Thermostat questions - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 09-27-2004, 02:00 PM
suck, squeeze, bang, blow
 

Last journal entry: finally reeled it in
Last photo:
Join Date: Jul 2004
Location: Ontario, Canada
Age: 41
Posts: 169
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thermostat questions

Flyfisher and his mighty misdiagnosis:
So I was out 4X4 ing on Saturday with a friend and his 2002 Jeep. (the wife wouldn't let me take hers ) We were mudding around for about 3 hours got it stuck a bunch of times, you know the usual stuff. As we left the mud hole and got on the road, the Jeep overheated. I was convinced it was the thermostat. We got it towed the two hours to my shop and on Sunday I changed the thermostat. Still overheated. I noticed the rad was plugged solid with mud from the engine side and took the next 15 minuites to clean it with a power washer. Seems to be fine now, but I have a question regarding thermostats.

I replaced the stock one with a fail-safe thermostat, but it doesn't have the little ball checked valve orfice above the actual valve like the stock one. Is this a valve to eliminate air and possible cavitation in the system or what purpose does it serve? Is there any danger to replacing it with a thermostat without this tiny passage? Finally, why don't fail-safe thermostats come stock with all vehicles?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-27-2004, 05:28 PM
Member
 

Last journal entry: JB's 37 Pickup
Last photo:
Join Date: Oct 2002
Location: Smoky Mountains
Age: 75
Posts: 2,358
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Hmmmn, I thought the fail safe feature was the little ball check valve. If you installed a fail safe thermostat without one, what makes it fail safe? Sounds like the old "right box, wrong part" trick we see more and more from the cheap overseas labor that hasn't got a clue as to what is is going in the box. The fail safe thermostat is for motors that do not have a by pass hose, such as most Small block Chevys. I have alwas made mine fail safe with three 3/32 holes in the flange of the stat. Don't worry about it in my little 289 powered Bronco.

Trees
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-27-2004, 09:18 PM
5.0 freak's Avatar
Member
 
Last photo:
Join Date: Aug 2004
Location: Kelowna, B.C. Canada
Age: 31
Posts: 81
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Man 4x4ing is fun.. especially mudding. My friend has a 2000 Jeep and when we go mudding it always over heats. So he took it to his dads shop who is a GM mechanic and had him look at it. The problem wasn't the thermostat. It was all the mud caked onthe bottom and sides of the engine. It actually keeps the heat in puts a lot of stress on the engine. We actually spray the sides and under the engine with a PAM cooking spray so the mud won't stick. Beleave it or not it actually works pretty good.

James
- Drive it like it's stolen -
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-28-2004, 02:54 PM
suck, squeeze, bang, blow
 

Last journal entry: finally reeled it in
Last photo:
Join Date: Jul 2004
Location: Ontario, Canada
Age: 41
Posts: 169
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I'll try the pam trick. When I go mudding, I usually go close to home so I can wash the engine after it cools. This time we were about an hour from home (two hours by tow truck). The truck started pinging about an hour or two into the forray, probably for the mud caking on the engine as you suggest.

The fail safe thermostat has two brass pieces that hold the valve in place I would assume (I've never had one fail) that they give way (either by pressure or temperature or both) and force open a second valve surrounding the main valve, allowing coolant to pass. Once the second valve opens, the thermostat is junk, but it fails open so the temperature gauge will read cold rather than result in an overheat condition. It's a pretty nifty idea. I can appreciate drilling holes in the thermostat but wouldn't that result in a longer warm up time? If the stat were to fail closed, wouldn't it still overheat?

Thanks for the info. I'm still wondering about the ball check valve, the ball is on the engine side of the stat and therefore would not allow coolant to pass while the engine is running/hot. It seems to be a valve to allow coolant to pass when the engine is on cool down, more like a refil for air pockets that may have developed in the head. It's a directional stat, the ball check valve is on the top of the stat and the stat is marked "top".
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-28-2004, 03:21 PM
docvette's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 61
Posts: 7,362
Wiki Edits: 12

Thanks: 0
Thanked 6 Times in 3 Posts
Fail safe

[size=3]Doc here

I install Fail-safes on all the Vettes, mine (Napa Auto parts) have the little brass ratchet looking linkage on the top side, that ratchet up and lock when Failed..

I think Fail safes are relatively New, and Car manufactures are like the F.A.A. ... It takes years of testing, mounds of paperwork, and an act of god ... To Officially make it a good idea...Besides...they have all those Head/rebuild gaskets to still sell...wouldn't want to cut that market too quick..LOL

The little "Ball" you are talking about, I think, does the same thing as Drilling holes in the Stat...EXCEPT the ball acts as a one way pressure valve, allowing flow in one direction, into the block. Where the stat, with holes in it, will allow back-pressure and boil over easier into the top hose, in a "Locked closed" position.

The PAM idea is a good one on not only the radiator/engine, but on the rims, fender-wells and anything you want to easily clean off after mudding...you can use WD 40 , house wax just about any thing oil based,that won't stick,stain or burn...makes clean up simple!

Doc
[/size]
__________________
Aftermarket Solutions
Electronic & Electrical
Innovations
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-29-2004, 01:21 PM
suck, squeeze, bang, blow
 

Last journal entry: finally reeled it in
Last photo:
Join Date: Jul 2004
Location: Ontario, Canada
Age: 41
Posts: 169
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It must take a long time, I used my first one in or around '92.

I'm wondering if I should pull out the fail safe stat and drill a hole in the top of it.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 05:41 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.