<VV> Re: Holding a Valve Seat ?

[J R Read_HML]

I've heard of (but never seen) a method of threading the seats and screwing 
them in.  Don't know if this is fact or fiction.  Supposedly it is an 
aircraft engine approach....

Some of you flyer types may probably know more about this.

Attachments (if any) are scanned with anti-virus software.

Later, JR

----- Original Message ----- 
From: "John Dozsa" <jdozsa@carr.org>
To: "Virtual Vairs" <virtualvairs@corvair.org>; "Bob Helt" <BobHelt@aol.com>
Sent: Wednesday, February 09, 2005 9:08 AM
Subject: <VV> Re: Holding a Valve Seat ?


>>    Date: Tue, 8 Feb 2005 15:40:37 EST
>>    From: bobhelt@aol.com
>> Subject: Re: Holding a Valve Seat ?
>>
>> In a message dated 2/8/05 1:30:06 PM US Mountain Standard Time,
>> burnnvair@yahoo.com writes:
>>
>> > I may be missing the the mark,  I thought the fix was
>> > staking the seat ... or should I say rolling the
>> > aluminum to lock the seat in. It seems a press fit
>> > alone, no matter the alloy or heat treating of
>> > aluminum will expand and contract differently than
>> > steel. Even if the seat come loose it won't pop out
>> > and wipe the motor.
>> >
>>
>> No, Staking just doesn't work according to many people's experiences over 
>> 40
>> years.
>>  And there is no way to roll the alum to lock in the seat with all normal 
>> and
>> standard type seats.
>> Regards,
>> Bob Helt
>
> How about the set screw technique, half in the seat, half in the head?
> Does it work?  Is there a problem with the set screws coming out?  Is
> there a set screw material that expands faster than the head and seat?
> It would lock itself in as the temperature increased.
>
> John Dozsa
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