thanks for the responses on my pistons in this 73 six, this detective story
is beginning to take shape. not to bore the list with a long triumph story, but
it's interesting detective work (to me anyways).
i bought this six from the original owner from texas a retired fighter pilot,
incredibly documented literally every receipt and more from the day he bought
it.
it was a failed restoration attempt by him, thousands worth of parts in
boxes, a "rebuilt engine" with a receipt of 4,000.00 plus 2,100.00 additional
work.
he stated it barely ran from the shop in texas adding to his painful decision
to part with her.
i was guessing improper cam timing gear replacement, (i did it myself on my
70 many years ago)so i'm at the point were it's time to get the rebuilt engine
painted to coincide with the chassis thats ready and the body which im about to
paint.
i knew to be sure i should take the engine apart and check out the "rebuilt"
engine. i found red texas ants in the intake manifold and intake chambers in
the head, ( i guess they didn't make the trip well to massachusetts last
winter).
new timing gears improperly timed (bingo),a chatter mark in #5 cylinder, oil
ring was not installed properly,new standard bearings (crank and rods)which
were scored from what looked like a dirty assembly.
then the piston question the x20 which i thought indicated oversize, but as
Bob Lang indicated each piston was punched with the letter A and as the manual
states on the block each cylinder was stamped with a corresponding A, so they
are original and so much for 4,000 dollar texas rebuild.
the original owner told me he had no luck with the shop standing behind his
rebuilt engine that wouldn't run, and the shop closed shortly after.
good news for texas triumph people.
so thats my triumph story!
thanks for the help!
p.s any recommendations for a good machinist in the boston capecod area.
cheers
Dan Clancy
1970 TR6
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