Jim
Core sand and debris in the engine block is definitely one of the
causes. I also believe the stock radiator is just adequate for a stock
engine, any stress put to the system like added horsepower pushes the system
to inadequate very quickly.
There were a couple of large chunks of core material inside my 260
when I did a rebuild and it took some time to break them up and get them out
of the block. I still had some over heating issues when I ran the Tiger
but after flushing the cooling system and block out until very little core
sand was coming out, my Tiger ran normal.
Core sand will settle and collect in the radiator and the heater
core as it moves through the system. I highly recommend that anyone with
overheating issues to flush and back flush the heater core and the radiator
until they are clear.
Ron Fraser
-----Original Message-----
From: owner-tigers@autox.team.net [mailto:owner-tigers@autox.team.net] On
Behalf Of Rollright@aol.com
Sent: Tuesday, January 10, 2006 11:45 AM
To: tigers@autox.team.net
Subject: Blocked blocks
Subject: 260 Cobra overheating
Hey there sports fans!
In the Jan 2006 issue of Auto Restorer (letters section), a fellow that had
an "continually overheating" 260 Cobra finally overhauled the engine. When
he
removed the freeze/core plugs before sending the block to a machine shop for
a
complete cleaning, he picked at the rear plug hole and "...discovered
casting
wire, leftover casting sand, more junk than (he) could believe."
After removing lots of stuff left behind and sending it out for a
cleaning, the engine was reassembled and reinstalled.
All cooling problems solved, even on hot summer day. Letter from
Escondido, CA.
Well folks, what do you think? Anybody think this may be at the root of
our Tiger 260 cooling problems?
Jim Armstrong
rollright@aol.com
Mk1A #382002083
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