooth and easy , I kinda assumed it was the valve train that was hanging everything up , now my question , should I go ahead a pull the oil pan and check everything , or just work on the top end with new valves , seats , springs ect .and go for it ? , motor still had clean oil in the original air cleaner and oil filter , crankcase oil looked good also , no signs of moister or anything , motor had been setting for 25 years , what do you think ?

Vern
Hi Vern, now's the time to put all new parts in there? Not really all that expensive considering.

Thanks, Gary in N.Y.

P.S. I would also put in some bronze-lined guides, they'll last forever and eliminate any chance of "hanging" a valve over time, been there, done it!
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Old 08-14-2020, 12:44 PM   #3
rockfla
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Default Re: 1952 stuck flathead

Some plastic gauge, rotate the motor and about 2 hours of your time is "Cheap" insurance both in not only the piece of mind of "knowing" BUT also making "SURE" everything is jam up and jelly tight!!!!
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Old 08-14-2020, 02:41 PM   #4
alanwoodieman
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Default Re: 1952 stuck flathead

It has been my experience that the valve train is most likely the problem with a stuck flathead, cast iron valve guides and steel valves. oil drains out of the valve guides and rust sticks the valves to the guides. I would at the least pull the pan and check the connecting rods for wear with plastigauge . clean the oil pan/screen if they check ok and go for it!
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Old 08-14-2020, 02:42 PM   #5
cas3
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Default Re: 1952 stuck flathead

the clean looking oil is an illusion. after a long time the dirt settles to the bottom of the pan, and the oil looks new again
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Old 08-14-2020, 06:07 PM   #6
Ggmac
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Default Re: 1952 stuck flathead

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Id hook up a battery and mechanical oil pressure gauge , change oil and check oil pressure while cranking . If good and you cant move the pistons down while each has just gone past TDC , id say , run it . Check after running for leaks = cracked block . Unless of course you have good supply of money for a rebuild.
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Old 08-14-2020, 06:44 PM   #7
vernlee
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Default Re: 1952 stuck flathead

Sounds like good advise from all , think at the very least I'll pull the pan and check the oil pickup screen and just have a look .
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Old 08-14-2020, 10:12 PM   #8
GB SISSON
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Default Re: 1952 stuck flathead

Plastigauge is a great invention. Rods and mains for sure. For the most part the engines I have checked were in excellent shape. It's a great feeling seeing that wide stripe when you remove the cap!
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