[Healeys] Overdrive pressure or clutch slip
Michael Salter
michaelsalter at gmail.com
Mon Apr 22 07:03:17 MDT 2024
In my experience relays are yes/no. No "maybe".
On Mon., Apr. 22, 2024, 8:08 a.m. Simon Lachlan via Healeys, <
healeys at autox.team.net> wrote:
> You may recall the very extended overdrive and clutch saga last year. Long
> story short(ish)…
>
> OD was slipping in and out depending on oil temperature.
>
> Correctly diagnosed pressure. Checked with gauge.
>
> Attempted rebuild…going only so far as accumulator and related seals.
>
> 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.
>
> Took it up to OD Spares who fixed it..new housing etcetc
>
> Why not a new clutch I thought? Sensible while you’re in the area looking
> at a 30+ yr old item.
>
> New clutch…no good. Noisy, wouldn’t engage/disengage/play at all.
>
> Gearbox out again.
>
> Refit clutch. Presumed I’d made some beginner’s mistake.
>
> Refit gearbox…no good. Same
>
> Can’t recall whether I tried again. Lost count and enthusiasm by now.
>
> Turned out that the new clutch kit was defective. (Thanks Mirek) (Genuine
> B&B from AHSpares).
>
> New one did work.
>
> Saga over until yesterday.
>
> Same sort of symptoms…..
>
> 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)
>
> Symptoms continue if it’s in or out of OD.
>
> Symptoms reduce at speed.
>
> Yes, plenty of oil. Over the full mark. Looks very clean. Pretty sure it’s
> 40wt non-detergent topped up with 30wt non-detergent. (Or vice-versa). Am
> confident in state of the filter, magnets etc.
>
> 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.
>
> What I want and experience tells me I’m unlikely to get is a miracle cure!
>
> One initial question…..do OD relays either work or not work? ie, can the
> relay hover between on and off 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.
>
> And a supplementary….how do I bench test the relay?
>
> Simon
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