[TR] TR 3 A REAR ENGINE SEAL

[Robin Watson]

I am now getting ready to rebuild a TR 3 A engine, I have worked on autos
and motorcycles with my Dad from 1945 at the age of 11 till I was 21 when I
went over to being a foundry engineer with a UK company BMM. I have worked
on MG’s in the USA for the last 20 years and now have a 1960 TR3 that when
I first saw one in the UK while working at the original Blue Boar garage at
the junction of the Leamington to Rugby road and the A45 Dunchurch I
thought this was the car for me. I have never worked on a metal oil seal
before but have read what I think is about all the details on this but
still have one question I need answering. I feel that the oil that may try
to get out is returned into the sump by a groove cut like a thread into the
crank shaft, which sounds like a good idea. What I don’t understand for
sure is when you set up the seal with a mandrill they say to coat the seal
with shellac but I feel they mean to coat the metal faces of the seal that
bolt up to the block and the bottom bearing cap to make a seal between two
metal surfaces (especially as the shellac is a very thin liquid) , I cannot
see any reason for coating the part of the seal that mounts up to the
mandrill just before you remove the bearing cap after tightening the seal
bolts. Hope you can put me right with this. Thanks Robin
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