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Re: [TR] How smooth does the face of a block really need to be

To: David P <frogeye@porterscustom.com>, triumphs@autox.team.net
Subject: Re: [TR] How smooth does the face of a block really need to be
From: Paul Tegler <ptegler@verizon.net>
Date: Wed, 12 Dec 2018 21:59:47 -0500
Delivered-to: mharc@autox.team.net
Delivered-to: triumphs@autox.team.net
References: <CANLCLaG9pG-b4gxKem+4JBh4=w5B59fZkNgi=rdwMyPQnXTSqw@mail.gmail.com> <CANhzkeOCp5S6VyroAw-OU1L=nX8+R1H53i414jKjJP8JUqjAgA@mail.gmail.com> <CDF89095-EBA7-4951-8359-97DAE613A831@flash.net> <2052966149.18781.1544636315957@connect.xfinity.com> <a9218ae8-da18-3381-124b-86530e80f9f3@porterscustom.com>
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If your block has a lip...it's a different head gasket than with a flat 
block deck.

The recessed block head gasket actually has thicker rings embedded 
around the cyl bore, overhanging that recess.  GT6 did the same thing on 
later models. One gasket should have a tang that sticks out of the back 
of the head identifying the type (rings or not)

If you lay a straight edge on top the block,and can see light under the 
ruler when lit from behind....seriously consider a skim. Your cyls are 
less likely to blow, but the water ways and oil galleries can still be 
an issue if not VERY flat (and the head VERY flat)

ptegler

On 12/12/2018 5:09 PM, David P wrote:
>
> While on this general subject... the 250 and TR6 blocks have a ledge 
> machined into the top couple mm of each bore, presumably to allow a 
> bit of the head gasket to seep into this space. Does anyone have a 
> better explanation?
>
> Has anyone had this ledge removed by decking the block and if so were 
> there piston to head clearance issues?
>
> DaveP
>
> On 12/12/2018 10:38 AM, TERRY SMITH wrote:
>>
>> I'm probably in the minority here, but I measure the effort/expense 
>> of doing it 100% right, against the effort/expense of fixing it if it 
>> doesn't work.  If the block is already out, seems little effort and 
>> minimal money to have it skimmed at a machine shop, with the added 
>> advantage that they'll boil the block, thus cleaning any years' worth 
>> of crud out of the water channels, and check the block for cracks.  
>> Am I glad I did that?  Yes. When I took in the block that was 
>> original to the car for checking, the machinist found cracks where 
>> the liners sit. I'd have had to pull the engine and start over, 
>> assuming I hadn't ruined it altogether already.  Instead, I sourced a 
>> free block from a List member in CT, and was golden.
>>
>>
>> Your experience may vary and all that.
>>
>>
>> Terry Smith, '59 Tr3A  TS 58667
>>
>> New Hampshire
>>
>>
>>> On Mon, Dec 10, 2018, 12:58 PM Sujit Roy < triumphstag@gmail.com 
>>>
>>>     I've been at the block face of a Stag's engine with a Roloc.
>>>     (The block has been sitting in my garage for may years.)
>>>     I have noticed around the water channels some imperfections on
>>>     the surface. The rest of the block face is relatively OK.
>>>
>>>     Can I get away with not having the block face decked?
>>>
>>>     Sujit
>>>     -- 
>>>     Sujit Roy
>>>     Cupertino, California
>>>
>>>     https://triumphstagblog.wordpress.com/
>>>
>>>
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>>
>>
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>>
>>
>>
>> **triumphs@autox.team.net  **
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>> Unsubscribe/Manage:http://autox.team.net/mailman/options/triumphs/frogeye@porterscustom.com
> -- 
> Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My 
> World go here:WWW.PORTERBIKES.COM/
>
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-- 
Paul Tegler
ptegler@verizon.net  www.teglerizer.com


