Tech Topics

The New England M.G. ‘T’ Register has a long history of providing its members with advice and technical expertise on the restoration and maintenance of our special cars. We present some of our favorite technical articles and tips here for members and visitors alike.


Oil Pump Seal Gaskets for Late TD/TF

The question of which rubber oil filter gasket to use in the late TD/ TF oil pump filter requires a bit more detail. I have no idea which gasket Moss supplies or how thick/thin they are. However, I have checked gasket thicknesses (measured across the diameter) as supplied with both a UAP/NAPA 51300 filter and Fram CH814PL filter. Three gaskets are supplied from each supplier, the thin one is 0.068" wide, the medium one is 0.088" and the thick one is 0.119".

Now the slot/groove where the gasket fits in the oil pump measures 0.095" wide (all measurements may not be exact to the nearest thou. but are close enough). So the correct gasket to use is the 0.088", or in the case of these two suppliers the medium one. The gasket must be seated and fit completely in the pump groove. Oil the gasket and carefully work it around into the groove till it is fully seated. Not the easiest job on the car!

The thin gasket is easier to fit in the groove but the oil canister may not trap it fully and so a leak can occur. The thick gasket will not enter the groove and hence may not seal properly.

In any case, never use more than one gasket. These gaskets age, harden and become brittle. Although it is not necessary to replace the gasket with each filter change, it is a good idea to change them if they become hard and brittle. Use of an adapter to accept a modern spin on filter means you do not disturb the gasket each time you replace the filter. Also a spin-on costs less money than the cartridge and is easier to change.
by Bob Grunau #204



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