R

roy1

Member
Hi Anyone know the resistance of a glowplug land rover 90 2.5 TDI (year 86)
I have 3 at .5 ohm and one at 7.5 ohm
Bryan
 
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
 
When checking a glow plug take care not to be holding the tip when you connect it to a battery - it will get so hot so quickly you may be burned before you can drop it.

They get impressively hot - warm not. Orange hot is common.

CharlesY
 
chris_mack said:
you can buy indivudal plugs u know.
Click to expand...

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
 
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?
 
chris_mack said:
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?
Click to expand...

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
 
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.
 
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
 
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