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@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of KENMUN@aol.com
Sent: Friday, July 17, 2009 2:01 PM
To: fot@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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