I feel slightly cheeky making my first post, cap in hand and looking for advice!
However I'm new to the T25 world so hope you'll be gentle on me.
The problem I have is as follows. I have a 1Y engine that I'm about to drop into my T25 van and while trying to lock up the camshaft to change the timing belt, the crankshaft will only turn through about 180 degrees and completely locks up either side.
I never saw the engine running but the bloke who sold it to me reckoned it was 100%.

Any thoughts? Would greatly appreciate any help.
Many thanks
John