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#1
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What is the resistance limit for good glow plugs?
For an om617- what would the upper limit be? I have a few plugs that are testing at 4.5 to 6 ohms (engine warm, if that matters) and want to know if I should replace them.
Thanks.
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I could not own any MB without the help from you...fellow forum members. 83 300td 207,XXX |
#2
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1.5--2 ohms is what I've seen stated before. Yours seem high to me. Best way to check is to pull them out and put 12 volts to them.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#3
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JUST BE CAREFUL
Do NOT touch the glow plugs!!!!
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daw_two Germantown, TN Links: Sold last car --- 05/2012 1984 300D Light Ivory, Red interior Cluster Needles Paint New Old Stock (NOS) parts Past: 3/2008 1986 300SDL "Coda" 04/2010 1965 190D(c) "Ben" & many more |
#4
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As the get hotter the element reistance of the glow plug increases. If you are getting say 1 ohm readings on some plugs and at the same time basically 4.5 ohms or so on others.
It is a pretty sure thing you have to examine things more carefully. Since there may be variables present. Pulling them and doing a direct voltage test application for observation may be best. If a plug and its feed wire from the timer box is showing 4.5 ohms something is not normal. |
#5
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you have to be precise first do you meter correction readings (probe wires head to head) I practice to change any above 1 ohm - measured cold GP only. from your post I would say that you have those 6 ohm to change .
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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded next wish/project: w114 coupe OM603 powered |
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