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<DIV>Is the engine on a stand, or in the car? If on a stand you can pull the oil
pan. In fact on the Tiger it isn’t even too hard to do in the car. Is it
possible..., (short story) years ago I remember a guy telling us about a
collective neighborhood rebuild on a guys car. When they went to start it
the engine wouldn’t turn over. Eventually the engine was torn down only to find
a block of wood used to prevent crank rotation when tightening bolts had been
left inside. And when you say you heard a “crack” sound ... well ... .
BTW, assembly lube is more than sufficient to handle an engine being turned over
by hand.</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=tigers@autox.team.net
href="mailto:tigers@autox.team.net">Rob Hogan via Tigers</A> </DIV>
<DIV><B>Sent:</B> Wednesday, January 24, 2018 10:12 AM</DIV>
<DIV><B>To:</B> <A title=jay.laifman@gmail.com
href="mailto:jay.laifman@gmail.com">Jay Laifman</A> </DIV>
<DIV><B>Cc:</B> <A title=tigers@autox.team.net
href="mailto:tigers@autox.team.net">Tiger's Den</A> </DIV>
<DIV><B>Subject:</B> Re: [Tigers] Fwd: Restated: Mistake in Performing Tiger's
ValveClearanceCheck</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">I'm asking because as
I turned the engine toward #1 TDC with a breaker bar & socket on the front
damper bolt, I heard a distinct sound that was like something cracked. The
source area was indeterminate. There was a resistance to continuing with
the rotation, but I didn't judge it as a reason to stop. Applied torque
was probably less than 30 ft. Lbs. I dismissed the event as not important until
the head was removed to check the valve impressions in the clay. The sound could
have been generated be a number of things, rod, bearings, piston rings,
etc. Among potential sources, I have no idea of how resistant to damage a
rod bearing position tab is when the parts are only assembly lubed.</DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">I probably should
defer to being safe and disassemble the #1 R&P from the block for visual
& magnaflux inspection or not and take the risk and run the engine as
is.</DIV></DIV>
<DIV class=gmail_extra>
<DIV> </DIV>
<DIV class=gmail_quote>On Wed, Jan 24, 2018 at 9:37 AM, Jay Laifman via Tigers
<SPAN dir=ltr><<A href="mailto:tigers@autox.team.net"
target=_blank>tigers@autox.team.net</A>></SPAN> wrote:<BR>
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style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
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<DIV></DIV>
<DIV>I’m confused. Why are you asking? It sounds like you think
you have cracks in the pistons because you used clay before and you are
considering taking apart the engine. But you are not sure you have
cracks, so you are asking about the clay. </DIV>
<DIV> </DIV>
<DIV>If that is true, perhaps the first question to be considered is why do
you think you have cracks? And if you have them, it would seem
irrelevant whether or not the clay was the cause.<BR><BR><BR>Begin forwarded
message:<BR><BR></DIV>
<BLOCKQUOTE type="cite">
<DIV><B>From:</B> Tom Witt via Tigers <<A
href="mailto:tigers@autox.team.net"
target=_blank>tigers@autox.team.net</A>><BR><B>Date:</B> January 23, 2018
at 11:58:45 PM PST<BR><B>To:</B> "Tiger's List" <<A
href="mailto:tigers@autox.team.net"
target=_blank>tigers@autox.team.net</A>><BR><B>Subject:</B> <B>Re:
[Tigers] Restated: Mistake in Performing Tiger's Valve
ClearanceCheck</B><BR><B>Reply-To:</B> Tom Witt <<A
href="mailto:atwittsend@verizon.net"
target=_blank>atwittsend@verizon.net</A>><BR><BR></DIV></BLOCKQUOTE>
<BLOCKQUOTE type="cite">
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000"><SPAN>
<DIV>1 cubic inch is 16.4 CC’s. The combustion chamber is at least 49cc’s
and likely larger towards 54cc’s (or more, I don’t have my combustion
chamber numbers floating off the top of my head). The clay is pliable and
would only squeeze into a void area of which there is at least three times
its volume in space. And think of it this way, the cylinder pressure is
upward of 150 PSI - and that is even before ignition. My guess it is
HIGHLY improbable that the clay being offset would cause a piston skirt to
crack. Push a piece of clay under your finger and see that the finger
doesn’t bottom out on the surface it is pushed onto with virtually no clay
underneath.</DIV>
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<DIV><B>From:</B> <A title=tigers@autox.team.net
href="mailto:tigers@autox.team.net" target=_blank>Rob Hogan via Tigers</A>
</DIV>
<DIV><B>Sent:</B> Tuesday, January 23, 2018 9:17 PM</DIV>
<DIV><B>To:</B> <A title=tigers@autox.team.net
href="mailto:tigers@autox.team.net" target=_blank>Tiger's List</A> </DIV>
<DIV><B>Subject:</B> [Tigers] Restated: Mistake in Performing Tiger's Valve
ClearanceCheck</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">
<DIV class=gmail_default>BECAUSE approximately a 1 sq. in. small flat of
modelling clay was placed (not near the piston's periphery) in the squish
area of the piston instead of only under the head's combustion pocket, would
the assembled piston and rod's rotation have caused the piston to cant in
the cylinder bore enough to crack a piston skirt?</DIV>
<DIV class=gmail_default> </DIV>
<DIV class=gmail_default>Is there any other potential weak area that could
be cracked by piston to head interference with clay in between?</DIV>
<DIV class=gmail_default> </DIV>
<DIV class=gmail_default>I hesitate to disassemble the engine to search for
possible part cracking if the clay interference is really incapable of
causing something to crack.</DIV></DIV></DIV>
<DIV id=m_368579557340365673DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2><BR>
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