Glow plugs
- Thread starter roy1
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GRUNT
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Dunno I've never bothered checking resistance, just connect em across the battery an if you burn your fingers their OK.
The resistance should be VERY little, but rises smartly as the plug gets red bloody hot.
At half an ohm three of them might be OK, but at 7.5 ohms the other one is shagged.
The plugs will draw about 20 amps each from cold, so by Ohm's Law
V = I x R (volts = amps times resistance)
so R = V / I
so R = 12 / 20 or so
which is close enough to the half ohm you measured.
CharlesY
At half an ohm three of them might be OK, but at 7.5 ohms the other one is shagged.
The plugs will draw about 20 amps each from cold, so by Ohm's Law
V = I x R (volts = amps times resistance)
so R = V / I
so R = 12 / 20 or so
which is close enough to the half ohm you measured.
CharlesY
discomania
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1986 - it will be a 2.5 TD, the TDI's did not come out until 1990.
chris_mack
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you can buy indivudal plugs u know.
Sure, but there's a certain good feeling as you climb into the car in mid-January with snow all around and it's minus ten outside, and you just think about those four lovely glowplugs that are just about to go red bloody hot exactly where it matters ....
or of course you could flatten your battery while wishing you hadn't been such a cheapskate.
Remember, "NO GLOW, NO GO" applies to lots of diesels on cold starts.
CharlesY
Way to glow!
Cheaper plugs are not as good as the best quality ones, but they are surely a lot better than plugs that don't work.
Copper grease the threads before fitting and DO NOT OVERTIGHTEN them.
Nipped up snug and not a lot more is plenty.
CharlesY
Cheaper plugs are not as good as the best quality ones, but they are surely a lot better than plugs that don't work.
Copper grease the threads before fitting and DO NOT OVERTIGHTEN them.
Nipped up snug and not a lot more is plenty.
CharlesY
chris_mack
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charles when i recently fitted 4 new plugs i didnt copper grease the thread is this a problem? do u think i should take them off and put them on agen with copper grease?
If I bought the car from you today and knew that, I would have the glow plugs out tomorrow, and coppergrease them and put them back carefully.
In answer to your question:
YES.
And if you get a little brush, keep it in your coppergrease can (I use a washed out beans can) and apply to every nut and bolt you put near your Landy.
One day someone will bless you for it.
CharlesY
chris_mack
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ok will do so what does the copper grease actually do?
bustersbus
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chris_mack
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ermmmmm... grease things
yeh well done
but why grease something that isnt a moving part?
bustersbus
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Maybe it's because it wont seize and be easier tae take oot in the future. That's just my guessyeh well done
GRUNT
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Think of it as an assembly paste for hot bits, it'll stop em siezing together an make it easier to get apart in fook knows how many years time. Copper Slip gets used for all manner of jobs it wasn't designed for but for glow plug threads it's ideal.
G-man
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always copper slip your wheel studs, and when fitting disks(brake) use it on the mating serface(not the friction serface dummy) and when you take the disks off next time you won't have to smash them off with a lump hammer
G-man
BBQ king
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don't try to use it as a sexual lube its not good for that it will leave a mark
