Go Back   Corvette Forum > C3 Corvettes, 1968 - 1982 > C3 Tech/Performance
Sign in using an external account
Register Forgot Password?
Register Search Today's Posts Mark Forums Read FAQ Vendor Directory
Search
C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette Sponsored by
VBP

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C7 Parts & Accessories
C6 Parts & Accessories
C5 Parts & Accessories
C4 Parts & Accessories
C3 Parts & Accessories
C2 Parts & Accessories
C1 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 04-02-2009, 04:27 PM   #1
QuicheLorraine
CF Senior Member
 
Member Since: Feb 2009
Location: San Diego CA
Default Coolant temp sensor AFR heads?

For those who have them, what sensor did you use that works with the stock gauge? My new AFR195's have too small a hole in the side for either the plug that came out of the right head, nor the coolant temp sensor that came outta the left head.
QuicheLorraine is offline   Reply With Quote
Old 04-02-2009, 04:43 PM   #2
windup
CF Senior Member
 
windup's Avatar
 
Member Since: Mar 2007
Location: London
Default

The one from an 82 crossfire fits I think.
windup is offline   Reply With Quote
Old 04-02-2009, 04:52 PM   #3
Gordonm
CF Senior Member
 
Gordonm's Avatar
 
Member Since: Dec 1999
Location: Voorhees NJ
Default

Yes this is a big problem with newer heads. I know there are a lot of guys working on this and trying to come up with a solution. I did find a sensor working with my parts guy a number of years ago. Unfortunatly I did not write down what it was for or any numbers. It is very close on the temp readings. Not perfect but good enough. I know this does not help but there are people working on this. Some have tried to turn down the big sensor to the correct thread size.
Gordonm is offline   Reply With Quote
Old 04-02-2009, 05:35 PM   #4
QuicheLorraine
CF Senior Member
 
Member Since: Feb 2009
Location: San Diego CA
Default

Quote:
Originally Posted by Gordonm View Post
Yes this is a big problem with newer heads. I know there are a lot of guys working on this and trying to come up with a solution. I did find a sensor working with my parts guy a number of years ago. Unfortunatly I did not write down what it was for or any numbers. It is very close on the temp readings. Not perfect but good enough. I know this does not help but there are people working on this. Some have tried to turn down the big sensor to the correct thread size.
Can't turn down the big one - the bulb doesn't even fit the hole, let alone the threads!

And it kills me too because the temp gauge was perfectly accurate before.
QuicheLorraine is offline   Reply With Quote
Old 04-02-2009, 05:35 PM   #5
7t2vette
The ORIGINAL and bestest
Toronto Events Coordinator
Support Corvetteforum!
 
7t2vette's Avatar
 
Member Since: Oct 2000
Location: Toronto
Default

I may have the easiest solution of all: I drilled mine out and tapped them for 1/2" NPT to be able to use the stock sensor.

Last edited by 7t2vette; 04-02-2009 at 07:03 PM.
7t2vette is offline   Reply With Quote
Old 04-02-2009, 06:30 PM   #6
Gordonm
CF Senior Member
 
Gordonm's Avatar
 
Member Since: Dec 1999
Location: Voorhees NJ
Default

Look at these sensors. The fat one iwould say would not fit but that is not for your year car. The one with the thinner "bulb" should be the one and that one should be able to be turned down.

http://www.zip-corvette.com/Zip/dept.asp?dept_id=2222
Gordonm is offline   Reply With Quote
Old 04-02-2009, 07:02 PM   #7
JimT
CF Senior Member
 
JimT's Avatar
 
Member Since: Nov 2006
Location: Cumming Georgia
Default

You can purchase a short 3/8" nipple, and a 3/8" X 1/2" adapter (all NPT pipe fittings from Home Depot). Insert the adapter and nipple into the head, then insert 1/2" sensor into the adapter. Works rather well.
JimT is offline   Reply With Quote
Old 04-02-2009, 07:14 PM   #8
74ZZ430
CF Senior Member
 
Member Since: Aug 2000
Location: Toledo,Ohio,USA
Default

I had the same problem on my 74 when I replaced the heads. The bulb on the sensor was to large to get a 3/8" die over. I purchased a new stock sensor from Lectric Limited which had a much smaller bulb and had the new sensor turned down, works perfect..
74ZZ430 is offline   Reply With Quote
Old 04-02-2009, 09:00 PM   #9
C3 Stroker
CF Senior Member
 
C3 Stroker's Avatar
 
Member Since: Oct 2004
Location: Youngstown Ohio
Default

You can have the hole machined out to accept the stock sensor, or do as I did.....locate the sensor to the intake manifold; it fits perfectly and is just as accurate there.

