[Healeys] Fwd: Re: Overdrive non return valve Question

[Michael Salter]

Sorry but suggesting a replacement accumulator has me confused.  If the
pressure is staying up as described surely the accumulator is not leaking
badly ... what am I missing?
M

On Mon., May 25, 2020, 12:10 a.m. Roger Grace, <roggrace at telus.net> wrote:

>
>
> As you say you need need new accumulator piston/rings/sleeve and O-Rings.
> This improved pressure on mine from 340 psi with very slow engaging to
> over 550 psi.
> Works fine now.
> Suggest that you upgrade to the modern O ring style piston instead of the
> original metal ring style.
> If you were closer could let you have the extra new spring that I have,
> but Can border closed.
> Overdrive Spares in UK are most helpful.
> Good luck ...
> rg
>
> ----- Original Message -----
> From: jpaynepbr at cox.net
> To: gradea1 at charter.net
> Cc: healeys at autox.team.net
> Sent: Sun, 24 May 2020 20:21:52 -0600 (MDT)
> Subject: Re: [Healeys] Overdrive non return valve Question
>
> Shimmed the spring on the pump check valve by .08”.
>
>
>
> Shope let me borrow an accumulator spring that was 3/64” longer.
>
>
>
> Up to over 450+ psi now.  OD will engage with the rear jacked up, but not
> while driving.  On jack stands, when OD is engaged, drops to +/- 410 psi
> then quickly comes back up to 450+.
>
>
>
> Did not change out accumulator piston/rings/sleeve or O-Rings yet, was
> hoping to avoid that.
>
>
>
> Thinking about trying a 1/16” washer to shim the accumulator spring or is
> it a lost cause?
>
>
>
>
>
>
>
> *From:* gradea1 at charter.net <gradea1 at charter.net>
> *Sent:* Sunday, May 24, 2020 10:26 AM
> *To:* 'jpaynepbr at cox.net' <jpaynepbr at cox.net>
> *Cc:* 'healeys at autox.team.net' <healeys at autox.team.net>
> *Subject:* RE: [Healeys] Overdrive non return valve Question
>
>
>
> OD Pressure should be much higher-could be 600 PSI. As I previously
> stated, be sure that the ball in the operating valve is the correct size-
> 1/4" OD in pump valve. The upper valve uses a 5/16" OD ball and you cannot
> mix them up, our your pressure will not be there. Too large or small a ball
> will not seat in the valve chamber. Also, if replacing with a new ball and
> spring, take a brass drift and "seat" the ball in its position. What is the
> condition of the piston rings and O rings...they must be up to the task as
> well for them to hold that huge pressure. Use sealant on all gaskets and in
> addition the brake ring seal to each side of the case (ignore the passage
> in the workshop book that says no sealant there-just be careful when
> applying it). Hank
>
> -----------------------------------------
>
> From: jpaynepbr at cox.net
> To: healeys at autox.team.net
> Cc:
> Sent: Saturday May 23 2020 5:36:24PM
> Subject: [Healeys] Overdrive non return valve Question
>
> So I pressure tested the OD at the operating valve plug – 370 PSI at 1,000
> RPM in 4th.   Drops to about 340 PSI when I attempt to engage the OD. OD
> did not engage.
>
> This is with the back end on jack stands (not the recalled ones!), so it
> is under no load.
>
> Held 150 PSI for about 20 minutes after being shut off and then took about
> 2 hours to drop below 100 PSI.  At least I now have a better understanding
> of why these things leak so badly.  Who in their right mind would design
> something to hold that sort of residual oil pressure?
>
> Based on all the reading, pressure is too low, but nothing appears way off?
>
> I’m using the Team.Net Tech site.
> http://www.team.net/www/healey/tech/big_hly/od/delborder_od.html
>
>
>
> Next step is to check the non return valve spring.
>
>  Question, why would I take it to a machinist to add .084” to the head of
> the little plunger instead of just putting a washer on the back side of the
> head of the plunger?
>
> If the stem length/ insertion length into spring is that important,
> couldn’t I could add length to that at home with my mig welder and file it
> so that the spring moves freely and doesn’t hang up?
>
> From the team.net site :
>
> psi, but for proper operation, the pressure should be at 470 to 490 psi.
>
> Now, finally... the OD low oil pressure cause and fix. A fatigued spring
> in the non-return valve portion of the OD (see Fig. 6.19). What? Is that
> it? You must be kidding - I waited two months for this? Yes, it does seem
> sort of anti-climactic, but this spring can cause major frustration.
> Springs are like people - as they age, they get shorter and weaker. As you
> can see in Fig. 6.19, the spring pushes against a ball and plunger. The
> purpose of this spring is to allow the ball to lift from its seat at each
> power stroke of the OD pump, allowing oil to flow into the pressurized
> accumulating chamber, [image: Image removed by sender. rework of the OD
> hydraulic pump valve]
>
>
>
>
>
>
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