[TR] TR6 Oil Plug washer

Randall tr3driver at ca.rr.com
Tue May 19 11:22:29 MDT 2009


> Interesting. I didn't even think about the possible 
> difference between Bud's TR6 and my '3A. That said, I just 
> took a look at mine and while the sump that's on the engine 
> has a steel pipe threaded plug, it also has a copper washer 
> (just as I remembered from my first '3A back in the 60's).

TR2-TR3 did have a hex head plug with straight threads and a (fiber) washer;
but shortly before the introduction of the TR3A (engine 18902E) it was
changed to a square-head pipe plug without washer.  (The threads in the pan
changed as well.)  Since the head of the later plug was smaller than the
threads, there wasn't any place to add a washer.  Here's a photo from the
TR4 factory manual:
http://tinyurl.com/ove7o4

AFAIK, that remained the arrangement through the end of the TR6 run.  I only
have early TR6 factory documentation (that shows the same plug), but I don't
see any change mentioned in the Moss catalog or Haynes manual.

But of course that pipe plug is a common trouble spot; the small square head
frequently gets rounded off and so owners are likely to install alternate
plugs (as I do).  The magnetic plugs sold by Moss, TRF, et al have larger
hex heads (and were apparently stock on Stag gearbox drain plugs).

Randall


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