[Fot] mechanical mystery

[Tim Murphy]

We cracked both #3 and #4 liners when we overheated due to the threaded end
of the water pump snapping off and ultimately throwing the belt off.  When
we took the head off there was water in the cylinders.  I'm thinking we may
have cracked the liners due to "hydraulic" pressure from trying to compress
the water that got into the cylinders.  Had similar cracks, vertical, down a
couple of inches.  As I recall, also scuffed at least #4 piston and maybe
#3.

Tim
1961 TR4 #317

-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of KENMUN at aol.com
Sent: Friday, July 17, 2009 2:01 PM
To: fot at autox.team.net
Subject: [Fot] mechanical mystery

fot, i'm in the process of disassembling my tr3 vintage racer motor to find 
 the source of water in the oil and overheating. so far i've found a crack 
in the  #4 liner (it goes from the top down about 1 1/2" ), the #4 piston 
has a slight  indentation in the top as if it has contacted the head, the 2 
compression rings  are broken and the piston is cracked in the area between 
the compression ring  groves. i think the cracked liner explains the water
in 
the oil and overheating  but, why did it crack? and how are the piston and 
ring problems related to the  liner crack? the motor is 87mm, 10.5/1 cr, 
liners up .005", steel head gasket,  and the motor had been running for
about 1 
yr. thanks for any ideas. ken  m.
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