[DeTomaso] Thermostat Question for the team!

[Ken and Lela MacArthur]

Dennis, don't know if this went thru, trying again. Just my experience going to a Robert Shaw.

________________________________
From: Ken and Lela MacArthur <klckmac at msn.com>
Sent: Friday, July 12, 2019 8:07 AM
To: Dennis Valdez
Subject: Re: [DeTomaso] Thermostat Question for the team!


Dennis,


I went through this a couple of years ago. I had assumed the old T stat was "normal", but wanted the new Robert Shaw T stat since I hadn't addressed this issue since buying the car. I had always noticed slow warmups and elevated temps, especially during stop and go driving, but when I looked inside the housing, I found not only the wrong T stat, but a penny had been soldered over the restrictor plate. I took a small drill bit, put a small hole in it and pried the penny out. Once out, I just gently levered out the older restrictor plate by inserting a small flathead through the hole and working my way around, tapping gently. Then I inserted a small "hook" style tool in the hole and applied some upward pressure. It eventually popped out fairly easy, I then cleaned up the hole and installed the new restrictor plate, now everything flows properly and the car warms up quick vs. being bypassed. The Robert Shaw package fits perfect and I am quite happy with how everything works. I also may have some before and after pics if you want.


Good luck,


Ken MacArthur

72L 4443



________________________________
From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of Dennis Valdez via DeTomaso <detomaso at server.detomasolist.com>
Sent: Thursday, July 11, 2019 5:30 PM
To: List DeTomaso Forum
Subject: [DeTomaso] Thermostat Question for the team!

Hello all,
I'm changing the Thermostat on my car and have run into a problem that I need some opinions on.
My car is completely stock and I don't think the Tstat has ever been replaced.  Some time ago I purchased the correct 180degree Robertshaw Tstat along with a brass restrictor plate from MARLINJACK.
When I pulled the old Tstat out, I compared it to the new one, and although they look almost identical, the "Hat" on the end of the button on the old Tstat is a bit smaller than the new Tstat on the right in the photo:


The two parts I got from MarlinJack fit together with very little clearance between the hat and the hole in the restrictor plate:


I was hoping to not replace the old restrictor plate, but my concern is that if the hole in the stock restrictor plate is too small, then the new thermostat will not open fully when the larger "hat" does not fit into the smaller hole.


Has anyone seen this problem and have any suggestions?  How does one get the old restrictor plate out of the block? It seems to be a press fit like a freeze plug and I don't want to cause damage trying to pry it out.
Thanks in advance for your help!
Dennis
-------------- next part --------------
   Dennis, don't know if this went thru, trying again. Just my experience
   going to a Robert Shaw.
     __________________________________________________________________

   From: Ken and Lela MacArthur <klckmac at msn.com>
   Sent: Friday, July 12, 2019 8:07 AM
   To: Dennis Valdez
   Subject: Re: [DeTomaso] Thermostat Question for the team!

   Dennis,

   I went through this a couple of years ago. I had assumed the old T stat
   was "normal", but wanted the new Robert Shaw T stat since I hadn't
   addressed this issue since buying the car. I had always noticed slow
   warmups and elevated temps, especially during stop and go driving, but
   when I looked inside the housing, I found not only the wrong T stat,
   but a penny had been soldered over the restrictor plate. I took a small
   drill bit, put a small hole in it and pried the penny out. Once out, I
   just gently levered out the older restrictor plate by inserting a small
   flathead through the hole and working my way around, tapping gently.
   Then I inserted a small "hook" style tool in the hole and applied some
   upward pressure. It eventually popped out fairly easy, I then cleaned
   up the hole and installed the new restrictor plate, now everything
   flows properly and the car warms up quick vs. being bypassed. The
   Robert Shaw package fits perfect and I am quite happy with how
   everything works. I also may have some before and after pics if you
   want.

   Good luck,

   Ken MacArthur

   72L 4443
     __________________________________________________________________

   From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
   Dennis Valdez via DeTomaso <detomaso at server.detomasolist.com>
   Sent: Thursday, July 11, 2019 5:30 PM
   To: List DeTomaso Forum
   Subject: [DeTomaso] Thermostat Question for the team!

   Hello all,
   I'm changing the Thermostat on my car and have run into a problem that
   I need some opinions on.
   My car is completely stock and I don't think the Tstat has ever been
   replaced.  Some time ago I purchased the correct 180degree Robertshaw
   Tstat along with a brass restrictor plate from MARLINJACK.
   When I pulled the old Tstat out, I compared it to the new one, and
   although they look almost identical, the "Hat" on the end of the button
   on the old Tstat is a bit smaller than the new Tstat on the right in
   the photo:
   The two parts I got from MarlinJack fit together with very little
   clearance between the hat and the hole in the restrictor plate:
   I was hoping to not replace the old restrictor plate, but my concern is
   that if the hole in the stock restrictor plate is too small, then the
   new thermostat will not open fully when the larger "hat" does not fit
   into the smaller hole.
   Has anyone seen this problem and have any suggestions?  How does one
   get the old restrictor plate out of the block? It seems to be a press
   fit like a freeze plug and I don't want to cause damage trying to pry
   it out.
   Thanks in advance for your help!
   Dennis