What you are seeing is a ridge caused by the piston rings wearing the
cylinders up to that point. If you are lucky the ridge will only be thick
enough to catch a fingernail. If it is very deep you stand a chance to
break the rings when you take the pistons out. The more worn the cylinders
are, the larger the ridge. The ridge is formed because the rings don't go
all the way to the top of the cylinder. They do make ridge reamers for
those very worn engines as the ridge has to be cut away before you're able
to remove the pistons. The other option is to remove the piston from the
bottom then have the cylinder rebored as it will need it anyway.
Pete
-----Original Message-----
From: owner-triumphs@autox.team.net
[mailto:owner-triumphs@autox.team.net]On Behalf Of Dave1massey@cs.com
Sent: Saturday, November 12, 2005 7:38 PM
To: themoody5@msn.com; triumphs@autox.team.net
Subject: Re: head is off!
In a message dated 11/11/2005 9:33:55 PM Central Standard Time,
themoody5@msn.com writes:
> I have question
> about the clyinders in a TR6 block - are they lined? I ask because the
> metal around the cylinders - maybe a 1/16-3/32 or so is a slightly
different
>
> color than the rest of the block.
I think what you are seeing is the crimp of the head gasket. It is not
typical to sleeve a cast iron block unless it is a repair of a badly scored
cylinder in which case they woul line only the bad cylinder.
But I, too, have seen what you describe and I attributed that to the gasket.
Dave
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