http://www.formula1.com/inside_f1/rules_and_regulations/technical_regulations/8699/fia.html said:
5.20 Replacing engine parts:
The parts in lists A and B below may be changed without incurring a penalty under Article 28.4 of the F1 Sporting Regulations. If changing any of these parts involves breaking a seal this may be done but must carried out under FIA supervision. The parts in List B may only be replaced by identical homologated parts in accordance with Appendix 4 of the F1 Sporting Regulations.
List A
- Clutch
- Clutch basket
- Hydraulic pumps
- Engine electronic boxes (ECU's, power modules, control boxes)
- Fuel filters
- Fuel pumps
- Oil filters
- Oil tank systems
- Pneumatic bottles, regulators, pumps and pipes for valve actuation
- Exhaust systems
- Supports and brackets related to the auxiliaries, mentioned above
- Screws, nuts, dowels or washers related to the auxiliaries, mentioned above
- Cables, tubes or hoses related to the auxiliaries, mentioned above
- Oil or air seals related to the auxiliaries, mentioned above
- Spark plugs
List B
- Throttle system (including but not limited to throttle device, linkage, actuator, hydraulics)
- Intake system external to cylinder head (including but not limited to trumpets, trumpet tray, air box, air filter)
- Ignition coils
- Injection system
- Alternators
- Oil scavenging pumps
- Oil supply pumps
- Oil air separators
- Water pumps
- Electric and electronic sensors