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Re: Stanpart numbers for GT6

To: zoboherald@aol.com
Subject: Re: Stanpart numbers for GT6
From: Dave Fain <kc3565l@sprintmail.com>
Date: Tue, 15 Apr 2003 11:20:27 -0600 (MDT)
Cc: triumphs@autox.team.net
Andy:
I am pretty sure that pistons 1-5 are original equipment 
because they are numbered 1-5 in the proper place.  It 
looks like #6 is a standard size replacement, maybe due 
to a dropped valve or something.  It appears to be a very 
low mileage engine judging from the almost non existent 
ridge around the top of the cylinders.  I was thinking 
that somebody had done a funky repair, but now I think 
that I may get away with just replacing the rings instead 
of having to rebore and replace the pistons.  Maybe the 
R and S indicate the manufacturer who supplied the 
pistons?
Dave
 
>Can somebody help me identify these pistons?  I removed the
>head from my recently acquired GT6 project car and found, as
>expected, that it had a blown head gasket.  When I scraped
>the crud off the tops of the pistons, I found that 1-5 have
>Stanpart number 214947 S31 on them.  Number 6
>has 207045 R17.  That was also the cylinder that had the
>blown gasket so this is apparently not the first time this
>has happened.  Can somebody tell me how far #6 has been
>overbored from that part number?  The engine is an early
>GT6+ block (KD53420E).  Looks like it's time for some
>serious machine work and new pistons.


I'd first replied to Dave that: "TRF came up with one match [out of two]. 
According to [their online catalog], 207045 is a "Piston, Bare" and is no 
longer stocked. I'm not sure what a bare piston is, except that perhaps it was 
supplied without rings? Still leaves me wondering about the other five pistons, 
though...."

But then I remembered that I had an early GT6 engine -- KC4213E -- with the 
head off, all stuffed in the barn.Sure enough, I hit paydirt (well, actually I 
scraped dirt off the tops of a couple pistons). This was a very low mileage 
engine out of a wreck many, many years ago. But I digress. Pistons 1 & 6 
carried the Stanpart logo and the number 207045. One had below it "R6" and the 
other "R8" -- for whatever that's worth.

So perhaps the 214947 pistons in cylinders 1-5 are original "Pistons, Bare" 
used in the factory assembly of that later engine, and the 207045 came out of a 
dealer's stock to replace a problem piston in cylinder 6? What's confusing is 
that part numbers in the factory Spare Parts Catalogues appear to be for a 
"piston assembly" (p/n 139809 for early GT6 engines and 149976 for later 
engines) that presumably includes rings and the wrist pin w/clips, whereas the 
Stanpart number on the top of the piston is literally the (unlisted) part 
number for just the cast piston itself.

Anyone got the head off an original GT6+ or Mk2 engine to possibly confirm that 
214947 is an original piston for same?

--Andy Mace

*Mrs Irrelevant: Oh, is it a jet?
*Man: Well, no ... It's not so much of a jet, it's more your, er,
?Triumph Herald engine with wings.
? ?-- Cut-price Airlines Sketch, Monty Python's Flying Circus (22) 

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