I have an 86 auto trans that I purchased. It ran at the time, but I started to change the tub out, which ended up taking a year. Now, the starter engages but the engine won't turn over, load clunk! I even jumped the starter straight from the battery, same thing. Could the auto tranny cause the flywheel to lock and not turn? What could cause an engine not to turn over? Need a checklist of causes, excluding the starter itself, I know it's good, bought a brand new one to eliminate that possibility. Help!
Originally Posted by blubullett View Post
Hopefully it is just a bit of rust and it will spin free again.
80 CJ-5, 74 CJ-6, 56 CJ-5
^ like he said, I have seen rust do that on a few engines, if you try to turn it by hand, try turning it both ways. Do that and see what happens, they will usually be fine once they break free. It is also possible that the trans is locked up but very unlikely. I knew somebody that replaced their engine thinking it was locked up when it was the trans. Also another possibility is one of the accesories could be locked up, if the belts are good and not slipping something like an a/c compressor or water could be locked up, remove the belts and see what happens.
Thanks for the advice. I tried to remove the plugs and turn the motor by hand, still couldn't turn it. What is strange is a months ago it was doing the same thing when I first put it back together. I changed the solenoid ( I now believe I fried it do to the engine not turning). It ended up turning over, but was dragging. I ordered a msd ign and installed it. Tried to crank it and got a loud clunk. So I replaced the starter thinking it was the problem. Same loud clunk. It is definitely engaging at the fly wheel. It is strange how it turned over a few times a month ago but now won't. It's been in a garage.
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