Unlike the TR3 and TR4 motor, the TR6 has no liners. The piston holes
are bored direct into the iron lump. If your machinist is any good, he
should be able to tell you whether the block needs bored or can get by
with a honing. If you have only pinholes in the cylinder wall, and no
ledge up top, I would think you would be all right, as the pinholes
would soon fill with carbon and gunk up to the level of the rest of the
wall.
Cheers,
Bill
Chad Jester wrote:
>List,
>
>I'm reworking a TR6 motor....have found that 4 of the 6 bores will easily be
>able to remain standard. Two of the bores have some pits around the area
>where the rings were (car was stored for 14+ years). Anyhow.....wondering if
>any of you have replaced just the liners rather than reboring the block? I'd
>like some feedback on the +/- of doing it that way. The workshop manual says
>the biggest overbore allowed is + .020", but BPNW and others sell piston /
>ring sets up to + .060".
>
>What do you suggest? At this point, I'm inclined to just replace the two
>liners that need it, hone the other cylinders, and install new rings. I'll
>also install new bearing shells (including thrust), and do a valve job. The
>car has pretty low original miles, there isn't even a ring wear groove in the
>unaffected cylinders.
>
>TIA!
>
>Chad
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