[TR] TR4 - broken piston liner

[LBC.Resto]

I did the same dumb thing when bringing mine "out of the barn".  I had
replaced the rings and big end bearings and then it happened.  I didn't know
how the engine was going to hold up anyway, so I decided to risk it.  3
years and 6,000 miles later it is still going.  I know that it might go
bang, but I have a spare engine that I will be building up for later.

Just this reporter's experience.

--
Ian
62 TR4


-----Original Message-----
From: triumphs-bounces at autox.team.net
[mailto:triumphs-bounces at autox.team.net] On Behalf Of Lee&John Howard
Sent: Thursday, October 22, 2009 4:34 PM
To: triumph list list
Subject: [TR] TR4 - broken piston liner

My dumbest move yet - and that's saying a lot.

Some may remember that when investigating my engine bang, I discovered a
burr on the connecting rod bearing seat on the crankshaft, which had ground
a groove in the bearing.  I did my best to remove the burr with emery cloth
and fine sandpaper, and buttoned up the engine. Today I decided to fine tune
my repair, and having detached the rod from the crank I asked my partner to
bump the engine around so I could get at the bad spot on the crank. To my
horror the rod got stuck on the wrong side of the crank, jammed into the
piston liner, and broke off a crescent shaped piece of liner about 1 1/2
inches long, where it protrudes from the bottom of the cylinder bore!

So, my obvious question is, can I drive it this way? The piston does enter
the broken area at the bottom of its stroke, but all the compression is way
above, of course. I don't expect the liner is cracked upwards above the
break, but who knows? I think its impossible top buy just one liner although
I might come across a used set, I suppose.  What further damage might I
incur by not replacing the liner?

As always, thank you for your help.

John Howard
64 TR4
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