we just bought 23 roadster barn find that has been sitting for about 3 years. when trying to turn the crank the engine wont budge. would using some marvel mystrey oil or something to that nature help or are we looking at an engine rebuild. what iscool is we went to buya model a and the guy had a t that we liked better. Now my 27 wont be alone in the garage.
PB Blaster is good, kerosene or diesel is good too, and I've used ATF many times to cut loose engines that aren't stuck too bad. Also used a grease gun if you can find which cylinder is stuck (and positive it is the only one). Fill up the cylinder with heavy oil and adapt the plug hole down to 1/4" NPT with a zerk fitting...pump away! Careful though, if you're on the wrong cylinder, you bend the crank. If the piston is at BDC, you bend the crank.
If it HAS been sitting only three years, it should turn freely. Unless of course it was pulled from flood waters. It could have had a blown head gasket and then just parked. Who knows at this point. Pull the plugs and look down into the cylinders. There shouldn't be any rust. If there is, count on a major overhaul.
When buying a new engine, it is always a good idea to open her up and take a look to make sure all is normal internally. Pull the head, the hogshead and the bottom pan to be sure there are no broken pieces inside causing the problem, rather than just rust. If you are sure there is nothing else wrong with the engine, such as a broken magnet causing the transmission to jam, do all the above then position the crank at 8:00 and put a floor jack under the crank and jack the jack until there is substantial upward pressure on the crank and the car starts to lift slightly. Leave it there and the pressure should gradually cause the crank to start turning clockwise. When you come back, hopefully, the crank has moved up. If it has, jack the lever a little a little more, repeating the process until it eventually moves freely. That is if there is not some other problem. Jim
I have found a few times that it is a stuck valve and not the pistons. Put car in high gear and rock the car backwards then forward and see if you get any movement in the engine.
Probably not if it has been sitting for only a couple of years but a stuck valve or valves could also lock it up. Pull valve cover and check that too. I would bet rust on the rings and cylinder walls.
That'll work, Jim. A friend of mine bought five Farmall F-12 and F-20 tractors several years ago that all the engines were stuck. Filled the cylinders full of ATF diluted with kerosene and we backed them up to trees and put the transmissions in high gear. We used the end loader to lift the front of the tractors up and chained the rear wheels to the trees and left them there with the front wheels about 18-24" off the ground. This, of course, put constant pressure on the crank to turn. Nice thing about it is all you have to do is drive over and see if any have moved. After about a month, one tractor had went to the ground. A couple more weeks and another moved. Sometime about 3 months after putting them there (and hearing many comments about the wheelie-pullin tractors) we took the heads off the others and used a timber and 3 lb. sledge on the piston tops (with them still pulling wheelies). One more came loose like that. The other 2 tractors had to be torn down and the pistons broke out of them because they were just too corroded to do anything else.