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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>That’s the one I’ve got. I did get an increase in pressure. No question about that.<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>I talked to Dave at OD Spares with regard to the various accumulators out there at the moment. I don’t recall exactly but he supplies all of them to his customers and, I think, to the suppliers.<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Simon<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US>From:</span></b><span lang=EN-US> Healeys <healeys-bounces@autox.team.net> <b>On Behalf Of </b>Bob Spidell<br><b>Sent:</b> 17 April 2022 23:06<br><b>To:</b> Michael Salter <michaelsalter@gmail.com><br><b>Cc:</b> healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] Overdrive pressure not releasing.<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>AH Spares has an accumulator and piston which uses an O-ring. It appears the pressure relief hole is chamfered:<br><br><a href="https://www.ahspares.co.uk/austin-healey/performance-parts/gearbox-overdrive/o-ring-conversion-accumulator-piston.aspx">https://www.ahspares.co.uk/austin-healey/performance-parts/gearbox-overdrive/o-ring-conversion-accumulator-piston.aspx</a><br><br><o:p></o:p></p><div><p class=MsoNormal>On 4/17/2022 12:03 PM, Michael Salter wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>Actually Bob I've never used an "O" ringed accumulator. <o:p></o:p></p><div><p class=MsoNormal>I spent a little time many years back looking into using "O" rings on the accumulator but couldn't resolve the issue of the ring being chaffed when passing over the radial drillings in the accumulator body. <o:p></o:p></p></div><div><p class=MsoNormal>Does anyone know how that has been solved?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>M<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Sun., Apr. 17, 2022, 2:49 p.m. Bob Spidell, <<a href="mailto:bspidell@comcast.net">bspidell@comcast.net</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><p class=MsoNormal style='margin-bottom:12.0pt'>Michael, <br><br>Sounds like you're implying the O-ringed accumulator is superior to the metal ring (OEM) type? Wish I'd known about it when I rebuilt my O/D (I bought the DWM 'uprated' accumulator).<br><br>I'll throw out another, very unlikely, potential cause: the cone clutch could be stuck together. I've heard of this happening, but have never experienced it my self--nor has anyone I know--but it's theoretically possible (esp. if the clutch is excessively worn). Could this be the reason the manual is adamant about replacing the 8 strong springs, of two lengths, that oppose the operating pistons on overhaul, regardless if they still seem robust?<br><br><o:p></o:p></p><div><p class=MsoNormal>On 4/17/2022 9:31 AM, Michael Salter via Healeys wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>Simon,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>Based upon your synopsis I conclude that the operating valve is NOT opening when either the solenoid lever or the setting lever is being moved to the position where the operating valve ball would normally be lifted off its seat.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>This conclusion is based upon your discovery that the pressure in the accumulator, as indicated on the gauge, does not leak away overnight.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>There is a small clearance between the operating valve push rod and the overdrive housing. If the operating valve ball was indeed lifted off its seat all the oil in the accumulator would, over time, leak past the operating rod thus discharge the accumulator. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>This process would indeed take some time but would certainly completely relieve most, if not all the residual accumulator pressure overnight.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>If however the operating valve ball is still in contact with its seat (i.e. not being lifted) the oil pressure would not reach the small clearance between the valve push rod and the housing and, other than past the accumulator rings there is nowhere for that pressure to be relieved. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>I would presume that Overdrive Spares installed an accumulator with an "O" ring rather than the original cast iron rings. If the original type accumulator piston was still fitted, oil would seep past the cast iron rings to relieve the pressure, albeit very slowly, and again the accumulator pressure would be discharged overnight..<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>The cam on the operating shaft, the one which lifts the operating valve push rod and thus the operating valve ball, is locked to the shaft with a small taper pin. I would guess that the taper pin has either fallen out or sheared. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>Bad news is that this pin cannot be accessed without removing and disassembling the overdrive.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif'>M<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Sat, Apr 16, 2022 at 1:19 PM Simon Lachlan via Healeys <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>My OD is driving me mad and I definitely need some inspired advice. A bit of background first. I’ll try to lay out all the facts in a logical sequence. (I’m increasingly reluctant to link ODs with logic!)<o:p></o:p></p><ol start=1 type=1><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>I’d say that the OD has done +/- 15k miles since a total rebuild by Overdrive Spares here in UK.<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>The OD had issues before Christmas (21) and was sorted out by OD Spares. The accumulator was uprated and pressure issues sorted.<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>OD functioned 100% on the few times I’d been able to take it out since then until..<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>One day, the OD stopped functioning.<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>I checked the electrics. All fine there so I delved a bit deeper.<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>It had fried its solenoid which I replaced. But…<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>That did not fix the problem so…<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>I decided that the operating valve’s adjustment might be off so..