3.0d e53 glow plug change
Afternoon all. In the new week or two I’ll be doing the vacuum hoses on the 3.0d e53. While the inlet manifold is off do you think I should replace the glow plugs and relay as there not working. If so what’s best way of getting them out with them breaking.
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Pre treat with release agent like kroll or liquid wrench and use impact tool vs breaker bar.
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The main thing is that you warm up engine properly before removing the glow plugs.
By the way are you talking about M57 or M57N engine (pre-facelift vs. facelift)? |
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Seriously - these things are fragile. Install torque is like 18Nm, release is like 25Nm max - since they shear off at about 26Nm!! :yikes: They DO get jammed due to carbon build up and I guess sometimes force is required to get them out if that is the case. But you would want to hope it's not! :thumbup: |
I'll take the advice of somebody that runs an oil burner. I'm using general advice that impact is much less likely to break things or strip threads. Doesn't have to be 1100 ft·lb monster can be the little Milwaukee M12 screw impact.
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My personal approach is to tackle these slowly, on a warm engine (to soften any carbon deposits), with lots of penetrating oil and a 1/2"-drive torque wrench set to (in the case of the M57) around 25Nm. If they don't start moving before I hit 25Nm, I would stop. Fortunately, they have always moved before then (for me). Phew!!! :thumbup: |
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Their recommended tightening torque is 15 Nm, BMW recommends 18 Nm. https://www.beruparts.eu/content/dam...glow-plugs.pdf |
Thanks for the extra info. Clavurion. :thumbup:
Interesting to note that Beru suggest applying power to the glow plug to heat it up, as an alternative to warming the engine. Which raises another note (for the sake of the thread...) - the M57 uses 12v glow plugs but the LCI cars with the M57TU uses 5v glow plugs. Beru note only applying power to the older 12v plugs. They may state this simply because a high current 5v power source is not a common option for most mechanics but it generally means that those of us with the M57TU will be warming the engine before disassembly. |
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