Stuck 360
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Freshman User
Joined: Sep 2017
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From: Francis
Stuck 360
Just picked up a 72 sport custom with a 360. It was parked about 15 years ago running, but now it's seized up. I hope to get it freed up, just to drive it a bit. More to see what the steering and suspension is like, and get set up to repair anything it needs. My plan is to make the 360 a 390 down the road.
Anyway, lets open a can of worms! What's your suggestions on freeing this thing up, before tearing it down?
p.s. it's an automatic!
Anyway, lets open a can of worms! What's your suggestions on freeing this thing up, before tearing it down?
p.s. it's an automatic!
Cargo Master
Joined: Jul 2015
Posts: 2,067
Likes: 138
From: tucson
First thing I would do is pull the plugs and put a liberal amount of the penetrating oil of your choice into each cylinder. Change the oil. Pull the distributor, and spin the oil pump to get oil where ever it can. Remove the valve covers and soak them with oil. Plan on doing this for a couple weeks. Then try turning the crank with a socket. First one way then the other. Oil her up again and try next week. Check out your gas tank in the mean time.
Cargo Master
Joined: Jan 2016
Posts: 2,672
Likes: 373
First thing I would do is pull the plugs and put a liberal amount of the penetrating oil of your choice into each cylinder. Change the oil. Pull the distributor, and spin the oil pump to get oil where ever it can. Remove the valve covers and soak them with oil. Plan on doing this for a couple weeks. Then try turning the crank with a socket. First one way then the other. Oil her up again and try next week. Check out your gas tank in the mean time.
Also, pull the starter. I've seen them seize up and not turn after an extended "rest" period so it's worth checking.
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
I did a 390 that had sat for 7 years by pulling the plugs and pouring a quart of ATF into all 8 holes, then using a breaker bar, rotated the crank two full turns. Then put a battery on it and cranked it till the cylinders quit squirting ATF. Replaced the plugs and points then poured gas into the carb and hot wired it. Didn't start then because the condenser was bad. Once I changed that, it fired right up and purred like a kitten.
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