<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>I bought a dial gauge and hoped to sort it out precisely rather than by “feel”, which I lack in this area.<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>Prior to using the gauge I decided to see if the OD was functioning at all so I raised the car on stands and fitted my pressure gauge.<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>I get a reading of 500psi rising a bit when I rev the engine but I’d suppose that would drop when the oil warms up.<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>BUT, and this is where things go pear-shaped…moving the little lever on the RHS up and down does not engage/disengage OD. There is no change on the gauge to show OD engaging or disengaging.<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>AND, the gauge stays at 500psi even when the engine is off. Moving the lever 20 times has zero effect. Stayed at 500 overnight!<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>Of course, I checked for dirt in the operating valve area. None.<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>Likewise, the tiny hole in the “valve – operating” (the spindle thing which the ball sits on)….that’s clear. And surely, the pressure would diminish overnight if something in that area was partially obstructed?<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>When I remove the pressure valve, there’s a small spillage – no more than you’d expect – but repeating the pressure gauge process only returns the same results.<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>I see in the bible according to Norman Nock that “Holding this lever with your thumb and index finger, you should be able to push the lever down lightly about ⅜” until you feel a slight spring pressure resistance. The lever should go down another ¼” after encountering the resistance……” ie there’s about ⅝” movement up & down in that lever. Well, my lever does move and does lift the ball, but there’s not ⅝” movement there. Could that be the problem area???<o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>Almost finished…keep reading!<o:p></o:p></li></ol><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'>So, I’m stumped. Every time I learn something new about the OD, it has a new trick to baffle me.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'>I’ve no 100% sure way of telling whether it’s gone into OD and stuck there or whether it’s simply not going into OD at all.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'>I’ve done a lot of reading through my books and collection of advice from the various gurus and found reference to ODs being stuck but those seemed to be to do with “weak springs” which, particularly after a long lay-off, wouldn’t disengage. The cure for this being a good smack on the steel plate sandwiched in the OD from below. Well, that seems to be a stuck mechanism issue whereas I’m facing a hydraulic conundrum. Or am I?<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'>There is what is usually referred to as the “pressure relief valve” adjacent to the accumulator. The name suggested that pressure might be stuck in that area….but surely not overnight?<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'>Any ideas? I am particularly reluctant to take the gearbox and OD out. You’ll recall the ridiculous business of the defective clutch kit? Well, I forget whether we had the box in and out 3 times or 4. I’d hoped not to do it again so soon or ever for that matter.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'>I’m hoping for a miracle of course but some sound advice would be a godsend…………<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'>Thanks,<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'>Simon<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:18.0pt'> <o:p></o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br>Support Team.Net <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Suggested annual donation $12.75<br><br>Archive: <a href="http://www.team.net/pipermail/healeys" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive/healeys" target="_blank">http://autox.team.net/archive/healeys</a><br><br><a href="mailto:Healeys@autox.team.net" target="_blank">Healeys@autox.team.net</a><br><a href="http://autox.team.net/mailman/listinfo/healeys" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/michaelsalter@gmailcom" target="_blank">http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com</a><o:p></o:p></p></blockquote></div><p class=MsoNormal><br><br><o:p></o:p></p><pre>_______________________________________________<o:p></o:p></pre><pre>Support Team.Net <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><o:p></o:p></pre><pre>Suggested annual donation $12.75<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Archive: <a href="http://www.team.net/pipermail/healeys" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive/healeys" target="_blank">http://autox.team.net/archive/healeys</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre><a href="mailto:Healeys@autox.team.net" target="_blank">Healeys@autox.team.net</a><o:p></o:p></pre><pre><a href="http://autox.team.net/mailman/listinfo/healeys" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/bspidell@comcast.net" target="_blank">http://autox.team.net/mailman/options/healeys/bspidell@comcast.net</a><o:p></o:p></pre><pre><o:p> </o:p></pre></blockquote><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'>_______________________________________________<br>Support Team.Net <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br>Suggested annual donation $12.75<br><br>Archive: <a href="http://www.team.net/pipermail/healeys" target="_blank">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive/healeys" target="_blank">http://autox.team.net/archive/healeys</a><br><br><a href="mailto:Healeys@autox.team.net" target="_blank">Healeys@autox.team.net</a><br><a href="http://autox.team.net/mailman/listinfo/healeys" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a><br><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/healeys/michaelsalter@gmailcom" target="_blank">http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com</a><o:p></o:p></p></blockquote></div></blockquote><p class=MsoNormal><o:p> </o:p></p></div></body></html>