<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div>Rob... I don't read my email daily so I just read your post. The noise you heard ... the first thing that came to my mind was the timing chan. Have no knowledge of when it was last replaced etc. this is obvious a guess BUT since you are turning the crank nut the first 3 places a noise MIGHT emulate from is the bolt/washer or the pulley itself a and then the gears/timing chain. I agree with others reply, the clay would hardly create any problem. When you figure it out, be sure to post your findings so others may benifit. Good luck. TonytheTiger in southern IL. <br></div><div><br></div><div class="ydp147524c7signature"><div>Tony Lang (TtT)<var id="ydp147524c7yui-ie-cursor"></var></div></div></div>
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On Wednesday, January 24, 2018 12:53:19 PM CST, Rob Hogan via Tigers <tigers@autox.team.net> wrote:
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<div><div id="ydp16e1a136yiv7694431141"><div><div dir="ltr"><div class="ydp16e1a136yiv7694431141gmail_default" style="font-family:verdana, sans-serif;font-size:small;">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="ydp16e1a136yiv7694431141gmail_default" style="font-family:verdana, sans-serif;font-size:small;">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="ydp16e1a136yiv7694431141gmail_extra"><br clear="none"><div class="ydp16e1a136yiv7694431141gmail_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" rel="nofollow" shape="rect">tigers@autox.team.net</a>></span> wrote:<br clear="none"><blockquote class="ydp16e1a136yiv7694431141gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="ydp16e1a136yiv7694431141yqt8039746447" id="ydp16e1a136yiv7694431141yqt59890"><div><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><br clear="none"></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 clear="none"><br clear="none"><br clear="none">Begin forwarded message:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><b>From:</b> Tom Witt via Tigers <<a href="mailto:tigers@autox.team.net" target="_blank" rel="nofollow" shape="rect">tigers@autox.team.net</a>><br clear="none"><b>Date:</b> January 23, 2018 at 11:58:45 PM PST<br clear="none"><b>To:</b> "Tiger's List" <<a href="mailto:tigers@autox.team.net" target="_blank" rel="nofollow" shape="rect">tigers@autox.team.net</a>><br clear="none"><b>Subject:</b> <b>Re: [Tigers] Restated: Mistake in Performing Tiger's Valve ClearanceCheck</b><br clear="none"><b>Reply-To:</b> Tom Witt <<a href="mailto:atwittsend@verizon.net" target="_blank" rel="nofollow" shape="rect">atwittsend@verizon.net</a>><br clear="none"><br clear="none"></div></blockquote><blockquote type="cite"><div>
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</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" rel="nofollow" shape="rect">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" rel="nofollow" shape="rect">Tiger's List</a> </div>
<div><b>Subject:</b> [Tigers] Restated: Mistake in Performing Tiger's Valve
ClearanceCheck</div></div></div>
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<div class="ydp16e1a136yiv7694431141gmail_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>
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<div class="ydp16e1a136yiv7694431141gmail_default">Is there any other potential weak area that could be
cracked by piston to head interference with clay in between?</div>
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<div class="ydp16e1a136yiv7694431141gmail_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>
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