Changing glow plugs on a 2.5na

Northwind

Northwind

Well-known member
Believe i have the original plugs in my 1990 ex mod, so i picked up some plugs from Rovers North the other day for a little preventive maintenance. Based on what i can see it really looks straight forward, remove the wires, pull the plug and put in the new one? but then again its a Defender and nothing seems as it should. figure id check in with the group before attempting. Thanks in advance for any insight.
 
javelinadave

javelinadave

Administrator
Staff member
I would flood the thread area with penetration oil for a day or two before trying to twist them out. The last thing you want to do is to have the glow plug snap in half. Also if it doesn't let go with minimal pressure move on to the next one.
 
RDavisinVA

RDavisinVA

Technical Excellence Contributor
There is a glow plug reamer special tool used to clear away all the muck that builds up around the plugs.
You would test each plug and if it draws current leave it alone.
If it doesn't draw current, then it needs to be replaced.
 
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Northwind

Northwind

Well-known member
Of course i should have known it would be complicated. So now i am thinking that maybe i will just have the shop test next time i bring it in. BTW first year in 4 yrs of ownership I haven’t had it in the shop for extended periods. Road tripping this weekend for the MN duck opener. .....drove 175 miles last weekend to improve my deer stand and no issues. Cruised @ 60mph with ease. But then again something is bound to break again at some point
 
RDavisinVA

RDavisinVA

Technical Excellence Contributor
To test all you do is to remove the nuts and wire ring terminal.
Screw the nut on finger tight then touch each glow plug with a wire attached to the (+) battery terminal.
If it sparks, the glow plug is working at some capacity.
If there is no spark, the plug needs to be replaced.
I think you'll be able to accomplish this on your own without going to a repair shop.
 
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