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#393900 - 08/19/17 07:22 PM Re: Over Heating engine 38 [Re: 41specialdeluxe]
solafide Offline

Backyard Mechanic

Registered: 11/29/13
Posts: 406
Loc: San Francisco Bay Area
cruised around town for about a half hour, temp sat just below 212 and would go toward 200 when I was rolling at 40mph. No steam, no nothing. She just kept cruising along. I'm still going to do some preventative maintenance on the cooling system anyway. I love driving my 38. I bought a rechargeable round electric fan to keep me cool until I wire my GM fan and Casco fan into the car. Good times

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The Filling Station 1937-42
#394898 - 09/09/17 07:54 AM Re: Over Heating engine 38 [Re: 41specialdeluxe]
solafide Offline

Backyard Mechanic

Registered: 11/29/13
Posts: 406
Loc: San Francisco Bay Area
Too busy to work on her, but I did install new radiator cap (0lbs pressure) and she tended to run hotter. I loosened the cap and she ran cooler, but coolant seemed to boil from loose cap. Just seeing if this narrows possible cause of higher temps.

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#394906 - 09/09/17 03:53 PM Re: Over Heating engine 38 [Re: solafide]
Chev Nut Offline




Registered: 01/08/02
Posts: 24725
Loc: West Allis,Wi.
A pressure cap will not work on a 1938 because the cooling system is vented at the top of the radiator top tank.
Running with or with out a cap will make no difference either for the same reason.
If it could run with a pressure cap it would have no affect on the coolant temperature either.
All the pressure cap will do is raise the coolant boiling point of clear water from 212 degrees at sea level to 220 degrees.
Using a 50/50 antifreeze mixture will raise the boiling point a few more degrees.
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#394998 - 09/12/17 06:51 PM Re: Over Heating engine 38 [Re: Chev Nut]
solafide Offline

Backyard Mechanic

Registered: 11/29/13
Posts: 406
Loc: San Francisco Bay Area
This is the cap I installed from chevofthe40s
https://www.chevsofthe40s.com/detail/5913/Chevrolet_Radiator_Cap.html
Again, seems to increase the engine operating temp.

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#394999 - 09/12/17 07:10 PM Re: Over Heating engine 38 [Re: solafide]
Chev Nut Offline




Registered: 01/08/02
Posts: 24725
Loc: West Allis,Wi.
That is a pressure cap. It will fit on a 1938 radiator but will not hold pressure as the overflow is in the top tank of the radiator. On a 1940 and up the overflow is mounted in the filler nectk and there is a seat on the bottom for the springy thing to seal against.
It also will not work correctly on a 1940-1947 as the filler nect was not designed for a pressure cap. That was a change mde in 1948.
As I mentioned a pressure cap, when it does "work" will not make an engine run any cooler OR HOTTER,. It will only raise the boiling point of the coolant from 212 Deg to 220 Deg.


Edited by Chev Nut (09/12/17 07:11 PM)
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#395034 - 09/13/17 03:59 PM Re: Over Heating engine 38 [Re: Chev Nut]
solafide Offline

Backyard Mechanic

Registered: 11/29/13
Posts: 406
Loc: San Francisco Bay Area
I'm confused. Where can I get the correct cap?
https://www.chevsofthe40s.com/shop/searc...d=KeywordSearch

These caps are described as "non pressure"


Edited by solafide (09/13/17 04:01 PM)

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#395036 - 09/13/17 05:06 PM Re: Over Heating engine 38 [Re: solafide]
Chev Nut Offline




Registered: 01/08/02
Posts: 24725
Loc: West Allis,Wi.
I'm sorry, I confused you. That is the correct no-presure cap.
My error imsorry
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Chevgene

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#395050 - 09/13/17 11:59 PM Re: Over Heating engine 38 [Re: Chev Nut]
solafide Offline

Backyard Mechanic

Registered: 11/29/13
Posts: 406
Loc: San Francisco Bay Area
Phew, I appreciate your expertise. Thanks for the guidance
Michael

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#395063 - 09/14/17 09:36 AM Re: Over Heating engine 38 [Re: solafide]
Chev Nut Offline




Registered: 01/08/02
Posts: 24725
Loc: West Allis,Wi.
To be 100% correct for judging purposes the orignal cap would be flat with no lettering and just a big rivet head in the center.
The "Remove slowly etc." would be only on a pressure cap.
I understand that the judging dosen't intrest you but I do not want to mis=lead any one the wants a original looking car.
_________________________
Chevgene

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#395072 - 09/14/17 12:54 PM Re: Over Heating engine 38 [Re: Chev Nut]
solafide Offline

Backyard Mechanic

Registered: 11/29/13
Posts: 406
Loc: San Francisco Bay Area
That is good to know, where would one find such a cap?

