Got the jeep out ready to take for its MOT. Put in new points, condenser, plugs and rotor arm. Took it up the road and had a problem with a dried out washer on top of the filter letting in air, replaced and set off for the MOT.
After about 6 miles the engine just cut out, not fuel as the engine stopped instantly, the vehicle coasted in gear to the side of the road and I got out to investigate.
Spark at the plugs but wouldn't run so took it home to work on it.
Opened the timing cover under the starter and set it on IGN. Checked the distributor and the rotor arm was out. The rotor arm was pointing at cylinder 3.
Looking at this and G503 forum the concensus of various messages was that the timing chain had slipped/jumped and thrown the timing out.
I took the front off and radiator out and put the jeep into gear to enable the large centre nut on the crank to be undone- this where it begins to get weird. The crank turns even though it is in first low with the brakes on. The rotor turns and the flywheel turns.
However when I push the jeep while it is in gear it does not turn the engine over it seems locked and yet it had no problem rolling when it coasted to a stop earlier in the day.
Any ideas please !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!