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I have an older pickup that has been setting for a while. It has a factory rebuilt motor with low miles that has locked up from not being started. My question is- is there an easy way to break the pistons loose? I've heard fuel oil in the cylinders but am willing to try anything. Thanks.
Here is what I have done in the past. First disconnect battery. Pull plugs, get a hand pump oil can, fill with diesel fuel, put a generous amount in each cylinder. Let this sit overnight, go back and do it again. Do this for 4-5 days. Don't get in a hurry. Then get a socket that fits retaining nut for balancer on front of crankshaft. Using a breaker bar or long ratchet try turning it slightly. You will want to rock it back and forth just a little. If it breaks lose just rock it back and forth a few times. Don't rotate. Then go back with a squirt of fuel in each cylinder. Let sit for a little while then rock it a little more. If it starts to move easily just rotate back and forth in larger arc's until you can completely rotate crank. Keep luring cylinders and rotating until she is smooth. Then squirt some good clean oil into each cylinder and rotate to clean fuel off cylinders. Let sit overnight. Then drain oil and replace and new filter. Put plugs in and fire her up. This is what seems a slow process but it sure beats busting a ring. After you get it fired up run it for a while then change oil and filter again.
Marvels Mystery oil works good also....pull spark plugs and put in cylinders and then do like cray says.......after you get it broke loose spin motor over with starter and plugs out to blow out most of the oil.
Excellent answers. This is more specific than anything I have heard in the past. Hope I can get it freed up, it would be a shame to scrap a good chevy 350 with 60,000 on it.