[Healeys] Overdrive Piston Rings

[John Spaur]

David,

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

John Spaur

-----Original Message-----
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Bob Haskell
Sent: Sunday, September 4, 2022 10:12 AM
To: David Nock <healeydoc at gmail.com>; Joseph Costa <healey53 at gmail.com>
Cc: Healeys at Autox <healeys at autox.team.net>
Subject: Re: [Healeys] Overdrive Piston Rings

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:
> 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 <healeys at autox.team.net> 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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