Dismantelling a seized 429
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Senior User
Joined: Dec 2002
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From: Wallaceburg On.
Dismantelling a seized 429
I have a 72 429 which has been stored indoors for about 15 years. I have it torn down to the crank and pistons, I have put penetrating oil on the pistons, from top and from underneath still no movement. There appears to be no rust in the cylinders and nothing apparant holding in up. Before I run the risk of breaking something what do you suggest I do next. I have not touched main bearings or anything else until I have a plan. Any suggestions?
As always Thanks in advance
As always Thanks in advance
Post Fiend
Joined: Oct 2003
Posts: 6,214
Likes: 13
From: New Jersey
Originally Posted by Green Streak
I have a 72 429 which has been stored indoors for about 15 years. I have it torn down to the crank and pistons, I have put penetrating oil on the pistons, from top and from underneath still no movement. There appears to be no rust in the cylinders and nothing apparant holding in up. Before I run the risk of breaking something what do you suggest I do next. I have not touched main bearings or anything else until I have a plan. Any suggestions?
As always Thanks in advance
As always Thanks in advance
Take the heads off, put your largest breaker bar on the crank bolt, and shove a 2x4 (shaved if it doesn't fit) into the bore, and whack each piston a few times by hitting the 2x4 with a hammer. By doing this you'll shock each piston and hopefully that will free up the engine. Most of the time this works.
If the crank is frozen because the bearings rusted to the crank, it will take more effort to break it free, but since you're tearing apart the engine anyway you can get at them by taking the mains off.
Senior User
Joined: Jan 2006
Posts: 292
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From: Fort Worth,Texas
Hi I just tore down a 460 I bought as a "runing" engin frome a local junk yard. The center 2 cylenders on each side had some rust in them. I to used the old 2X4 method to get the pistons out. I soked them with penitrating oil and cleaned the heaviest rust out first with a scotch brite wheel anb my trustey dotco. LOL did you know you can do to good of a job I had one piston fall out and hit the corner of the engin stand leg and brake a nice chunk out of the skirt
Good thing I will be puting new pistons in. You don't sound like you have this bad of a problem like outhers have sid you are going to rebild it so you can use a little more force 
Good luck
Bill
Good thing I will be puting new pistons in. You don't sound like you have this bad of a problem like outhers have sid you are going to rebild it so you can use a little more force Good luck
Bill
Post Fiend
Joined: Oct 2003
Posts: 6,214
Likes: 13
From: New Jersey
You have discovered why I disassemble engines with a moving blanket across the engine stand legs 
Though, I've never had a piston fly out like that. Maybe I'm a wuss and don't beat them hard enough!
Though, I've never had a piston fly out like that. Maybe I'm a wuss and don't beat them hard enough!
Senior User
Joined: Jan 2006
Posts: 292
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From: Fort Worth,Texas
Originally Posted by frederic
You have discovered why I disassemble engines with a moving blanket across the engine stand legs
Though, I've never had a piston fly out like that. Maybe I'm a wuss and don't beat them hard enough!
Though, I've never had a piston fly out like that. Maybe I'm a wuss and don't beat them hard enough!
Yes some padding is a great idea in hind sight.
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