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Temp gauge hook up late 70s cj7 258 6cylinder

I recently rebuilt a 258 engine for my 85 cj7. I used an earlier model engine for the rebuild. I think it is a 78 dont know for sure. the problem is that my engine temp wire hooked up on the top back drivers side of the head on all other jeeps except my late 70s engine. I need to know where the temp reading is on earlier model cj7

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Wherever you can find a threaded port in the cooling system should work,as long as it is the same thread as your sending unit.If you cannot find a compatible threaded port,you may have to go to a hardware store and find some fittings that will adapt your sending unit to whatever threaded port is available.If you can not find one,most engine blocks have two (one on each side) threaded plugs for the water jacket.If you have to,locate the sending unit there with appropriate adapters.And as a last resort,you could purchase an aftermarket temp gauge and use it,as it comes with an assortment of adapters/fittings.

Posted on Jul 19, 2008


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Posted on Jan 02, 2017


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How do you read the temperature of engine. Thanks

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Now if you have determined that your engine is worn out, you must make some decisions. The question of whether or not an engine is worth rebuilding is largely a subjective matter and one of personal worth. Is the engine a popular one, or is it an obsolete model- Are parts available- Will it get acceptable gas mileage once it is rebuilt- Is the car it's being put into worth keeping- Would it be less expensive to buy a new engine, have your engine rebuilt by a pro, rebuild it yourself or buy a used engine from a salvage yard- Or would it be simpler and less expensive to buy another car- If you have considered all these matters, and have still decided to rebuild the engine, then it is time to decide how you will rebuild it.
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Temperature gauge quit where is the sensor and how do I check if its the sensor or the gauge?

you have to be specific in the tear ,make,model of the vehicle
some engines use a temp sender unit as well as a temp sensor unit
check around the outlet area of the head and if you find a small sender with one wire to it then remove the wire and place it on the head
turn on the ignition and if the gauge immedately goes to hot , turn of the ignition switch and replace that sender
some late model engines use a sensor for two purposes
1 to tell the ecm when to turn on the fans and
2 to have the ecm show the coolant temp on the gauge
if in doubt have an accredited auto electrician check it for you

Apr 22, 2015 | Cars & Trucks

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My trucks temp gauge stays cold mostly unless in 4th-5th gear?

do you have a coolant thermostat fitted if not this can make your temp gauge unstable as the stat should not let water though until normal temp is achieved if this is all in order a water pressure test may be needed to check that the head gasket is not letting compression gasses into the water jacket

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I have a automatic 1999 pontiac grand am gt. the car and drives good until it heats up. then the gears shift extremely hard. and when sitting in idle you can hear a loud winding noise coming from my...

Check the transmission fluid level. Also check the rear differential if your car has one ( I think the 99's were still rear wheel drive) for fluid. If either of these are low, the fact that things are fine indicates that the low fluid level is causing problems. Also, the trans fluid should be a nice pink color. If it isn't then the transmission is not in good shape and should be looked at again by the rebuilder. If the fluid levels are fine, have the rebuilder check the trans again to see if he missed something.

The issue with the temp gauge is entirely separate except if you mean that the car begins to heat up when the shifting problems are occurring. If the temp gauge goes way up then comes down quickly regardless of how the car is being driven, the thermostat may be sticking and should be replaced. If the car is hard to drive and then starts overheating, the transmission may well be defective and causing the engine to work harder than it should.

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