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Old 08-27-2020, 10:24 PM
Danf969 Danf969 is offline
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Default Thermostat location?

I'm looking for confirmation on where the thermostat is installed.

I have a 1966 sprint 6, does the thermostat go first, then the by-pass spacer, then neck?

***OR***

By-pass spacer, thermostat, then the neck?

Thanks for your assistance!!

  #2  
Old 08-28-2020, 06:27 AM
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Jeff Hamlin Jeff Hamlin is offline
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Arrow 1966 WITH BYPASS


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Old 08-28-2020, 09:33 AM
Danf969 Danf969 is offline
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From the 66 tempest shop manual, the only image i can find shows flow direction from the by-pass to the pump. Now according to the image you sent and other similar images i have seen shows the thermostat installed first. So in that configuration and by looking at the shop manual this means that the pump is drawing fluid from the top of the radiator, correct?

This is why I am asking what seems to be a silly question.
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Old 08-28-2020, 10:03 AM
694.1 694.1 is offline
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The pump pulls cool water from the radiator & stuffs it into the block.
The Thermostat actually resides in the Cam cover.
Happy Cammin'!

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Old 08-29-2020, 03:16 PM
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I always have installed the thermostat in the bypass housing on a 66-68 OHC-6 engine, the purpose of the bypass housing is to have a small flow of coolant bypass the thermostat and keep some fluid moving at all times, Putting it before the bypass housing defeats the purpose I think. I have always thought the illistration was wrong in the manual.

But who knows I may have done it wrong for 40 years!

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Old 08-29-2020, 05:20 PM
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Quote:
Originally Posted by camerjeff View Post
I always have installed the thermostat in the bypass housing on a 66-68 OHC-6 engine, the purpose of the bypass housing is to have a small flow of coolant bypass the thermostat and keep some fluid moving at all times, Putting it before the bypass housing defeats the purpose I think. I have always thought the illistration was wrong in the manual.

But who knows I may have done it wrong for 40 years!
I thought the same thing.
What good does the bypass do if it's "after" the thermostat?

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  #7  
Old 08-29-2020, 05:20 PM
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Jeff Hamlin Jeff Hamlin is offline
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Exclamation Stop the press!

You know Jeff I should have caught that, but swung and missed

The recessed Thermostat seat in the Cam House is for non-use of a By-Pass, but PMD realized the need to get a small amount of Coolant to flow before full warm-up.
This is why they used the By-Pass.

The By-Pass also has a recessed seat for the thermostat which is re-located to allow a small amount of flow before the Thermostat reaches operating temp (OPENS).

So the sequence is Cam House, Gasket, By-Pass, Thermostat, Gasket, Outlet.

You would think I could recite this stuff by now
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Old 08-30-2020, 11:31 AM
Danf969 Danf969 is offline
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I've been beating my head against the wall on this stupid little issue... on one hand I have the manual saying one thing, illustrations showing another.

THANK YOU for showing the correct way, and confirming what I thought to be correct.

Time to tear down and reinstall.

Also, thank you for posting on the Cammers Facebook page!

  #9  
Old 08-30-2020, 01:42 PM
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Hey, what's a couple of gaskets among friends

Thank the other Jeff for pointing out the flub.

Cheers.

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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car.
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