strange seized engine problem, needing help

[Karu]

A mate has a 2000 build Holden Rodeo manual 2.2litre petrol with 171,000km. It was parked in a garage 18 months ago and it ran perfectly. When it wasto be driven out the engine was locked. By putting a socket on the pulley it turns back and forth slightly (the camshaft moves a half an inch either direction before a clunk some where in the rear of the engine stops it.) The timing belt is good, the spark plugs are good, number 1 and number 4 are in tdc position while 2 and 3 are down south. The starter has been removed without success and the ute rolls in neutral.
Any ideas?

[koan]

Any ideas?

No but it sounds very much like my mate's P76 which had seized engine which turned out to be a small bolt jammed in between piston and cylinder wall.

koan

[Big_Richard]

there may just be rust on the cylinder walls,

have you tried supplying a healthy amount of CRC down the spark plug holes and leaving it overnight ?

If the car had a leaking head gasket when it was parked the engine is more than likely severely damaged by now.