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Old 09-16-2007, 09:48 AM   #1
falconwagon62
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Default How to unlock a locked up motor? FLATHEAD

Ok guys, I am going to keep my flathead in my 59 Rambler, Super Station Wagon (maybe) the motor is locked up...prior owner said it used to spin over, now nothing, whats the best way to free it up? I don't want to bust a ring. Tranny Fluid in the Cly's? Blaster, what worked for you??
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Old 09-16-2007, 09:57 AM   #2
Flatman
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Default Re: How to unlock a locked up motor? FLATHEAD

Pull the plugs and drizzle in some Marvel Mystery Oil. Walk away and let it soak everything good. After a couple of days, try bumping over the engine with a johnson bar on the crank a little bit at a time. If you get a bit of motion, work it back and fourth as it frees up. Don't force it too much, patience is the key.

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Old 09-16-2007, 10:03 AM   #3
foolthrottle
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Default Re: How to unlock a locked up motor? FLATHEAD

fill the cylinders with transmission fluid and let set for a day or two, then put a wrench or socket on the front balancer and gently tap back and forth untill its free. It dosen't take much rust to stick an engine. were they still useing a flat head in 59? I would think it was an old 258 inline ohv?
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Old 09-16-2007, 10:14 AM   #4
Paul Windshield
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Default Re: How to unlock a locked up motor? FLATHEAD

If it's a stick after soaking put it in second and rock back and forth.
Paul
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Old 09-16-2007, 10:56 AM   #5
falconwagon62
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Default Re: How to unlock a locked up motor? FLATHEAD

Thanks, and YES AMC used a Flatty into the 60's! now we know why they are no longer around Lead the pack or be left behind! or be bought out by MOpar.....Thanks guys.....John
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Old 09-16-2007, 11:31 AM   #6
Scarebird
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Default Re: How to unlock a locked up motor? FLATHEAD

Get a can of Kano Labs "AeroKroil". I do not go to the boneyard without a can of this stuff, make 3n1 oil look lame.
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Old 09-16-2007, 11:41 AM   #7
budd
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Default Re: How to unlock a locked up motor? FLATHEAD

i use combustion chamber cleaner.
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Old 09-16-2007, 11:59 AM   #8
Boynamedsue
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Default Re: How to unlock a locked up motor? FLATHEAD

tranny fluid seems to work the best, it has better detergants in it.
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Old 09-16-2007, 12:42 PM   #9
falconwagon62
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Default Re: How to unlock a locked up motor? FLATHEAD

just filled it with Tranny fluid! now WAIT....
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Old 09-16-2007, 06:50 PM   #10
falconwagon62
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Default Re: How to unlock a locked up motor? FLATHEAD

pulled the head tonight, insides NASTY.....still can't flip it over, guess I got to let it sit, DAM I hate to wait!!!!!!!!!!
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Old 09-16-2007, 06:54 PM   #11
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Default Re: How to unlock a locked up motor? FLATHEAD

I remember using kerosene to unstick a T truck engine in the 60's. Just kept filling the cylinder heads and letting it run through into the sump for a week, then drained the sump, oiled her up and she fired!

Cheers, Glen.
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Old 09-16-2007, 09:09 PM   #12
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Default Re: How to unlock a locked up motor? FLATHEAD

Quote:
Originally Posted by Scarebird View Post
Get a can of Kano Labs "AeroKroil". I do not go to the boneyard without a can of this stuff, make 3n1 oil look lame.
Kroil is the best penetrant on earth! I practically soaked my 'stude flattie in it, and had no problems breaking anything free. Plus, it kinda smells like hopp's nitro solvent!
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Old 09-16-2007, 09:49 PM   #13
Don Lyon
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Default Re: How to unlock a locked up motor? FLATHEAD

Ditto to what Scarebird and Overkillphil said. Aerokroil or plain old "Kroil" as it's known in aviation circles is the BEST unfreezing, unlocking,bustin' loose product there is. even use it in all my air tools.
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Old 09-16-2007, 10:07 PM   #14
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Default Re: How to unlock a locked up motor? FLATHEAD

I will agree that Kroil is the best. We take apart 100 year old steam lines with the stuff. Yea let it soak too, but for about half the time of others. I love it the next thing you know you are using the stuff on everything. Shit I have a can in the shower.
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Old 09-16-2007, 10:35 PM   #15
Mockie
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Default Re: How to unlock a locked up motor? FLATHEAD

Marvel mystery oil down the plug holes worked fine for me, let her set 3 days before trying and broke loose easily after that. Motor was a 235 that had been sitting for 50 + years.
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Old 09-16-2007, 11:09 PM   #16
Goztrider
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Default Re: How to unlock a locked up motor? FLATHEAD

My uncle is a retired diesel and tractor mechanic. Whenever he buys an old tractor to fix that has a locked up motor, he'll load it on his trailer, throw a big safety chain on that he can secure loose enough so the tractor can't roll off the back of the bed, and take off down the back country roads - starting and stopping the whole way with the tractor in gear. After about a good hour or two of this, he'll often be able to get the starter to turn the motor over on its own.
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Old 12-08-2010, 05:48 PM   #17
ccrain
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Default Re: How to unlock a locked up motor? FLATHEAD

Quote:
Originally Posted by Boynamedsue View Post
tranny fluid seems to work the best, it has better detergants in it.
Okay i have a 74 pinto and the motors stuck solid i have filled the spark plug holes with transmission oil if i do get the motor un stuck do i have to worry about all the tranny fluid i put in it,if so how do i get it out?Drain the oil
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Old 12-08-2010, 05:51 PM   #18
adjustablejohnsons
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Default Re: How to unlock a locked up motor? FLATHEAD

Seems like everytime someone has a stuck flathead all the advice assumes the pistons are stuck. Don't overlook the valve train.
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Old 12-08-2010, 06:04 PM   #19
J'st Wandering
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Default Re: How to unlock a locked up motor? FLATHEAD

Quote:
Originally Posted by ccrain View Post
Okay i have a 74 pinto and the motors stuck solid i have filled the spark plug holes with transmission oil if i do get the motor un stuck do i have to worry about all the tranny fluid i put in it,if so how do i get it out?Drain the oil
It doesn't matter. You can drain the oil but it will still be a pinto.

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Old 12-08-2010, 06:14 PM   #20
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Default Re: How to unlock a locked up motor? FLATHEAD

Anybody messin around with rusty or seized parts should try that kroil oil that stuff works freakin awesome.Ive worked on mechanically f'd up stuff for years.
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