<div dir="auto">Time this question was put to bed.<div dir="auto">1. The throttle switch is not supposed to disengage the overdrive if the dash switch is in the "OVERDRIVE" position. If it does the system is wired incorrectly. (BN1s are a little different)</div><div dir="auto">2. Overdrives which slip out, slip, or won't engage WHEN HOT but do work when cold are invariably suffering from low oil pressure which is almost always caused by accumulator issues. The "O" rings on the outside of the accumulator sleeve can be a problem but in my experience scoring of the accumulator bore and damage to the rings and piston are a more common cause.</div><div dir="auto">3. Overdrives and gearboxes in Healeys are meant to be lubricated with engine oil. Decades ago I wrote to Laycock DeNormanville, back when letters went in envelopes with stamps, and received a response from their engineering department indicating clearly that the oil specified for their products was specified by the gearbox manufacturer and whatever they specified was acceptable for the overdrive.</div><div dir="auto">M</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri., Mar. 26, 2021, 2:13 a.m. WILLIAM B LAWRENCE via Healeys, <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>The symptoms I’ve seen and experienced are that the OD will engage and function until the oil temp comes up and the viscosity drops off and will then fail. I suppose it depends on the degree of degradation of the o-rings.</div>
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<div id="m_2913893478454826311divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Healeys <<a href="mailto:healeys-bounces@autox.team.net" target="_blank" rel="noreferrer">healeys-bounces@autox.team.net</a>> on behalf of Bob Spidell <<a href="mailto:bspidell@comcast.net" target="_blank" rel="noreferrer">bspidell@comcast.net</a>><br>
<b>Sent:</b> Thursday, March 25, 2021 11:14 PM<br>
<b>To:</b> <a href="mailto:healeys@autox.team.net" target="_blank" rel="noreferrer">healeys@autox.team.net</a> <<a href="mailto:healeys@autox.team.net" target="_blank" rel="noreferrer">healeys@autox.team.net</a>><br>
<b>Subject:</b> Re: [Healeys] overdrive problem</font>
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<div>Sure, but wouldn't faulty O-rings prevent the OD from engaging in the first place? Just guessing, but wouldn't a deficient pump cause same symptoms?<br>
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<div>On 3/25/2021 4:07 PM, WILLIAM B LAWRENCE via Healeys wrote:<br>
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<div>Sorry, but the Laycock deNormanville overdrive is not supposed to kick down automatically. The most common fault that causes the OD to drop out is faulty o-rings on the accumulator sleeve. This won’t allow the OD to build full operating pressure.</div>
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<div>Bill Lawrence</div>
<div>BN1 #554</div>
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<div id="m_2913893478454826311x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Healeys
<a href="mailto:healeys-bounces@autox.team.net" target="_blank" rel="noreferrer"><healeys-bounces@autox.team.net></a> on behalf of Kees Oudesluijs via Healeys
<a href="mailto:healeys@autox.team.net" target="_blank" rel="noreferrer"><healeys@autox.team.net></a><br>
<b>Sent:</b> Tuesday, March 23, 2021 7:37 AM<br>
<b>To:</b> <a href="mailto:healeys@autox.team.net" target="_blank" rel="noreferrer">
healeys@autox.team.net</a> <a href="mailto:healeys@autox.team.net" target="_blank" rel="noreferrer">
<healeys@autox.team.net></a><br>
<b>Subject:</b> Re: [Healeys] overdrive problem</font>
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<div>That is the way it should be when accelerating hard, Kick down!!<br>
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Kees Oudesluijs<br>
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Op 23-3-2021 om 01:06 schreef healeymanjim via Healeys:<br>
> friends BT7 had o/d quit. solenoid was bad so replaced it. now it will go into o/d but pop out when accelerating. any<br>
> ideas what the cause is and the fix?<br>
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