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Old 01-02-2013, 10:24 AM
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cjarcher cjarcher is offline
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freeze plug style engine block heater w/ pics

I just installed a block heater in my 258. It is the kind that replaces a freeze plug. For those who don't know, a freeze plug is a metal disc pressed into the engine block that is designed to pop out and prevent the engine from cracking in the event the coolant freezes. On the 258 it is 2" in diameter and located in a somewhat inconvenient spot below the manifold. I ordered the heater from my local auto value for $30. For some reason the sizes are in metric and it is a 51mm. I got it just in time for our first sub-zero night here in Michigan. When I went to start my truck at 5am it was 4° F outside and my temperature gauge was just shy of the green zone. When I pulled out the driveway the heater was blowing hot air. I've had the type of engine block heater which ties into the radiator hose and it doesn't keep the motor nearly this warm. The best part of it is it only draws 75 watts so it won't make my electric bill insane like the 400w magnetic heater I was using before.


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'85 Grand Wagoneer
'16 JK 2 Door, 6 speed (sold)
'82 J10, 258, tf904, np208, 2.73 (sold)
'96 ZJ 5.2 (sold)
'98 ZJ 4.0 (sold)
'76 CJ5 232 (sold)

Last edited by cjarcher : 01-02-2013 at 10:34 AM.
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Old 01-02-2013, 12:01 PM
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Mmm, 75 watts ? sorry maybe 750W but 75W is not enough energy to make much of a Delta T.
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Old 01-02-2013, 12:48 PM
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Quote:
Originally Posted by mdill
Mmm, 75 watts ? sorry maybe 750W but 75W is not enough energy to make much of a Delta T.

The documentation doesn't provide watts but it does say it draws .65 amps so I just multiplied that by 120v in my head. W=(v)(a) if I remember correctly.
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'85 Grand Wagoneer
'16 JK 2 Door, 6 speed (sold)
'82 J10, 258, tf904, np208, 2.73 (sold)
'96 ZJ 5.2 (sold)
'98 ZJ 4.0 (sold)
'76 CJ5 232 (sold)
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Old 01-02-2013, 12:57 PM
hookedup50 hookedup50 is offline
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X2 on the 750 watts looks like the unit on my 6.5 diesel. I believe that is a 1500w though. I use the magnetic oil pan heater also as I prefer warm oil circulating on start up, but just my opinion.
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Old 01-02-2013, 12:57 PM
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If that is what is says, I have never seen any of the heaters with such a low rating. I wonder if the doc. slipped a decimal point.

Quote:
Originally Posted by cjarcher
The documentation doesn't provide watts but it does say it draws .65 amps so I just multiplied that by 120v in my head. W=(v)(a) if I remember correctly.
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1977 J-10 Honcho 360-T15-D20
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Old 01-02-2013, 01:49 PM
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Is the V8 s the same size?
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Old 01-02-2013, 01:58 PM
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That will suck some juice. I would suggest making sure your coolant is good for the temps you will be seeing and not relying on that heater to keep it from freezing. Then put that heater on a timer set to go off a couple hours before you need to leave in the morning. It will warm things up enough to make starting easier and warm up quicker. That's how I used the one in my old '92 Cummins. Did it need it? No. But it sure made it start easier and idle smoother a lot sooner and it was only in use for 2 hours every morning.
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Old 01-02-2013, 02:24 PM
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Upon testing with a multimeter the doc slipped a decimal so it draws 780 watts, which I am pretty disappointed in. Now that I know that I almost wish I stuck with the magnetic heater. I'm happy I have something permanently mounted though and as warm as the oil pan feels I think it is warming my oil too through conduction. Thanks for the advice on the timer. That is a great idea.
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'85 Grand Wagoneer
'16 JK 2 Door, 6 speed (sold)
'82 J10, 258, tf904, np208, 2.73 (sold)
'96 ZJ 5.2 (sold)
'98 ZJ 4.0 (sold)
'76 CJ5 232 (sold)
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  #9  
Old 01-02-2013, 03:36 PM
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Quote:
Originally Posted by cjarcher
Upon testing with a multimeter the doc slipped a decimal so it draws 780 watts, which I am pretty disappointed in. Now that I know that I almost wish I stuck with the magnetic heater. I'm happy I have something permanently mounted though and as warm as the oil pan feels I think it is warming my oil too through conduction. Thanks for the advice on the timer. That is a great idea.
Sounds more reasonable. I've always preferred the tank type circulating block heaters but the plug replacement type work well and mine have always been rated either 750 or 1000 watts. Any type helps in really cold weather. Over the years I've used them all depending on availability. Even the heated dipsticks for old VW's. For old flatheads the elect headbolt heaters work well. I would stay away from the lower rad hose insert type though. They seriously cook and degrade the hose.
In anycase what it costs on your electric bill is going to be a lot cheaper than missing a day of work cause your car won't start.
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Old 01-02-2013, 03:47 PM
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You are much better off with the block heater than the magnetic oil burner job.
The oil "heaters" don't work nearly as well in getting the heat into the engine, so your "goodness"/watt is better with the block heater.




Quote:
Originally Posted by cjarcher
Upon testing with a multimeter the doc slipped a decimal so it draws 780 watts, which I am pretty disappointed in. Now that I know that I almost wish I stuck with the magnetic heater. I'm happy I have something permanently mounted though and as warm as the oil pan feels I think it is warming my oil too through conduction. Thanks for the advice on the timer. That is a great idea.
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-----------------------------------------
Home of ADHD project list

1977 J-10 Honcho 360-T15-D20
1977 Cherokee WT 360-Th400-NP241 true-trac(s)
1979 Cherokee 4 Door 258-T-18-D20
1981 Cherokee Chief WT 360-727-NP208
1972 K20 Suburban 350 SM465 205
And the other stuff that gets driven
----------------------------------------
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  #11  
Old 01-04-2013, 08:31 AM
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I prefer the inline one for the heater hose that heats and moves the fluid around.
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  #12  
Old 01-04-2013, 09:57 AM
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This style moves water around as well. I don't know what the property of matter is called that makes it happen but as the fluid is heated it naturally circulates. I've had the radiator hose style heater on my trailblazer with the 4200 atlas motor and it didn't get nearly this warm. I can feel the heat on the valve cover even.
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'85 Grand Wagoneer
'16 JK 2 Door, 6 speed (sold)
'82 J10, 258, tf904, np208, 2.73 (sold)
'96 ZJ 5.2 (sold)
'98 ZJ 4.0 (sold)
'76 CJ5 232 (sold)
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