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Old 12-25-2007, 07:26 PM
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loosen a seized motor

i have a 69 302 fairlane the motor is seized up the car was sitting for
about 2 years not running what can i do or use to free it up without pulling it out

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Old 12-25-2007, 07:34 PM
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Hi, and welcome to the HR forums!

If it won't turn over and has been sitting, I would not hold much hope for getting it running. Damage has been done. Could be anything from snapped rod or water damage in a cylinder with rings rusted to the cylinder wall. Even if you do manage to "break it loose", I think the chances of it lasting very long are slim to none.

A screw driver prying on the flywheel is about the safest way to try to turn one. Disconnect the converter, push it back into the trans and try turning the engine.(to eliminate a trans problem) Do NOT try turning a locked engine with the front crank bolt, good way to snap it off.

Mark
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Old 12-25-2007, 07:37 PM
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loosen engine

the engine had a new timing chain put in and he never finished putting it together so its locked up just from sitting it has 56000 mi on it
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Old 12-25-2007, 07:43 PM
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That's a tough call. All kinds of things can get stuck, rings/cylinders, bearings, internal damage, valves stuck in guides.

I can't recall if the 302 would beat up pistons/valves when the chain spun but it's possible.

When you say "stuck", do you mean as in won't budge at all, or moves very slowly? Or turns some then stops?

Doesn't sound good.

Mark
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Old 12-25-2007, 07:46 PM
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I would suggest removing the spark plugs and filling each cylinder with some type of penetrating oil, liquid wrench etc. Then take a power handle and try to turn it by the crank bolt, rocking it back and forth. If it just turns a little at a time, you can get it freed up, even if it takes a few days of turning one way till it stops and then back the other way and spraying more lubricant in the cylinders.
I did my brothers inboard that someone left the air cleaner off before he bought it and mother nature did her thing in it. It would at first turn about a half inch in either direction, I would turn it each direction every day, it took about a week of doing this to finally free it up. Each day it would turn just a little bit more, of course this was a six banger and I filled each cylinder to the top, so with a V-8 it may be a little more trouble.


Quote:
Originally Posted by hotrod3z
i have a 69 302 fairlane the motor is seized up the car was sitting for
about 2 years not running what can i do or use to free it up without pulling it out
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Old 12-25-2007, 07:48 PM
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froze

i owned the car 2 years ago it turned over just fine no grinding or any kind of noise the guy i sold it to just parked it in the field and thats where it set untill i got it back he.
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Old 12-25-2007, 07:49 PM
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Marvel Mystery oil in each cylinder.
'Bout a shot glass worth. Let it sit for a day. Use the flywheel/prybar trick to gently 'bump' it. If it doesn't work the first day , leave it for one more and try it again. This trick was taught to me by an old friend , and has 'saved' 2 motors for me , so far.
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Old 12-25-2007, 08:23 PM
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Go with 79C10. Never try to turn a stuck motor with the crank bolt.Prying on the flywheel teeth gives you the most leverage and will not break anything.I have done this many times.Remove spark plugs,Try to see if any water in cylinders if motor was left out . Next pour in Marvel Mystery oil or other penetrant,let sit 1 or 2 days then pry on flywheel and should break loose.My 32 olds sat for 35 years and was lightly stuck,I did this then started it and ran it over 5000 miles. Only problem was it used a little oil.Nobody can make any promises but from what you have said it might even break loose just by prying. Good luck and let us know what happens.
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Old 12-25-2007, 08:49 PM
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My cousin told me about what they did to free up boat motors etc they took a spark plug drilled it out and hooked it up to an airhose.
Shane
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Old 12-26-2007, 11:26 AM
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As long as nothing is broken or wedged Marvel Mystery Oil should do the trick.
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Old 12-26-2007, 12:27 PM
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Stuck

After oiling---If its a stick, jack up one rear tire put it in third (top) gear and rotate the raised tire back and forth by hand. Gives perfect gentle leverage along with the weight of the drivetrain to help break it loose. If it moves, let the oil work overnight.

The worst cases are where a plug is removed or water from the cooling system has breached the cylinder. The rings rust up solid to the wall.
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Old 12-26-2007, 12:46 PM
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Doubleclutch,That works great unless he has an automatic.??
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Old 12-26-2007, 12:50 PM
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We used to free up cummins engines in 5 ton army trucks by pulling the injectors and filling with penetrating oil,let set for a couple of days then pull it at about 20 mph in high gear and let the clutch out. they either broke loose or were really broke after that.These had been setting in junkyards for years sometimes decades.Beleive it or not this usually worked and the trucks ran ok.
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Old 12-26-2007, 04:06 PM
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didnt someone here recommend filling the engine to the valve cover with trans fluid for a week.

tapping on the pistons with a stick/dowel, through the sparkplug hole. might break the rust ridge.
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Old 12-26-2007, 05:23 PM
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Quote:
Originally Posted by barnym17
We used to free up cummins engines in 5 ton army trucks by pulling the injectors and filling with penetrating oil,let set for a couple of days then pull it at about 20 mph in high gear and let the clutch out. they either broke loose or were really broke after that.These had been setting in junkyards for years sometimes decades.Beleive it or not this usually worked and the trucks ran ok.
ROFLMAO!!!!

Mark
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