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Old 31-12-2010, 13:25   #1
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Volvo MD2030 Glow Plugs

OK so I have a hard to start issue in the cold. I have 12.75 volts to the glow plug bar. How do I check the operation of each glow plug? I have pulled the bar off and tried to check the resistance across each plug. I placed the multi meter on the center conection (threaded for the power bar) and then grounded out to the block and got nothing. I then tried grounding out to the outer ring of the glow plug. This time I got nothing on either of the outer 2 plugs and a varying number on the centre one.

Am I doing this correctly?[
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Old 01-01-2011, 00:47   #2
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an amp gauge is the best bet. Figure 10A per glow plug.
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Old 01-01-2011, 08:00   #3
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Quote:
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I have 12.75 volts to the glow plug bar.
[
I would have expected a bigger voltage drop.
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Originally Posted by never monday View Post
an amp gauge is the best bet. Figure 10A per glow plug.
So 10A at 12.75V = 1.275Ohms, a small reading for most meter.
Perkins M30 glow plug are rated at 10.5V, 6.9A, 1.6 +- 0.16 Ohms. A 12V test lamp can also be used.
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Old 02-01-2011, 11:07   #4
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Thanks guys. I'm still looking for clarification on how to test the plugs to make sure they need to be repalced.
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Old 02-01-2011, 11:14   #5
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Thanks guys. I'm still looking for clarification on how to test the plugs to make sure they need to be repalced.
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Old 06-01-2011, 19:34   #6
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Thanks Gord. I was able to make some calls and got the page from the VP service manual sent to me. I have attached for anyone else that wishes.
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