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<DIV>Question? How will the modeling clay get into place without disassembling
the motor? And how will it come out without distorting its shape and size? The
fastest way I can think to measure piston to valve clearance is to set the
piston at top dead center, then remove the valve spring. With a fixed dial
indicator measure the travel distance from the valve pulled up tight against the
seat then moving it downward until it touches the piston. A light weight spring
in picture #3 makes that safer. Compare that distance with the rating of
your cam lift (factoring the rocker ratio IF not stock). DO NOT ROTATE THE
ENGINE IN THIS SITUATION if you don’t use the light weight spring! Make sure the
regular springs are reinstalled before rotation. Picture #3 shows the process
but uses the mentioned very light weight spring. That is best as it will prevent
the valve from dropping though I have gone without it in a pinch. But in either
case you will know exactly how far it is from the valve being seated until it
hits the piston at TDC.</DIV>
<DIV> </DIV>
<DIV>In most cases the valve should not drop too far into the guide that the
stem still can’t be touched. I have used rubber bands to hold the valve up while
reinstalling the springs and then use a curved pick to break it and remove the
broken band with tweezers. There are numerous tools available to remove the
valves spring. I’d use the type in picture #1 as it avoids solely pushing the
valve downward (if the locks hold) and that could cause the valve to move the
piston (picture #2 No!) which as stated above is something you don’t want to
do.</DIV>
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<DIV>It might be helpful if we know the reason why you suspect the clearance is
an issue. Cam lift, rocker ratio, deck height, piston surface to wrist pin
height and gasket thickness are all factors.</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> Tuesday, January 23, 2018 5:51 PM</DIV>
<DIV><B>To:</B> <A title=tigers@autox.team.net
href="mailto:tigers@autox.team.net">Tiger's List</A> </DIV>
<DIV><B>Subject:</B> [Tigers] Tiger's 289 Piston to Valve Clearance Check
Mistake</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">If approximately a 1
sq. in. small flat of modelling clay is placed (not near the piston's periphery)
where it is in the squish area of the piston instead of only under the head's
combustion pocket, can rotating the assembled piston and rod cause the piston to
cant in the cylinder bore enough to crack a piston skirt?</DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">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
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif"> </DIV>
<DIV class=gmail_default
style="FONT-SIZE: small; FONT-FAMILY: verdana,sans-serif">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>
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