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I doubt that your .030 squish would cause the rattling as you describe. =
The deflection caused by the crank, rod and piston in order to hit the =
head at .030 would be way up in the rpm=E2=80=99s like 8000!
=20
Did the rattling go away after all the parts warmed up and oil was well =
disbursed or is it still rattling? My first guess would be either the =
engine was not pre-oiled or you have loose piston pin bushings=E2=80=A6. =
Were the rods rebuilt with new bushings fitted to about .0003? =20
=20
Steve Yott
=20
From: Fot [mailto:fot-bounces@autox.team.net] On Behalf Of Robert Lang
Sent: Wednesday, May 25, 2016 11:29 AM
To: FOT List
Subject: Re: [Fot] TR6 Piston / Head Clearance
=20
Hi,
=20
Where I was going with the query was this: I had a late block "decked" =
with the intent of making the deck flat. The machinist took of .032 to =
accomplish the goal. With a head gasket installed and the head torqued, =
the clearance in the squish area is .030.
I had initially wanted only about .025 removed, but we had to shave an =
extra .007 to get rid of the fire ring cuts.
On initial startup, the motor sounded like it might be "rattling" and =
I'm trying to figure out why.
When I used a stethescope on the block, everything sounds okay - no =
rapping and the valve train sounds "normal" and there were no weird =
sounds coming from the crank.
I guess where I'm going with this is: if piston / head clearance is too =
tight, I'll see some sort of indication on the piston, right?
TIA for any sage advice.
This is my first experience "decking" a block. I'd like to get it right, =
I don't have the resources to start a new block from scratch.
Regards,
Bob Lang
=20
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<div class=3DSection1>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I doubt that your .030 squish would cause the rattling as =
you
describe.=C2=A0 The deflection caused by the crank, rod and piston in =
order to hit
the head at .030 would be way up in the rpm=E2=80=99s like =
8000!<o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Did the rattling go away after all the parts warmed up =
and oil
was well disbursed or is it still rattling?=C2=A0 My first guess would =
be either the
engine was not pre-oiled or you have loose piston pin =
bushings=E2=80=A6.=C2=A0 Were the rods
rebuilt with new bushings fitted to about .0003?=C2=A0 =
<o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Steve Yott<o:p></o:p></span></p>
<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'>
<p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Fot
[mailto:fot-bounces@autox.team.net] <b>On Behalf Of </b>Robert Lang<br>
<b>Sent:</b> Wednesday, May 25, 2016 11:29 AM<br>
<b>To:</b> FOT List<br>
<b>Subject:</b> Re: [Fot] TR6 Piston / Head =
Clearance<o:p></o:p></span></p>
</div>
</div>
<p class=3DMsoNormal><o:p> </o:p></p>
<div>
<div>
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'>Hi,<o:p></o:p></span></p>
</div>
<div id=3D"yui_3_16_0_ym19_1_1464192999183_4039">
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'><o:p> </o:p></span></p>
</div>
<div id=3D"yui_3_16_0_ym19_1_1464192999183_4040">
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'>Where I was going with the query was this: I had a late =
block
"decked" with the intent of making the deck flat. The =
machinist took
of .032 to accomplish the goal. With a head gasket installed and the =
head
torqued, the clearance in the squish area is .030.<o:p></o:p></span></p>
</div>
<div id=3D"yui_3_16_0_ym19_1_1464192999183_4041">
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'>I had initially wanted only about .025 removed, but we had =
to
shave an extra .007 to get rid of the fire ring =
cuts.<o:p></o:p></span></p>
</div>
<div id=3D"yui_3_16_0_ym19_1_1464192999183_4042">
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'>On initial startup, the motor sounded like it might be
"rattling" and I'm trying to figure out =
why.<o:p></o:p></span></p>
</div>
<div id=3D"yui_3_16_0_ym19_1_1464192999183_4043">
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'>When I used a stethescope on the block, everything sounds =
okay -
no rapping and the valve train sounds "normal" and there were =
no
weird sounds coming from the crank.<o:p></o:p></span></p>
</div>
<div id=3D"yui_3_16_0_ym19_1_1464192999183_4055">
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'>I guess where I'm going with this is: if piston / head =
clearance
is too tight, I'll see some sort of indication on the piston, =
right?<o:p></o:p></span></p>
</div>
<div id=3D"yui_3_16_0_ym19_1_1464192999183_4056">
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'>TIA for any sage advice.<o:p></o:p></span></p>
</div>
<div>
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'>This is my first experience "decking" a block. =
I'd like
to get it right, I don't have the resources to start a new block from =
scratch.<o:p></o:p></span></p>
</div>
<div>
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'>Regards,<o:p></o:p></span></p>
</div>
<div>
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'>Bob Lang<o:p></o:p></span></p>
</div>
<div id=3D"yui_3_16_0_ym19_1_1464192999183_3788">
<p class=3DMsoNormal style=3D'background:white'><span =
style=3D'font-family:"Helvetica","sans-serif";
color:black'><o:p> </o:p></span></p>
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