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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 08-25-2006, 01:13 PM   #1 (permalink)
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Block Heater not working?

My last post was about my glow plugs and new ones are on the way. In the meantime I've been relying on the block heater to get me started. Now it seems to have stopped working. I used to feel some warmth from the plug in wire when it was working and now it's cold. Also I can't get a resistance reading. It's only two years old and hasn't been used that much. What should the resistance reading be? (I'm not used to using the meter) [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 08-25-2006, 01:22 PM   #2 (permalink)
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Re: Block Heater not working?

First make sure the BH red power plug is in the BH, then do a continuity test with a meter on the main plug wires at the grill. If there is no continuity check the wires for breaks just behind the 120V plug. Pull on the wires and you can see the break as the shielding gets smaller, cut off the end. If the 2 power wires now have continuity through the BH just replace the 3 prong plug.


Are you aware of the block heater cracking the block on some 85 6.9 engines, what is the serial number of yours......

According to one update: I have the updated casting was implemented starting with block number 173828 (which translates to roughly halfway through the '85 model year).

The other is:
6.9 blocks up to serial #u2u17900 had a thinner casting around the block heater. It is very common for these blocks to crack.
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Old 08-25-2006, 03:18 PM   #3 (permalink)
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Re: Block Heater not working?

Thanks. A quick check of the continuity at the plug shows none. I will check the entire wire and heater later. This engine was replaced with a re-manufactured one just over two years ago. I'll have to pull the work order to get the serial number. Will get back to you on that.Thanks again. [img]/ubbthreads/images/graemlins/warmsmile.gif[/img]
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Old 08-27-2006, 11:14 PM   #4 (permalink)
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Re: Block Heater not working?

Visit my gallery and one of my pics will show where serial number is located.
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Old 08-29-2006, 12:40 AM   #5 (permalink)
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Re: Block Heater not working?

Not wishing to start a war here. When the engine is cold and you know the glow plugs are not working, you can squirt a small amount of starting fluid to start it. After you get it warmed up it will probably start just about all day without any more. It is much the best to fix your glow plugs and your block heater, but starting fluid might help you make it to work, ect.

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