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Unread 06-04-2013, 08:17 PM   #1
upcongang
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258 Overheating

258 Overheating

New head gasket, new water pump, new thermostat, still have the problem.

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Unread 06-04-2013, 08:35 PM   #2
pman
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When are you overheating? Stoplight, highway, etc.

A couple of things to check-
- air in system?
- are you still running the thermal clutch fan (stock)? If so, this may be bad. Had the same problem on my Wagoneer at one point. Even though the fan "tested" fine, it wasn't. New fan dramatically reduced my engine temps.
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Unread 06-04-2013, 09:03 PM   #3
upcongang
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overheat

In less than 3 minutes it will overheat no matter what I'm doing with it. No clutch fan....New head gasket....new thermostat....and burped the system. Coolant system is under a lot of pressure.
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Unread 06-04-2013, 09:08 PM   #4
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Have you checked the timing?

Edit: another thing to check would be incorrect backpressure. Do you have a vacuum gauge?
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Unread 06-04-2013, 09:25 PM   #5
upcongang
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overheating

no. Is it possible to have a cracked head and not have fluids swapping. Such as water in the oil and so on?
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Unread 06-04-2013, 09:28 PM   #6
upcongang
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Timing in on the money. 5 degrees advanced for elavation
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Unread 06-04-2013, 10:35 PM   #7
dirtdudeaz
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Was your motor recently rebuilt/bored or were you just doing the head gasket? Could be generating more heat if it was bored.
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Unread 06-04-2013, 11:21 PM   #8
BagusJeep
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Are you sure it is overheating? The gauges are unreliable and if you have the wrong sensor it can indicate overheating.
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Unread 06-05-2013, 01:06 AM   #9
titomars
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Quote:
Originally Posted by upcongang View Post
no. Is it possible to have a cracked head and not have fluids swapping. Such as water in the oil and so on?
Yes it is possible and likely a cracked head will not dump coolant into the oil.
But a cracked head will not overheat the engine in 3 minutes from cold. It will over pressure the cooling system.

my first guess is either the wrong head gasket or it is on backwards. that's about the only thing that could do it in 3 minutes. Even if the water pump was dead (no belt) it would take about 8 to 10 minutes to get to over heat from cold.
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Unread 06-05-2013, 08:35 AM   #10
Balvar24
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It takes more than 3 minutes for me to reach operating temperature. Sounds like you've got water blocked somewhere. The head gasket thing sounds plausible.

Is the thermostat in backwards?
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Unread 06-06-2013, 09:05 PM   #11
upcongang
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overheating

Well put block sealer in and let set for 24 hrs. Put new bottom hose/w spring in today.......Started it up burped the system and all was good for about 2 hrs....and then...... same old crap started heating up fast. Head gasket on right and it was overhauled before I bought the jeep about two months ago.....Any ideas where to get another head for a 79 258 AMC inline 6 in AZ:
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Unread 06-07-2013, 05:01 AM   #12
Caish
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I agree, I have an air lock.
Remove the temp sensor from the head and fill you'll coolant comes out or you can see it in there.
Should fix the problem....
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Unread 06-07-2013, 07:06 AM   #13
keith460
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Quote:
Originally Posted by Balvar24 View Post
Is the thermostat in backwards?
That would be my guess as well.
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Unread 06-07-2013, 07:10 AM   #14
thompsoj22
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possibly "pumping" air

the fact that block sealer had an effect might indicate that the head is cracked and pumping compression into the cooling system giving you the air pocket. if you have a coolant system pressure tester put it on the radiator cold and start the motor and see if it indicates static pressure simply from starting the motor. another way would be to lower the coolant level in the top tank and run the motor til the thermostat opens and see if the temp stabilizes without overheating, it cant build system pressure without the cap. uh, dont get burned/scalded if it burps when the stat opens.
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Unread 06-07-2013, 12:02 PM   #15
LumpyGrits
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You have a plugged radiator for sure.
You will have to have a 'rod-out' done.
If your using a fan clutch. Make sure yours is built to turn the correct rotation for your engine set up.
LG
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