258 temp vs. 4.0 temp - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 12-30-2001, 05:48 PM
wa1
Guest
 
Posts: n/a
258 temp vs. 4.0 temp

I have a question about running tempís for a 1980 258 vs. a 1993 4.0 I did a swap and if I remember right the 258 used to run on the stock gauge at just under the half way mark. Since the swap, (Iím using the same gauge from the 1980 Jeep) the 4.0 runs just above the half way mark. I know that the 4.0 is suppose to run at about 210 degrees Does this sound normal to those of you who have made this swap??

Thanks John


Sponsored Links
Advertisement
 
post #2 of (permalink) Old 12-30-2001, 08:56 PM
 
Join Date: Dec 2000
Posts: 242
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: 258 temp vs. 4.0 temp

So i think, the 4.0 is running on the older gauge? In a cj, with the stock gauge?
If this sounds right then your probably ok. The 258 should probably have run around 185-195, i believe. Whereas your correct about the 242 running at 210.
i would get an after market gauge and be sure.

My Rides
1979 CJ-7: 304, T-150, much is my rebuild
1985 CJ-7: 258, T-5, for Peru Excursion
1989 XJ: has seen every state except Hawaii

In search of lost paths and distant locations...
MyRide is offline  
post #3 of (permalink) Old 12-30-2001, 11:43 PM
Keyboard Implanted
 
Smokngun's Avatar
 
Join Date: Sep 1999
Location: Palmyra, WI
Posts: 2,209
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: 258 temp vs. 4.0 temp

I dont know about the 4.0, but my stock '83 258 runs at 190 when it is blistering hot out, and it creeps up to 180 when it's winter time (like now...it's 6 degrees out). This is on an Auto Meter gauge.


Mike H.
1983 CJ-7 Laredo
Smokngun is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 01-01-2002, 06:04 PM
 
Join Date: Jun 2001
Posts: 1,628
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: 258 temp vs. 4.0 temp

A 4.2 uses a 195 degree thermostat, and a 4.0 is a 192 degree unit. 3 degrees doesn't mean much, So, both engines should run at around 200-215 (210 seems to be the average)
I'd verify the the temp with an accurate thermometer, but chances are your old engine had the wrong thermostat, people love to mess with them. [img]/wwwthreads_images/icons/smile.gif[/img]
Another thought is that you may have a better ground connection now and the guage is now reading normal, but was reading low with the old engine and crappy ground connection.
The halfway point on the guage is about 195, so if it's working correctly, you're probably around 210, which is perfectly normal for a 4.0.

-Derek Schwab
'97 Sidekick Sport
'83 CJ-7
dschwab9 is offline  
post #5 of (permalink) Old 01-01-2002, 06:32 PM
 
Join Date: Sep 1999
Posts: 2,006
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: 258 temp vs. 4.0 temp

Did you by chance change out the sending unit like unit to like gauge. There may be a diff between the 80 and 93 sending units, one is computer linked the other is not. They used both styles in 93 and used only the none linked in 80. By linked the sending unit talks to the computer then the gauge and the other does not. This may or may not be your difference.
GP'n

GP'n is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome