Valve Seals and B-Series Engines, Magnette, MGA, MGB, MGB GT

O-ring valve seals have been used in MG series engines providing many years of service. Introduction of new materials and designs for valve components since the cars have left the assembly line offer an opportunity to upgrade the cylinder head.

The original designed use of the O-ring was as seal filling the inside bottom of the spring retainer cap. The early engines up through approximately the first four thousand MGB engines also used a oil deflector under the spring retainer cap. Oil is required to lubricate the valve stems and original equipment cast iron valve guides. The oil circulating in the engine cylinder head pumps through the rocker shaft. Oil splashed on top of the spring retainer cap was blocked by the O-ring from running down the valve stem into the valve guide. The original O-ring and oil deflector design allows a small amount of oil splashed through the valve springs to coat the valve stems and penetrate the clearance with the valve guides.

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My Classic MG

The MG is a British car that was founded by Cecil Kimber and manufactured from the 1920s through 1980 in Abingdon UK. The car name is taken from Morris Garage or MG.  MG featured saloons, coupes, and sports car models such as MGTA, MGTB, MGTC, MGTD, MGTF MGA, MGB, MGC, Midget, Magnette, and many more.  Today, MG is owned by China's Shanghai Automotive Industry Corporation (SAIC).

If you own a classic MG or are about to purchase one you will find that there is always something that needs cleaned, polished, tuned, repaired, or rebuilt.  Find MG information for maintenance, repairs, and restoration in our library.  Join our forum for lively discussions on any MG related topic.

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