Triumph Spitfire Rocker Cover and Fittings
Special Note:- Mk3 Oil Filler Cap, Closed Circuit Engine Breather System
The original 2 piece oil filler cap (part no. 143393) which prevented a vacuum by allowing air into the engine is no longer available. As an alternative, GZC1400 can be used with the following modifications:-
Remove the rubber seal from the cap.
Alternatively, retain the seal (which prevents the cap from rattling) and drill a 1/16" hole in the cap, off centre to avoid the rivetted centre plate.