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<p>Good info! Just how much harsher is engagement with the larger
accumulator? As one who always tries to shift as smoothly as
possible--without slipping the clutch much, if any--is engagement
so harsh as to require a slip of the clutch which, of course, will
contribute to clutch wear? If clutch isn't used, is engagement so
harsh as to be a 'shock' to the drivetrain; i.e. U-joints,
splines, differential gears?<br>
</p>
Bob<br>
<br>
<div class="moz-cite-prefix">On 8/9/2017 5:58 AM, Ed O'Neal wrote:<br>
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<blockquote type="cite"
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<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Mike,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">The
original OD design used a 1 ¾” accumulator piston with a
concentric double spring. This configuration was used in a
lot of different vehicles including the Triumphs. Donald
Healey didn’t like how the OD engaged harshly when the
clutch was not used during the shift. He changed the design
to incorporate a sleeve fitted in the 1 ¾” bore with a
smaller 1 1/8” accumulator piston inside of the sleeve and a
single spring. This gave a slower engagement much like a
modern automatic transmission. However, as the OD wears the
internal leakage increases and the OD will engage very
slowly or not at all. Using the larger accumulator is a
good idea (in my opinion) and will delay the point when
internal leakage causes a problem.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Ed<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><a
href="mailto:ed@wadsworthoneal.com" moz-do-not-send="true">ed@wadsworthoneal.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Edward
J. O’Neal, P.E., Pte.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Wadsworth
O’Neal Associates, Inc.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">6418
Commerce Park Drive<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">Fort
Myers, Florida 33966<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">phone:
(239) 245-8728<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">cell:
(239) 410-6174<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
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1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Healeys [<a class="moz-txt-link-freetext" href="mailto:healeys-bounces@autox.team.net">mailto:healeys-bounces@autox.team.net</a>]
<b>On Behalf Of </b>Michael MacLean<br>
<b>Sent:</b> Tuesday, August 08, 2017 8:47 PM<br>
<b>To:</b> Healey List<br>
<b>Subject:</b> [Healeys] Russ Thompson<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div id="yui_3_16_0_ym19_1_1502237499620_134651">
<p class="MsoNormal" style="background:white"><span
style="color:black"> Through a reference from the
list I am having Russ Thompson in Northridge, California
rebuild my BN2 transmission. It is a low mileage
(10,000 mi. approx) transmission, but I wanted to be
able to put it in and not have to take it back out
again. Good thing I took this precaution. Russ found
the overdrive stuck and would never have worked. Today
he showed me the accumulator piston. The smaller center
piston was scored from dirt or crap in the oil. Russ
replaced it with a one piece piston from a Triumph
overdrive. There was a huge spring below it. Anyone
heard of this? He said engagement will be real positive
now. Even with the low mileage, the number 2 synchro
was toast and will be replaced. The other two were fine
and will be re-used. All the gears showed very little
sign of wear. The reverse gear had some surface rust on
the teeth, but that can be blasted and it will be fine.
Getting closer to having the drive train is the car.<o:p></o:p></span></p>
</div>
<div id="yui_3_16_0_ym19_1_1502237499620_134884">
<p class="MsoNormal" style="background:white"><span
style="color:black"> I know I am going to start a
discussion, but Russ recommends using 40wt motor oil for
the transmission. Anyone know what weight Redline MTL
is?<o:p></o:p></span></p>
</div>
<div id="yui_3_16_0_ym19_1_1502237499620_134867">
<p class="MsoNormal" style="background:white"><span
style="color:black">Mike MacLean<o:p></o:p></span></p>
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