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#395114 - 09/16/17 08:00 AM Re: Over Heating engine 38 [Re: solafide]
solafide Offline

Backyard Mechanic

Registered: 11/29/13
Posts: 406
Loc: San Francisco Bay Area
I had a thought, imagine that? Is it possible my radiator is not venting from "the top" as you say? The cap is a no pressure cap, but the engine temp rises when I install the cap and runs cooler when it is loose. Just wondering?

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#395116 - 09/16/17 10:04 AM Re: Over Heating engine 38 [Re: Chev Nut]
36RAGTOP Offline

Shade Tree Mechanic

Registered: 10/25/15
Posts: 184
Loc: SOUTHERN CALIF
Originally Posted By: Chev Nut

All the pressure cap will do is raise the coolant boiling point of clear water from 212 degrees at sea level to 220 degrees.
Using a 50/50 antifreeze mixture will raise the boiling point a few more degrees.

good info about the 50/50 antifreeze mix
i didnt know that, auto parts stores out here push that 50/50 mix
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#395447 - 09/24/17 05:32 PM Re: Over Heating engine 38 [Re: tonyw]
41specialdeluxe Offline



Registered: 09/14/09
Posts: 4664
Loc: NC usa
Gene is correct in that the higher the altitude above sea level the lower the boiling point. The pressure cap raises the boiling point.

TonyW. is not so correct. The 160/170 temperture thermostad is way too low. You are not getting the best flow (for carrying off frection heat) untile the oil reaches at least 190 or maybe even higher.

What one needs to do is stop thinking about heat as animals experience it but as oil and metal do. The engine heat dosen't bother the engine as much as it would a mule or ... well, um, a kangaroo say. Get the point Tony. Just saying.

Best,
Charlie computer

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#395452 - 09/24/17 06:45 PM Re: Over Heating engine 38 [Re: 41specialdeluxe]
Chev Nut Offline




Registered: 01/08/02
Posts: 24725
Loc: West Allis,Wi.
I would recomend a 160 Deg. thermostat for the older models....that is one area I would not agree with Charlie.
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Chevgene

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#395453 - 09/24/17 07:17 PM Re: Over Heating engine 38 [Re: Chev Nut]
Uncle Ed Offline

1000

Registered: 08/30/06
Posts: 1318
Loc: Iowa
iagree
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#395454 - 09/24/17 07:21 PM Re: Over Heating engine 38 [Re: Uncle Ed]
old216 Offline

1500

Registered: 09/15/02
Posts: 1649
Loc: Bracebridge Ontario,Canada
Regarding the comments about the cap, I recently purchased a new original style radiator for my 38. I was asked whether I would like a pressure style neck and I opted for it. It is possible to buy one of these old cars and end up with a rad that has a pressure style neck.
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My 1951 1 Ton is now on the road! My 38 Master 4 Door is also now on the road .

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#395456 - 09/24/17 08:00 PM Re: Over Heating engine 38 [Re: old216]
Chev Nut Offline




Registered: 01/08/02
Posts: 24725
Loc: West Allis,Wi.
Is the overflow pipe built into the filler neck or in the top of the top tank?
I would think a radiator shop could replace the filler neck to a later style and plug the top tank version if yours is so equipped.
I found that for my '39 the overflow tank was better tnan a pressure cap because the fluid never got lost.
_________________________
Chevgene

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#395463 - 09/25/17 07:47 AM Re: Over Heating engine 38 [Re: Thor38]
timbeilby Offline
Shade Tree Mechanic

Registered: 04/28/09
Posts: 74
Loc: Montana, USA
For what it is worth

On page 170 of the Chevrolet's 1938 Shop Manual.

After reading the shop manual I just replaced my 180 with a 160 as I thought that the 180 was too hot. I was having boil over with the 180.

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#395469 - 09/25/17 10:05 AM Re: Over Heating engine 38 [Re: timbeilby]
Chev Nut Offline




Registered: 01/08/02
Posts: 24725
Loc: West Allis,Wi.
There were no 180 degree thermostats prior to WWII. The winter thermostat prior to that time was a 160 degree.
When using either a 160 Deg. or 180 Deg. Chevrolet advised to use a "permenant" type of antifreeze to reduce boil over or install an overflow tank.
_________________________
Chevgene

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#395492 - 09/25/17 06:13 PM Re: Over Heating engine 38 [Re: Chev Nut]
old216 Offline

1500

Registered: 09/15/02
Posts: 1649
Loc: Bracebridge Ontario,Canada
My new radiator was made to order so the overflow is positioned just like the later ones in the fifties. I don't really intend to pressurize it but I do have the option now.
_________________________
My 1951 1 Ton is now on the road! My 38 Master 4 Door is also now on the road .

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#395506 - 09/26/17 06:15 AM Re: Over Heating engine 38 [Re: old216]
m006840 Offline



Registered: 11/30/02
Posts: 4559
Loc: merrimack nh
If it has the vent above the cap seat I think it will be pressurized.
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Steve D

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