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Re: removing stuck pistons?
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Posted by Steve A Reno on June 19, 2004 at 04:47:30 from (207.46.238.138):
In Reply to: removing stuck pistons? posted by curtis on June 18, 2004 at 20:13:54:
Are you trying them one at a time? I had similiar lack of success with an F-12. I used a bottle jack with a 4 x 4 against the rafters and a jig that pushed down on the two offending cylinders pushing down until I thought I would put the 4 x 4 through the roof. Eventually I tried from underneath the engine block taking off the bottom of the piston rod cap and with a block of wood against the piston rod hitting it with a good sized single jack. It moved ever so slightly and so I went up above and repeated the process from up top. By alternating the blows from top and bottom and by washing down the sides of the cylinder with Liquid Wrench to wash away carbon and rust I freed it up in about 5 minutes. It was amazing how easily it moved once it was cleaned. I'd give something to know the exact physics of why it held so firmly in the first place. My only theory is that the cummulative affects of two frozen pistons combined to produce a sticking power that simply could not be overcome except one at a time. There is absolutely NO way I could have ever freed them up by turning that crank, dragging it in gear or wailing on it with a sledge hammer with both of those things still attached to the crank shaft.
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