Motor has been sitting with spark plug out. I can turn crank by hand 3/4 of a turn then it locks. What can I do to break it free? Is it worth it? Dynamark mower in good shape. Sounds like it might have good rings when I turn it.
You have a rust ring - as suggested by John. You have a simple choice - you can strip the engine and clean the cylinder wall, or simply force it. This may break a piston ring, but what have you got to lose? It will probably be ok.
phil_saunders(a)bigfoot.com
Phil Saunders
April 2009
Either the cylinder has a rust ring thats causing the piston to lock up, or if its an OHV engine there may be a valve stuck open, and the piston is hitting that as it rises.
John
April 2009
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix lawn mowers.