Frozen Pistons?

[Littlemicrocars]

for seized pistons I remove the push rods and fill the chambers with brake fluid, right up to the spark plug hole. let it sit overnight and then check to see if the brake fluid level as gone down. this means that its seeping past the rings and will eat the rust away.far stronger than penetrating oils. you can also attach a spark plug adapter that accepts an air line or grease fitting... if you use a grease fitting gun you can build up hydraulic pressure to push the brake fluid past the rings and never damage anything... if you use air pressure I hook up a gate valve in line to the spark plug fitting Do the barrel that has the piston closest to tdc first then rotate to the other side. each time backing off the gate valve then do the other side with pressure .. Back and forth .. rocking the rear tire is useless and hard on the trans, and drive shaft ,etc. Often the bmw ISETTA dyno has to be dealt with the grease gun hydraulic pressure method. you must have something to catch the dyno when it comes off, sometimes airborn for several feet---fun part Leo