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    <p>If your block has a lip...it's a different head gasket than with
      a flat block deck.</p>
    <p>The recessed block head gasket actually has thicker rings
      embedded around the cyl bore, overhanging that recess.  GT6 did
      the same thing on later models. One gasket should have a tang that
      sticks out of the back of the head identifying the type (rings or
      not)</p>
    <p>If you lay a straight edge on top the block,and can see light
      under the ruler when lit from behind....seriously consider a skim.
      Your cyls are less likely to blow, but the water ways and oil
      galleries can still be an issue if not VERY flat (and the head
      VERY flat)</p>
    <p>ptegler<br>
    </p>
    <div class="moz-cite-prefix">On 12/12/2018 5:09 PM, David P wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:a9218ae8-da18-3381-124b-86530e80f9f3@porterscustom.com">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <p>While on this general subject... the 250 and TR6 blocks have a
        ledge machined into the top couple mm of each bore, presumably
        to allow a bit of the head gasket to seep into this space. Does
        anyone have a better explanation?</p>
      <p>Has anyone had this ledge removed by decking the block and if
        so were there piston to head clearance issues?</p>
      <p>DaveP<br>
      </p>
      <div class="moz-cite-prefix">On 12/12/2018 10:38 AM, TERRY SMITH
        wrote:<br>
      </div>
      <blockquote type="cite"
        cite="mid:2052966149.18781.1544636315957@connect.xfinity.com">
        <meta http-equiv="content-type" content="text/html;
          charset=UTF-8">
        <meta charset="UTF-8">
        <p style="font-size: 12pt; font-family: helvetica, arial,
          sans-serif; color: rgb(51, 51, 51);">I'm probably in the
          minority here, but I measure the effort/expense of doing it
          100% right, against the effort/expense of fixing it if it
          doesn't work.  If the block is already out, seems little
          effort and minimal money to have it skimmed at a machine shop,
          with the added advantage that they'll boil the block, thus
          cleaning any years' worth of crud out of the water channels,
          and check the block for cracks.  Am I glad I did that?  Yes. 
          When I took in the block that was original to the car for
          checking, the machinist found cracks where the liners sit. 
          I'd have had to pull the engine and start over, assuming I
          hadn't ruined it altogether already.  Instead, I sourced a
          free block from a List member in CT, and was golden.<br>
        </p>
        <p style="font-size: 12pt; font-family: helvetica, arial,
          sans-serif; color: rgb(51, 51, 51);"><br>
        </p>
        <p style="font-size: 12pt; font-family: helvetica, arial,
          sans-serif; color: rgb(51, 51, 51);">Your experience may vary
          and all that.<br>
        </p>
        <p style="font-size: 12pt; font-family: helvetica, arial,
          sans-serif; color: rgb(51, 51, 51);"><br>
        </p>
        <p style="font-size: 12pt; font-family: helvetica, arial,
          sans-serif; color: rgb(51, 51, 51);">Terry Smith, '59 Tr3A  TS
          58667<br>
        </p>
        <p style="font-size: 12pt; font-family: helvetica, arial,
          sans-serif; color: rgb(51, 51, 51);">New Hampshire<br>
        </p>
        <p style="font-size: 12pt; font-family: helvetica, arial,
          sans-serif; color: rgb(51, 51, 51);"><br>
        </p>
        <blockquote type="cite">
          <div>
            <div dir="ltr">
              <div class="ox-b488e11791-gmail_quote">
                <div dir="ltr">On Mon, Dec 10, 2018, 12:58 PM Sujit Roy
                  &lt; <a href="mailto:triumphstag@gmail.com";
                    moz-do-not-send="true">triumphstag@gmail.com</a>
                  wrote: <br>
                </div>
                <blockquote>
                  <div dir="ltr">
                    <div>
                      <div>I've been at the block face of a Stag's
                        engine with a Roloc. (The block has been sitting
                        in my garage for may years.)</div>
                      <div>I have noticed around the water channels some
                        imperfections on the surface. The rest of the
                        block face is relatively OK.</div>
                      <div><br>
                      </div>
                      <div>Can I get away with not having the block face
                        decked?</div>
                      <div><br>
                      </div>
                      <div>Sujit</div>
                      -- <br>
                      <div dir="ltr"
                        
class="ox-b488e11791-m_-2928778390541956300gmail_signature">
                        <div dir="ltr">
                          <div>Sujit Roy <br>
                            Cupertino, California</div>
                          <div><br>
                            <a
                              href="https://triumphstagblog.wordpress.com/";
                              target="_blank" rel="noopener"
                              
moz-do-not-send="true">https://triumphstagblog.wordpress.com/</a>
                            <br>
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                          </div>
                        </div>
                      </div>
                    </div>
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      <pre class="moz-signature" cols="72">-- 
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World 
go here: <a class="moz-txt-link-abbreviated" href="http://WWW.PORTERBIKES.COM/"; 
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Paul Tegler
<a class="moz-txt-link-abbreviated" 
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