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  #1  
Old 01-22-2019, 09:38 PM
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How would I test my block heater? 1984 OM617

I have a feeling it isn't working. How would I test it? Are there replacements available for it?
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  #2  
Old 01-22-2019, 09:58 PM
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Plug in and listen, you should hear it after a few minutes. You can also test resistance across the power cord with a normal volt/ohm tester. Or use a device like a kill-a-watt to measure power usage.
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  #3  
Old 01-22-2019, 10:11 PM
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When I plug it in, I don't hear anything. Mulitmeters are easy when testing voltage. Testing ohms is a grand mystery. What should the correct ohms be for the block heater? Any advice on testing it with a cheap Cen-tech that I picked up at Harbor Freight?
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  #4  
Old 01-23-2019, 07:16 AM
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perhaps this is terrible advice but.. touch it? When i bought my 72 I was curious if the block heater worked. So I plugged it in and briefly touched it and noticed it was hot! maybe wear a glove, or touch the hose / area near it but not he heater itself?
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  #5  
Old 01-23-2019, 08:37 AM
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For resistance just (unplugged) put the probes across each terminal. I dont know the desired resistance, but any meter should work.

Easier yet, plug it in and put your hand on top of the motor after a few hours. Should be pretty obvious if the valve cover is warm. No hand burning here. Just did this a couple weeks ago after new cord install. Surprised how the whole motor was warm to the touch.
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  #6  
Old 01-23-2019, 09:10 AM
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Buy an infrared thermometer and check when it is plugged in. Hey, any reason to buy a new tool, right?
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Old 01-23-2019, 12:01 PM
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Check the current draw.........
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Old 01-23-2019, 01:11 PM
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Well, for some reason, I have 175 watts stuck in my head. Resistance (ohms) = Volts squared divided by watts. So we know the volts, 115, and the watts, 175. Equals 75ish ohms. Any meter will do, we're not talking micro circuitry here.
Also try checking resistance at the element in case its your cord that's bad. Obviously, check the outlet, too.
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Old 01-23-2019, 01:30 PM
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Plug it in for an hour and feel it. Not complicated and no meter required.
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  #10  
Old 01-23-2019, 02:06 PM
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If you have a multimeter, put it on ohms. I'm thinking anything less than a hundred. If its hundreds, clean the contacts and try again, if the contacts are clean and it's an open circuit (thousands of ohms/end of the scale) then it's bad.
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Old 01-23-2019, 02:13 PM
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Thumbs up

FYI, the wall plug end of the cord on my SDL was bad...that is why it was 'broken'. Fresh cord fixed my issues.

I suppose it could burn out, but suspect the cord before heating element.

Or like last poster said, plug in for a while.

Hell, I can hear mine when first plugged in. Put ear down there and listen close
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  #12  
Old 01-24-2019, 01:18 PM
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Make sure you touch the leads of the meter together first, they should go to zero or nearly zero resistance. Test the test tool first.

I never did get a cord that worked for my block heater. I have a magnet mount heater but have never used it. 5w-40 oil and good glow plugs and battery and I've never had any trouble starting, even with temps in the teens and with a glow plug out.

Where are you located, OP? You may not need a block heater.
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Old 01-24-2019, 05:10 PM
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If the cord turns up bad someone here gave me the P/N for the new cord @ NAPA, they'll prolly re post it now .
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  #14  
Old 01-24-2019, 05:21 PM
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Quote:
Originally Posted by vwnate1 View Post
If the cord turns up bad someone here gave me the P/N for the new cord @ NAPA, they'll prolly re post it now .

NAPA part # KAT 28216

https://www.napaonline.com/en/p/KAT28216
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  #15  
Old 01-24-2019, 10:42 PM
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Quote:
Originally Posted by resto108 View Post
Well, for some reason, I have 175 watts stuck in my head. Resistance (ohms) = Volts squared divided by watts. So we know the volts, 115, and the watts, 175. Equals 75ish ohms. Any meter will do, we're not talking micro circuitry here.
Also try checking resistance at the element in case its your cord that's bad. Obviously, check the outlet, too.
Its closer to 290 watts or so. The heater on my OM601 averaged 293 watts or so when operating.
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'15 GLK250 Bluetec 75k - mine - (OC-80,500)
'17 Metris(VITO!) - 6k - wifes (OC-10k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'89 420SEL 166k - mine (OC-167,000)
'01 E320 - 168k - dad's (OC-171,500)
'07 E350 Wagon - 131k - dad's (OC-132,500)
'01 SL500 - 48k - dad's (OC-52,000)
'09 E350 4matic Sedan - 128k - Brothers (OC-128,000)
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