"Restoration has been delayed due to cracks found in the chassis in late June, " an NRM spokesman said.
BBC: Flying Scotsman
Once the work is completed, Flying Scotsman "will be able to run for decades to come", the NRM said.
The restoration of the Flying Scotsman is unlikely to be completed before 2015, the National Railway Museum (NRM) has confirmed.
BBC: Flying Scotsman engine restoration delayed again
Flying Scotsman is now expected to be tested in the autumn and go on display later this year, the NRM said.
Since then it has been undergoing major restoration work at the National Railway Museum (NRM) in York where it is going on public display.
BBC: Flying Scotsman on show at National Railway Museum
The return of the restored Flying Scotsman to the National Railway Museum (NRM) in York has been delayed after cracks were found in its chassis.
The NRM said there was also a small section of the main side frames that could not be examined until the steam cylinders are removed.
It had been expected the engine would be running in time to participate in last year's Olympic torch relay but the NRM was forced to withdraw it.
The NRM said that after a thorough examination to identify the extent of the problem, it was established that the locomotive required essential remedial work, which would be carried out in the next two weeks.
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