FYI, Readers ....If you order your heads from AFR, they told me the will drill the correct size hole for your sensor; just be sure to mention it when you order. Ken
C3 Stroker is offline   Reply With Quote
Old 04-02-2009, 11:32 PM   #10
Willcox Corvette
Premium Supporting Vendor
St. Jude Donor '08-'09-'10-'11-'12-'13-'14
 
Willcox Corvette's Avatar
 
Member Since: Aug 2006
Location: Jeffersonville Indiana 812-288-7103
https://www.facebook.com/WillcoxCorvette
Send a message via MSN to Willcox Corvette
Default

Just two days ago I was working on this for 77 Sleeper.

What I’m doing is turning his original sending unit down in my lathe and then threading it to 3/8 npt.

For those with a lathe, this can be done in about hours time and you would be ready to go. There is enough material in the threaded area to allow the old threads to be taken off and new threads cut. If you do this you have to be real careful, the jaws of your chuck can severally mar the hex head of the sending unit. I like to gorilla things so on my first there are pretty good marks on it. This test unit was the thumb nail sending unit and not the spaded one. . . But it is for sale too. . . You can order this one by calling sales if anyone wants it. I’ll let it go for the standard price of the sender I used.

Now for the time eating part of this post! ! ! . . . we have it turned down and ready to go but we are also going to match calibrate to his temperature gauge (dash unit) to the ohms output of the sending unit. This should produce a very accurate dash reading when completed. It takes me over an hour to do this but it is well worth it.

I can’t get this done for Sleeper until this weekend, tomorrow I’m subbing at the office for Tommy who has the day off so about the only thing I can do tomorrow would be take a picture of the smaller sending unit. (I polished the top of Sleepers, it looks like gold now).

Willcox Inc.
Willcox Corvette is offline   Reply With Quote
Old 04-03-2009, 01:45 AM   #11
QuicheLorraine
CF Senior Member
 
Member Since: Feb 2009
Location: San Diego CA
Default

Quote:
Originally Posted by Willcox Corvette View Post
Just two days ago I was working on this for 77 Sleeper.

What Im doing is turning his original sending unit down in my lathe and then threading it to 3/8 npt.

For those with a lathe, this can be done in about hours time and you would be ready to go. There is enough material in the threaded area to allow the old threads to be taken off and new threads cut. If you do this you have to be real careful, the jaws of your chuck can severally mar the hex head of the sending unit. I like to gorilla things so on my first there are pretty good marks on it. This test unit was the thumb nail sending unit and not the spaded one. . . But it is for sale too. . . You can order this one by calling sales if anyone wants it. Ill let it go for the standard price of the sender I used.

Now for the time eating part of this post! ! ! . . . we have it turned down and ready to go but we are also going to match calibrate to his temperature gauge (dash unit) to the ohms output of the sending unit. This should produce a very accurate dash reading when completed. It takes me over an hour to do this but it is well worth it.

I cant get this done for Sleeper until this weekend, tomorrow Im subbing at the office for Tommy who has the day off so about the only thing I can do tomorrow would be take a picture of the smaller sending unit. (I polished the top of Sleepers, it looks like gold now).

Willcox Inc.
Well I have verified over & over again, that my temp sensor was accurate using radar guns at radiator shops & repair places. Amazing as it is, my '76 dash gauge is accurate from 180* to 210* within a very small degree of error.

If you were to turn the sensor down & make it 3/8NPT thread, there would be no reason to test it - it's already accurate but doesn't fit the hole.
QuicheLorraine is offline   Reply With Quote
Old 04-03-2009, 01:30 PM   #12
Vette79C3
CF Senior Member
 
Vette79C3's Avatar
 
Member Since: Jul 2008
Location: Millersville Maryland
Send a message via AIM to Vette79C3 Send a message via Yahoo to Vette79C3
Default

Quote:
Originally Posted by C3 Stroker View Post
You can have the hole machined out to accept the stock sensor, or do as I did.....locate the sensor to the intake manifold; it fits perfectly and is just as accurate there.

FYI, Readers ....If you order your heads from AFR, they told me the will drill the correct size hole for your sensor; just be sure to mention it when you order. Ken
As Ken mentioned you could have had them drill the correct size hole prior to shipment. I also forgot this prior to shipment. I went through three different sensors until I found one that was spot on with my gauge. Keep in mind that your sensor is in tune with your gauge. I couldn't use an adapter because my headers were in the way. Relocating it on top of the intake is an option but to me looked silly and out of place. Personal Preference. If your not having any luck I could locate the part number for you.
Vette79C3 is offline   Reply With Quote
Old 04-03-2009, 01:38 PM   #13
QuicheLorraine
CF Senior Member
 
