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MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGA - Radiator Cap

I have just ordered a new radiator cap from Moss only to find that it is too short and will therefore not pressurise the radiator.

The cap supplied has a label stating GRC101 on the box and marked as G490 on the cap itself. It has a reach of 1 inch which is exactly the same as the radiator throat, so it could never seal.

Barney Gaylord in the archive states that the original cap is 1 and one eighth inches in reach. Which seems right to me.

When I questioned Moss about this they said that they have been selling that product for years and nobody else had complained.

Further discussion with Moss technical support indicates that the correct cap is available from MiniSpares. The dimensions on their website indicates it should be correct but it has the exact same markings of GRC101 and G490. I have ordered one to check.

In the meantime I have mitigated the problem by adding some packing to reduce the length of the throat.

Has anybody else had this problem? Or am I missing something?

Thanks

Gordon
G Derham

It's an ongoing issue Gordon, compounded by some replacement radiators being fitted with the wrong length filler neck as well--

willy
William Revit

TR3 also has the deep throat,as has the mga twin cam
Dirk Van Ussel

This thread was discussed between 09/06/2021 and 10/06/2021

MG MGA index

This thread is from the archive. The Live MG MGA BBS is active now.