Hand Prop

[Roger]

My 337-H has been sitting in the hanger for 3 months while I have been away, and today I attemtped to start it (I know Mom).

I plugged in the oil / block heaters overnight to thin the oil, and then hand propped the front engine backwards several times and then lit it up. I then tried to do the same to the rear and it was "locked up" . I could prop it forwards, but not backwards.

When hand propping it forward it makes a miltiple click at one location on every revolution. I then ran it a few revs with the starter (no fuel) and it turned over fine, but again it would not turn backwards by hand.

What would casue this lock up, but only one way? Normally aspirated IO-360.

Any thoughts ? tks/Roger