Subject: [TR] Morgan/TR3 Thermostat Housing Bypass

From: "Bill Brewer" <[email-masked]>
Date: Sat, 6 Oct 2018 15:37:11 -0700

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     On my 1953 Morgan +4 I installed a recirculation hose block-off =
where
it goes back in the water pump. I did the same thing on my TR3 a 20 =
years
ago based on a tip from Bob Schaller=92s booklet =93More BS About =
Triumphs=94. On
the Morgan I turned down a =BD=93 long brass cylinder and put a 1/8=94 =
hole in the
center of it. Worked great on the TR3. It prevents unnecessary =
recirculation
when using a conventional thermostat instead of the sleeved type. =
Anyway, it
worked on the Morgan (vary similar to the TR engine) until I discovered =
the
fan belt was loose. I tightened the belt and bam! It blew out the gasket
between the two thermostat housings when cold. I lapped the two =
thermostat
housings, installed a new conventional thermostat and bam! It blew off =
the
bypass hose. No matter how much I tightened the hose clamp it still =
leaks. I
put on a new hose and it still dribbles.

     Something tells me that the water pump is pumping too hard against =
the
closed thermostat when the car is cold. I could spring for a $115 =
sleeved
thermostat from Moss, but would rather continue using a modern =
conventional
thermostat.

     Anyone else have issues like this? Any ideas?

     TIA,

=20

     -Bill in Tehachapi

=20

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size=3D3 face=3DCalibri><span style=3D'font-size:12.0pt'>=A0=A0=A0=A0 On =
my 1953 Morgan +4 I installed a recirculation hose block-off where it =
goes back in the water pump. I did the same thing on my TR3 a 20 years =
ago based on a tip from Bob Schaller&#8217;s booklet &#8220;More BS =
About Triumphs&#8221;. On the Morgan I turned down a =BD&#8220; long =
brass cylinder and put a 1/8&#8221; hole in the center of it. Worked =
great on the TR3. It prevents unnecessary recirculation when using a =
conventional thermostat instead of the sleeved type. Anyway, it worked =
on the Morgan (vary similar to the TR engine) until I discovered the fan =
belt was loose. I tightened the belt and bam! It blew out the gasket =
between the two thermostat housings when cold. I lapped the two =
thermostat housings, installed a new conventional thermostat and bam! It =
blew off the bypass hose. No matter how much I tightened the hose clamp =
it still leaks. I put on a new hose and it still =
dribbles.<o:p></o:p></span></font></p><p class=3DMsoNormal><font =
size=3D3 face=3DCalibri><span style=3D'font-size:12.0pt'>=A0=A0=A0=A0 =
Something tells me that the water pump is pumping too hard against the =
closed thermostat when the car is cold. I could spring for a $115 =
sleeved thermostat from Moss, but would rather continue using a modern =
conventional thermostat.<o:p></o:p></span></font></p><p =
class=3DMsoNormal><font size=3D3 face=3DCalibri><span =
style=3D'font-size:12.0pt'>=A0=A0=A0=A0 Anyone else have issues like =
this? Any ideas?<o:p></o:p></span></font></p><p class=3DMsoNormal><font =
size=3D3 face=3DCalibri><span style=3D'font-size:12.0pt'>=A0=A0=A0=A0 =
TIA,<o:p></o:p></span></font></p><p class=3DMsoNormal><font size=3D3 =
face=3DCalibri><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p><p =
class=3DMsoNormal><font size=3D3 face=3DCalibri><span =
style=3D'font-size:12.0pt'>=A0=A0=A0=A0 -Bill in =
Tehachapi<o:p></o:p></span></font></p><p class=3DMsoNormal><font =
size=3D3 face=3DCalibri><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p></div></bod=
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From: "Randall" <[email-masked]>
Date: Sun, 7 Oct 2018 11:07:36 -0500

>      Something tells me that the water pump is pumping too 
> hard against the closed thermostat when the car is cold. I 
> could spring for a $115 sleeved thermostat from Moss, but 
> would rather continue using a modern conventional thermostat.
> 

What I did was to drill a 5/16" hole through the backing plate of the
thermostat.  It slows down engine warm-up a bit; but ensures that all of the
coolant flows through the radiator (if you also block off the bypass).

But my tests showed no discernable difference with the bypass either blocked
or open, so now I leave it open.  And the thermostat eventually got replaced
as well.  So no more hole (and no more problems with overheating after
finally having the radiator recored).

-- Randall