Quote:
28.4 a) Each driver may use no more than eight engines during a Championship season. Should a driver use more than eight engines he will drop ten places on the starting grid at the first Event during which each additional engine is used. If two such additional engines are used during a single Event the driver concerned will drop ten places on the starting grid at that Event and at the following Event.
An engine will be deemed to have been used once the car's timing transponder has shown that it has left the pit lane.
b) If a driver is replaced at any time during the Championship season his replacement will be deemed to be the original driver for the purposes of assessing engine usage.
c) After consultation with the relevant engine supplier the FIA will attach seals to each engine prior to it being used for the first time at an Event in order to ensure that no significant moving parts can be rebuilt or replaced.
Within two hours of the end of the post race parc ferme exhaust blanking plates (with one 10mm diameter inspection hole per cylinder) and further seals will be applied to all used engines in order to ensure that these engines cannot be run between Events. Upon request to the FIA these additional seals will be removed after the start of initial scrutineering at the next Event at which the engines are
required. All such engines must remain within the team's designated garage area when not fitted to a car and may not be started at any time during an Event other than when fitted to a car eligible to participate in the Event.
d) If any of the FIA seals are damaged or removed from an engine after it has been used for the first time that engine may not be used again unless they were removed under FIA supervision.
e) If an engine is changed in accordance with Article 34.1 the engine which was replaced may not be used during any future qualifying session or race with the exception of the last Event of the Championship.
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Does that help? I don't think the rules outline whether it can be rebuilt after its initial use, which leads me to believe it is allowed.