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Unread 03-22-2014, 02:21 PM   #1576
Matt1981CJ7
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Fred,

Do you have an IR thermometer? If so, take some readings around the thermostat housing and the radiator. At least that will confirm whether you have an overheating problem, or if it's just a defective gauge.

I have the opposite problem at the moment. It's a chilly 20 degree day, today. I just took my Ol' Girl for a 30 minute drive and noticed the factory gauge barely got to the green line. My IR thermometer confirmed the gauge is accurate. It measured only 136 degrees at the t-stat housing. Normally it's right around 190. I suspect my t-stat is stuck in the fully open position. We'll see.

Matt

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Unread 03-22-2014, 02:25 PM   #1577
FLynes
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No, I don't have an IR thermometer, Matt. I did pop the top on the rad and it's not bubbling and I can tell when the new thermostat opens and closes, so I'm not particularly worried about overheating, but I would like to know why the gauge is reading hotter than it should. I might take the speedo out and swap in another gauge to see if there's a difference....I have two or three others.
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Unread 03-22-2014, 02:32 PM   #1578
seabass1858
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you could verify the temperature with a mechanical gauge which is what i did for my oil pressure
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Unread 03-22-2014, 02:39 PM   #1579
FLynes
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What is the proper running temp for a 258? My '79 L-82 Vette normally ran at 205°.
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High Plains Drifter
1976 CJ-5
Lime Green
Black Wellington Vinyl Bench Seats
258 I-6 1bbl
T-150 3-Speed
3.54:1 Open Gears

Grammar Test
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Unread 03-22-2014, 02:44 PM   #1580
seabass1858
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i would say 195-210 range
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Unread 03-22-2014, 02:49 PM   #1581
Matt1981CJ7
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Engine temps will vary depending where you take the reading. It's my understanding the engine should operate right around the t-stat rating, measured at the top hose connection to the radiator.

Matt
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Unread 03-22-2014, 08:58 PM   #1582
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On Clay's '79 258, and on my '85 258, there is a port on the pass side of the block for the temp sending unit... if that's what you were talking about the boss not being tapped? I'm guessing you have the same port??

What is an elevator bolt??
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Unread 03-22-2014, 09:17 PM   #1583
FLynes
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Quote:
Originally Posted by Skerr View Post
On Clay's '79 258, and on my '85 258, there is a port on the pass side of the block for the temp sending unit... if that's what you were talking about the boss not being tapped? I'm guessing you have the same port??

What is an elevator bolt??
I didn't take a look at the passenger side, but the temp wire goes right to the front, so I'm assuming that the sender is where it's supposed to be. I'll take a look tomorrow.

An elevator bolt is a round disc with a bolt welded to it, square at the base of the disc. I found mine at the local Fastenal store...the 5/16"-20 was a perfect fit for the track, but the 1/4"-20 was just a tad short....here's a pic.

Also, I don't know how I did it, but I took the speedo apart, took the temp gauge apart, blew on it and cleaned the thin resistor wires, put everything back together and the gauge is reading perfectly normal now.
standard.jpg

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Retired Army Guy

High Plains Drifter
1976 CJ-5
Lime Green
Black Wellington Vinyl Bench Seats
258 I-6 1bbl
T-150 3-Speed
3.54:1 Open Gears

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Unread 03-23-2014, 01:46 PM   #1584
FLynes
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Are the admins screwing with the site? I've lost my avatar, even though it shows in my options that it's there.
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Fred
Retired Army Guy

High Plains Drifter
1976 CJ-5
Lime Green
Black Wellington Vinyl Bench Seats
258 I-6 1bbl
T-150 3-Speed
3.54:1 Open Gears

Grammar Test
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Unread 03-23-2014, 01:53 PM   #1585
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Quote:
Originally Posted by FLynes
Are the admins screwing with the site? I've lost my avatar, even though it shows in my options that it's there.
I see it on my end.
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Unread 03-23-2014, 03:10 PM   #1586
Guy Smilie
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Quote:
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I see it on my end.
I don't see it.
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Unread 03-23-2014, 03:21 PM   #1587
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Quote:
Originally Posted by Guy Smilie
I don't see it.
maybe it's the app versus the web?? I also see my avatar, but I didn't renew my subscription, so it shouldn't be there.

image-1793349822.jpg
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Unread 03-23-2014, 04:07 PM   #1588
FLynes
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I see it on the app, but not the web.
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Fred
Retired Army Guy

High Plains Drifter
1976 CJ-5
Lime Green
Black Wellington Vinyl Bench Seats
258 I-6 1bbl
T-150 3-Speed
3.54:1 Open Gears

Grammar Test
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Unread 03-23-2014, 05:55 PM   #1589
Skerr
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I don't see your avatar. Check your PMs and see if you are limited to to 10. If you are then your membership "expired". I got bumped, twice! It got fixed both times, with Eddie's help.

So, an elevator bolt is the same as a carriage bolt?

And when I was talking about the port for the temp on the pass side of the block, I was talking mechanical gauge. Not sure why I thought you were going that way??
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Unread 03-23-2014, 07:48 PM   #1590
FLynes
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Quote:
Originally Posted by Skerr View Post
I don't see your avatar. Check your PMs and see if you are limited to to 10. If you are then your membership "expired". I got bumped, twice! It got fixed both times, with Eddie's help.

So, an elevator bolt is the same as a carriage bolt?

And when I was talking about the port for the temp on the pass side of the block, I was talking mechanical gauge. Not sure why I thought you were going that way??
It was the membership....never got a message for renewal though, weird.

My understanding is that carriage bolts have more of a rounded headed, vice the elevator bolt, which has a flat head.

No, electrical gauge is what I'm using.
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Fred
Retired Army Guy

High Plains Drifter
1976 CJ-5
Lime Green
Black Wellington Vinyl Bench Seats
258 I-6 1bbl
T-150 3-Speed
3.54:1 Open Gears

Grammar Test
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