Testing glow plugs
Submitted: Sunday, Jun 04, 2006 at 09:24
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Mudness
Hi, I suspect several of my glow plugs are faulty (1HZ). I have checked power to them (no problem there), anyone know the easiest way to
check the plugs individual operation? Cheers Mudness
Reply By: Barnray - Sunday, Jun 04, 2006 at 10:31
Sunday, Jun 04, 2006 at 10:31
Disconnect the busbar from the plugs and use a
test light from the Positive on the battery to the terminal will
check for continuity. no light = no glow. Barnray
AnswerID:
176623
Reply By: bmwrider - Sunday, Jun 04, 2006 at 17:27
Sunday, Jun 04, 2006 at 17:27
If you have an Ohmmeter on your Multimeter, positive lead to the glow plug end and negative lead to earth (engine block) and
check the readings. The good plugs will read something like 5 k ohms (whatever the specs say). The crook ones will be open circuit (infinity ohms). Some may be below spec (very low ohms).
Garry
AnswerID:
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Follow Up By: V8 Troopie - Monday, Jun 05, 2006 at 00:30
Monday, Jun 05, 2006 at 00:30
5K ohms across 12V is not going to do much heating, is it? (0.03 Watt!) Maybe you meant 5 Ohms? Though I would suggest 1 Ohm is closer to the mark.
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Follow Up By: HJ60-2H - Monday, Jun 05, 2006 at 09:16
Monday, Jun 05, 2006 at 09:16
Yep, on my Cruiser the resistance across a good glow plug is 0.7 Ohm. Can make it hard to see if they are good or not when using a cheap Ohm meter.
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Follow Up By: bmwrider - Monday, Jun 05, 2006 at 11:31
Monday, Jun 05, 2006 at 11:31
I stand corrected (I knew someone would - lol) It's been a few years since I had to
check some on a Jeep Diesel and I couldn't remember the specifications. As HJ60-2H says it is hard to see the differences, but an open circuit glow plug is clear. Glow plugs can be sourced fairly cheaply (if you do some checking around). If they have been inservice for some time, it might pay to replace them all and keep the best ones for spares.
Garry
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Reply By: gqpat - Sunday, Jun 04, 2006 at 19:55
Sunday, Jun 04, 2006 at 19:55
Disconnect busbar and quickly flash 12v across each plug if it _Affordable_Storage_Drawers.aspx current their ok dont hold the power on as some glow plugs will burn out real quick
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