Never had a problem with mine. Had the tr3 done by the RF in 94 been great
since then. I had hardened seats put in my mgb project car. Machinest had no
problem doing the job. That said I did take the tr head to a local shop before
sending it to the RF. they made a mess of the head and said they couldn't get
the seats to fit. Don't know if the RF still has their cars maintenance
service but I would recommend contacting them.
Pete
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: Bob <yellowtr@adelphia.net>
Sender: triumphs-bounces@autox.team.net
Date: Tue, 23 Nov 2010 07:44:21
To: <triumphs@autox.team.net>
Subject: Re: [TR] Hardened seats and cracked heads
On Monday, November 22, 2010 03:32:47 pm fogbro1@comcast.net wrote:
> List,
>
>
>
> A machine shop is telling me that they will no longer install hardened
> valve seats in cast iron heads because doing so substantially increases
> the chance of the head cracking. Supposedly (they say) this is even more
> risky with highly tuned street or race engines. Are they blowing smoke or
> is this true? Comments......
>
>
>
> Ed Woods
Ed,
I have the hardened seats installed on my 3, 4 and 6. So far with the 3 and 4
no problems. The 6 motor only has about 1 hour on the engine so it is to soon
to tell.
The machine shop I use said nothing about the process when I dropped the heads
off. No cautions, etc.
The 3 engine is 87MM otherwise stock. The 4 is stock all the way and so is the
6. Minor head shaving just to insure a flat surface only.
Maybe their concern is the seat will expand and contract at different rates
than the surrounding cast iron? But if so, wouldn't my machine shop know of
this and refused?
Curious to hear other replies.
Bob
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