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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>I’ve not looked at that yet. Not ruling it out but I’ve a feeling that, even if it had “gone intermittent”, the OD would jump in & out quite abruptly rather than slip/fade which I’m currently experiencing. But I’ll certainly have a look. The relay is one that I’ve rebuilt…..gutted the old stuff out and swapped in a little modern relay. I’d expect that to be fairly reliable, likewise to (probably?!) fail 100% or work 100%.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>Next on the list seems to me to be the Throttle Switch which, I suspect, could just about give one a slipping effect.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>OD clutch? Never done that. Never been there. I’ve pretty well drawn the line at accumulators/pressure issues. Always with help and advice from “The List” . <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>Could my problem be OD clutch slip? <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>How do I diagnose that and how do I get myself in a position where I <i>know</i> it’s the OD clutch and I <i>know</i> that it’s sensible to take the box out and drive it up to ODSpares one (very) early morning?<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>Simon<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;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 style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Healeys <healeys-bounces@autox.team.net> <b>On Behalf Of </b>Bob Spidell<br><b>Sent:</b> Thursday, April 25, 2024 6:00 PM<br><b>To:</b> healeys@autox.team.net<br><b>Subject:</b> Re: [Healeys] Overdrive pressure or clutch slip Step 2!<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Simon,<br><br>What have you done to rule out the O/D relay (the one on the scuttle). I've had them go intermittent.<br><br>Bob<o:p></o:p></p><div><p class=MsoNormal>On 4/25/2024 9:29 AM, Simon Lachlan via Healeys wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>So, here is Michael’s “Step 1” completed. (See his email, below).</span><o:p></o:p></p><ol style='margin-top:0cm' start=1 type=1><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo3'><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>Removed the operating valve and, just for luck, disconnected the two wires into 3<sup>rd</sup>/4<sup>th</sup> switch. Took the car for a spin. Up/down longish/steepish hills, 10 miles on motorway. Various rpm…..no slippage at all.</span><o:p></o:p></li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo3'><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>Had a puncture…..nail in tyre. Rear RHS. Flat as a pancake at once. Nearly onto rim. Nail! I imagine the inner tube is shredded and the tyre may be a write-off. (Usually are!). Anyhow, I bore you with this as I’m convinced that I’d never have got the wheel off without the little scissors jack which I carry to get the car up the first few inches until the Healey jack comes into play. Just a suggestion…….</span><o:p></o:p></li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo3'><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>Got home and jacked car up to test pressure. Steady at 520psi which, I recall, is plenty. Stayed at 520 across rev range. Dropped very slowly once engine was off and dropped to zero as I engaged/disengaged OD a few times. Which is normal I think?</span><o:p></o:p></li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo3'><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>Solenoid makes a robust “click” when it should and engages the OD when activated.</span><o:p></o:p></li></ol><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>So what’s a sensible “Step 2”??</span><o:p></o:p></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>I have been urged to check the setting of the Throttle Switch (TS). Assuming that the slippage returns (and why wouldn’t it?), I’ll short the TS out to see if that fixes it. If it does, I’ll check the adjustment.</span><o:p></o:p></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>Suggestions would be more than welcome……I do dread having to take that box out again. I’ve got a very adequate ramp and a very strong volunteer(?) but, regardless of all that, it’s still quite a task. And, like a few of us, I’m not as young as I once was. I’ve always enjoyed the lines from the manual which I reproduce, below. “Gently ease”!?! </span><o:p></o:p></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'><img width=495 height=73 style='width:5.1583in;height:.7583in' id="Picture_x0020_1" src="cid:image001.png@01DA9751.682E4960"></span><o:p></o:p></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'>Thanks, Simon</span><o:p></o:p></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif;mso-fareast-language:EN-US'> </span><o:p></o:p></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Michael Salter <a href="mailto:michaelsalter@gmail.com"><michaelsalter@gmail.com></a> <br><b>Sent:</b> Monday, April 22, 2024 3:21 PM<br><b>To:</b> Simon Lachlan <a href="mailto:simon.lachlan@alexarevel.plus.com"><simon.lachlan@alexarevel.plus.com></a><br><b>Cc:</b> Healeys <a href="mailto:healeys@autox.team.net"><healeys@autox.team.net></a><br><b>Subject:</b> Re: [Healeys] Overdrive pressure or clutch slip</span><o:p></o:p></p></div><p class=MsoNormal> <o:p></o:p></p><div><div><p class=MsoNormal><b><u>Correct diagnosis is 1/2 the repair!!