Subject: Re: [Healeys] Overdrive Piston Rings

From: David Nock <[email-masked]>
Date: Sun, 4 Sep 2022 09:16:59 -0700

The wide rings are expander rings and go first. Then the narrow rings go on. Do you have the pump out. If so take a close looks at the ball seat. They usually wear on one side, and will need to have a new seat cut so the check ball seats good on the pump body. 
This is a common problem causing low Previn the overdrive 

David Nock

Sent from my iPhone

> On Sep 4, 2022, at 8:58 AM, Joseph Costa via Healeys <[email-masked]> wrote:
> 
> 
> I have the larger overdrive piston from BCS -note to John many thanks for getting it here Friday - I have 4 thin rings and 2 larger rings.  Do the larger rings go on first and then the thinner over them.  I assume I should space them as piston rings are spaced.
> 
> Second, I have a new spring and ball for the pump.  The springs are the same length but the new spring has fewer coils.  Which is the better option to use?
> 
> TIA
> Joe
> BN1 #923
> 100M
> BJ8
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From: jomar healey via Healeys <[email-masked]>
Date: Sun, 4 Sep 2022 16:47:47 +0000 (UTC)

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 David
=C2=A0 I do not have the overdrive out of the car and am working from jack =
stands. =C2=A0For now I'm adding the larger piston and a new pump ball and =
spring. =C2=A0I will seat the pump ball as you have suggested. =C2=A0If thi=
s doesn't work I'll pull the drive over the winter for a complete rebuild. =
=C2=A0You would think that after working properly for only 70 years they wo=
uld have had better build quality when they were originally produced.
Joe
Any thoughts on the springs?
    On Sunday, September 4, 2022, 12:20:19 PM EDT, David Nock <healeydoc@gm=
ail.com> wrote: =20
=20
 The wide rings are expander rings and go first. Then the narrow rings go o=
n. Do you have the pump out. If so take a close looks at the ball seat. The=
y usually wear on one side, and will need to have a new seat cut so the che=
ck ball seats good on the pump body.=20
This is a common problem causing low Previn the overdrive=20

David Nock

Sent from my iPhone

> On Sep 4, 2022, at 8:58 AM, Joseph Costa via Healeys <[email-masked].=
net> wrote:
>=20
> =EF=BB=BF
> I have the larger overdrive piston from BCS -note to John many thanks for=
 getting it here Friday - I have 4 thin rings and 2 larger rings.=C2=A0 Do =
the larger rings go on first and then the thinner over them.=C2=A0 I assume=
 I should space them as piston rings are spaced.
>=20
> Second, I have a new spring and ball for the pump.=C2=A0 The springs are =
the same length but the new spring has fewer coils.=C2=A0 Which is the bett=
er option to use?
>=20
> Suggested annual donation=C2=A0 $12.75
>=20
> Archive: http://www.team.net/pipermail/healeys http://autox.team.net/arch=
ive/healeys
>=20
>=20
> Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/healeyd=
[email-masked]
>=20

Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archiv=
e/healeys

[email-masked]

o.com

 =20
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<html><head></head><body><div class=3D"ydp41dea618yahoo-style-wrap" style=
=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px=
;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"false">David</div><div dir=3D"ltr" =
data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">&nbs=
p; I do not have the overdrive out of the car and am working from jack stan=
ds. &nbsp;For now I'm adding the larger piston and a new pump ball and spri=
ng. &nbsp;I will seat the pump ball as you have suggested. &nbsp;If this do=
esn't work I'll pull the drive over the winter for a complete rebuild. &nbs=
p;You would think that after working properly for only 70 years they would =
have had better build quality when they were originally produced.</div><div=
 dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=
=3D"false">Joe</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div d=
ir=3D"ltr" data-setdir=3D"false">Any thoughts on the springs?</div><div><br=
></div>
       =20
        </div><div id=3D"yahoo_quoted_2798928891" class=3D"yahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Sunday, September 4, 2022, 12:20:19 PM EDT, David No=
ck &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div dir=3D"ltr">The wide rings are expander rings and=
 go first. Then the narrow rings go on. Do you have the pump out. If so tak=
e a close looks at the ball seat. They usually wear on one side, and will n=
eed to have a new seat cut so the check ball seats good on the pump body. <=
br clear=3D"none">This is a common problem causing low Previn the overdrive=
 <br clear=3D"none"><br clear=3D"none">David Nock<br clear=3D"none"><br cle=
ar=3D"none">Sent from my iPhone<br clear=3D"none"><br clear=3D"none">&gt; O=
n Sep 4, 2022, at 8:58 AM, Joseph Costa via Healeys &lt;<a shape=3D"rect" y=
mailto=3D"mailto:[email-masked]" href=3D"mailto:[email-masked].=
net">[email-masked]</a>&gt; wrote:<br clear=3D"none">&gt; <br clear=
=3D"none">&gt; =EF=BB=BF<br clear=3D"none">&gt; I have the larger overdrive=
 piston from BCS -note to John many thanks for getting it here Friday - I h=
ave 4 thin rings and 2 larger rings.&nbsp; Do the larger rings go on first =
and then the thinner over them.&nbsp; I assume I should space them as pisto=
n rings are spaced.<br clear=3D"none">&gt; <br clear=3D"none">&gt; Second, =
I have a new spring and ball for the pump.&nbsp; The springs are the same l=
ength but the new spring has fewer coils.&nbsp; Which is the better option =
to use?<br clear=3D"none">&gt; <br clear=3D"none">&gt; TIA<br clear=3D"none=
">&gt; Joe<br clear=3D"none">&gt; BN1 #923<br clear=3D"none">&gt; 100M<br c=
lear=3D"none">&gt; BJ8<br clear=3D"none">&gt; _____________________________=
__________________<br clear=3D"none">&gt; Support Team.Net <a shape=3D"rect=
" href=3D"http://www.team.net/donate.html" target=3D"_blank">http://www.tea=
m.net/donate.html</a><br clear=3D"none">&gt; Suggested annual donation&nbsp=
; $12.75<br clear=3D"none">&gt; <br clear=3D"none">&gt; Archive: <a shape=
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[email-masked]

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From: Bob Haskell <[email-masked]>
Date: Sun, 4 Sep 2022 13:11:43 -0400

David,

How do you cut a new seat?  Ball end mill?

Cheers,

Bob Haskell
Austin Healey 3000 BN7/BT7 registrar

On 9/4/22 12:16 PM, David Nock wrote:
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From: John Spaur via Healeys <[email-masked]>
Date: Sun, 4 Sep 2022 14:31:43 -0700

David,

What size ball end mill is needed and how is it aligned in the bore?

John Spaur

-----Original Message-----
From: Healeys [mailto:[email-masked]] On Behalf Of Bob Haskell
Sent: Sunday, September 4, 2022 10:12 AM
To: David Nock <[email-masked]>; Joseph Costa <[email-masked]>
Cc: Healeys at Autox <[email-masked]>
Subject: Re: [Healeys] Overdrive Piston Rings

David,

Cheers,

Bob Haskell

On 9/4/22 12:16 PM, David Nock wrote:
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>
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