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Old 12-18-2013, 02:29 PM
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Replacing glow plugs

It's really cold and the truck won't start without the heater. Did a little research and am ready to give it shot. I tested the GPR and it seems fine. So I pull the 4 plugs from the covers none of the wiring was melted (2 plugs had been replaced before). There was also oil on 3 of plugs. I heard that can cause problems.So next test the ohm's. 3 read very low, 3 don't read at all and 2 are off the meter. I'm not very adept at reading the meter, but that can't be good. I'm off to the parts store.


Should I also get gaskets?
Any tricks to getting them back on without leaking?
What parts store carries a good glow plug?
Thanks
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Old 12-18-2013, 05:58 PM
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oem is the best way to go. i have had good luck with alliant power. if your connections are good you dont need new valve cover gasket. only trick that helps putting them in is i take a 6in section of vacuum hose and slip over the tip of the glow plug. makes it easier to put in and faster to thread in. then torque i believe is 14ft/lbs
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Old 12-18-2013, 08:15 PM
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Yeah ended up going with Bosch from Napa.Got the new VC gaskets, but not sure if I need them? Don't know where the oil in the connecter would come from? Put the first side of plugs in and checked ohms through gasket. All are now reading the same.Really don't want to change the gasket, but I don't want to do this again anytime soon. Thanks
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Old 12-19-2013, 09:07 AM
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Motorcraft ZD-11 glow plugs ONLY. Any others could swell and become impossible to remove later.

OEM gaskets should be fine, and will probably work better than the ones you bought.

Oil could be from the outside, just spilled on them some time when you added oil to the engine.
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Old 12-19-2013, 11:31 AM
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Thanks for the info. I'd heard no autolite gp's, thought the bosch might be ok? Sounds like I may be changing them again.
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Old 12-19-2013, 11:43 AM
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I've heard good things from Bosch. Alliiant is also just as good as motorcraf
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Old 12-21-2013, 03:53 PM
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Quote:
Originally Posted by madpogue View Post
Oil could be from the outside, just spilled on them some time when you added oil to the engine.
Was fresh oil, right? The glow plugs go down into a hole before the threads start. When you loosen the glow plugs and pull them out, then oil that was above will drain down the plug.

Now if it where burned oil residue, then it would be the problems you had heard about... But that burned residue also make the glow plugs hard to pull out because of that burned on residue.
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Old 12-23-2013, 08:54 PM
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Yeah, the oil was actually in the VC gasket connector.
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