</u></b><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><p class=MsoNormal>First you need to confirm whether the clutch (on the flywheel) or the overdrive is causing the slippage. <o:p></o:p></p><div><p class=MsoNormal>To do this you ABSOLUTELY MUST disable the overdrive as a badly misadjuster overdrive operating valve can produce similar symptoms. <o:p></o:p></p></div><div><p class=MsoNormal>To do this I would remove the overdrive operating valve completely. (There are other ways but this is absolutely definitive).<o:p></o:p></p></div><div><p class=MsoNormal>Now drive the car up a long hill where you are amle to use full throttle at around 3000 RPM (maximum torque) for a few seconds. If it is the clutch (on the flywheel) that is causing the slippage these operating conditions. Test this a few times to be sure.<o:p></o:p></p></div><div><p class=MsoNormal>If there is no slippage we have confirmed that the overdrive clutch is at fault.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Step 1 completed. Please report results. MS.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div></div><p class=MsoNormal> <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-top:5.0pt;margin-right:0cm;margin-bottom:50pt'><div><div><p class=MsoNormal>On Mon., Apr. 22, 2024, 8:08 a.m. 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-top:5.0pt;margin-right:0cm;margin-bottom:50pt'><div><p><span style='font-family:"Times New Roman",serif'>You may recall the very extended overdrive and clutch saga last year.</span> <span style='font-family:"Times New Roman",serif'>Long story short(ish)…</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>OD was slipping in and out depending on oil temperature.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Correctly diagnosed pressure. Checked with gauge.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Attempted rebuild…going only so far as</span> <span style='font-family:"Times New Roman",serif'>accumulator and related seals.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Stymied as could not get pump out. Turned out to have been “fixed” at some stage with some form of “chemical metal” which was coming loose/apart.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Took it up to OD Spares who fixed it..new housing etcetc</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Why not a new clutch I thought? Sensible while you’re in the area looking at a 30+ yr old item.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>New clutch…no good. Noisy, wouldn’t</span> <span style='font-family:"Times New Roman",serif'>engage/disengage/play at all.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Gearbox out again.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Refit clutch. Presumed I’d made some beginner’s mistake.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Refit gearbox…no good. Same</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Can’t recall whether I tried again. Lost count and enthusiasm by now.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Turned out that the new clutch kit was defective. (Thanks Mirek) (Genuine B&B from AHSpares).</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>New one did work.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Saga over until yesterday.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Same sort of symptoms…..</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>All’s well for first 10 or so miles. Then the dreaded slippage(?) starts. But it’s not quite the same. Reminds me more of a slipping clutch. (But NO smell)</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Symptoms continue if it’s in or out of OD.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Symptoms reduce at speed.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Yes, plenty of oil. Over the full mark. Looks very clean. Pretty sure it’s 40wt</span> <span style='font-family:"Times New Roman",serif'>non-detergent topped up with 30wt non-detergent. (Or vice-versa).</span> <span style='font-family:"Times New Roman",serif'>Am confident in state of the filter, magnets etc.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>No, I have not pressure tested it yet and yes, I dread restarting the whole bloody process all over again. I’m not sure I can face taking the box out again once, let alone multiple times.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>What I want and experience tells me I’m unlikely to get is a miracle cure!</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>One initial question…..do OD relays either work or not work? ie, can the relay hover between on and off</span> <span style='font-family:"Times New Roman",serif'>which might lead to the OD coming in and out? I think that could happen if the switch is off but the unit still hasn’t got the message to disengage from the bulkhead switch.</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>And a supplementary….how</span> <span style='font-family:"Times New Roman",serif'>do I bench test</span> <span style='font-family:"Times New Roman",serif'>the relay?</span><o:p></o:p></p><p><span style='font-family:"Times New Roman",serif'>Simon</span><o:p></o:p></p></div></blockquote></div></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">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">http://www.team.net/pipermail/healeys</a> <a href="http://autox.team.net/archive/healeys">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">Healeys@autox.team.net</a><o:p></o:p></pre><pre><a href="http://autox.team.net/mailman/listinfo/healeys">http://autox.teamnet/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">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></body></html>