Member Since: Feb 2009
Location: San Diego CA
Default

Quote:
Originally Posted by Vette79C3 View Post
As Ken mentioned you could have had them drill the correct size hole prior to shipment. I also forgot this prior to shipment. I went through three different sensors until I found one that was spot on with my gauge. Keep in mind that your sensor is in tune with your gauge. I couldn't use an adapter because my headers were in the way. Relocating it on top of the intake is an option but to me looked silly and out of place. Personal Preference. If your not having any luck I could locate the part number for you.
Thanks for that. Right now there's another stumbling block keeping me from firing the motor: See my thread about the bad (possibly) guide plate in the head. Need to get that corrected before any other things get installed.
QuicheLorraine is offline   Reply With Quote
Old 04-04-2009, 09:48 AM   #14
carriljc
CF Senior Member
 
carriljc's Avatar
 
Member Since: Jan 2001
Default Located in Intake & is not accurate

I have mine located on the intake manifold and it is nowhere near accurate.
I have a separate sensor that goes to the ECM and my gauge reads about ~40F colder(from memory & gauge markings aren't exactly clear) than the computer ECM...both are on the Intake manifold. The ECM reads where I would expect with my 180F thermostat.
I'm going to have to try the adapter thing ...

Last edited by carriljc; 04-04-2009 at 09:50 AM.
carriljc is offline   Reply With Quote
Old 04-04-2009, 10:28 AM   #15
QuicheLorraine
CF Senior Member
 
Member Since: Feb 2009
Location: San Diego CA
Default

Quote:
Originally Posted by carriljc View Post
I have mine located on the intake manifold and it is nowhere near accurate.
I have a separate sensor that goes to the ECM and my gauge reads about ~40F colder(from memory & gauge markings aren't exactly clear) than the computer ECM...both are on the Intake manifold. The ECM reads where I would expect with my 180F thermostat.
I'm going to have to try the adapter thing ...
Yesterday I bought a 3/8 NPT nipple & a reducer. Two problems: First, the big sensor won't thread all the way down into the reducer. Secondly the arrangement would have hit the header.
QuicheLorraine is offline   Reply With Quote
Old 04-04-2009, 10:38 AM   #16
jbowles49
CF Senior Member
 
jbowles49's Avatar
 
Member Since: Jul 2007
Location: Price Utah
Default

I tried this nipple and reducer setup many years ago for a similar problem and it was not far enough into the water flow to be accurate. Glad you resolved the guide plate issue with Motorhead. It looks acceptable to me too based on your pics and efforts at finetuning. Good luck
jbowles49 is offline   Reply With Quote
Old 04-04-2009, 10:42 AM   #17
gkull
CF Senior Member
 
gkull's Avatar
 
Member Since: Apr 1999
Location: Reno Nevada
Default

Put your stock sensor in the intake manifold next to the goose neck.

Or you can buy the Volvo sensor that fits AFR heads that has the same ohm rating as the Vette sensor from Pep boys

No machining or dicking around!
gkull is offline   Reply With Quote
Old 08-31-2009, 10:35 AM   #18
carriljc
CF Senior Member
 
carriljc's Avatar
 
Member Since: Jan 2001
Default What Volvo yr & model for temp sender?

I'm ready to try this. anybody know the particulars?
carriljc is offline   Reply With Quote
Old 08-31-2009, 12:19 PM   #19
rcread
CF Senior Member
 
rcread's Avatar
 
Member Since: Aug 2004
Location: Kenmore WA
Default

I dropped my head off at NAPA, had them drill and tap the hole, and picked it up in the afternoon. $25 later, it was a perfect fit.
rcread is offline   Reply With Quote
Old 08-31-2009, 12:19 PM
 
Go Back   Corvette Forum > C3 Corvettes, 1968 - 1982 > C3 Tech/Performance
Reload this Page Coolant temp sensor AFR heads?
 
 
 
Reply

Tags
84, afr, c4, c5, coolant, corvette, forum, heads, replacement, sending, sensor, temp, temperature, test, unit, vette, volvo


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Stripped Coolant Temperature Sensor ryccoh C6 Tech/Performance 1 03-22-2014 05:49 PM
Coolant Temp Sensor for 77 iwasmenowhesgone C3 Tech/Performance 5 02-14-2014 08:22 AM
Shorter coolant temp sensor available? littleredcorvette88 C4 Tech/Performance 2 03-04-2013 07:45 AM
Coolant temp sensor with vortec heads Camivette C3 Tech/Performance 20 08-25-2012 09:24 AM
94 lt1 runs rough after coolant/temp sensor change fueler C4 General Discussion 6 10-10-2006 07:32 AM


All times are GMT -4. The time now is 12:57 PM.


Emails & Password Backup