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  #1  
Old 10-18-2020, 07:51 AM
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3.0d e53 glow plug change

Afternoon all. In the new week or two Ill 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 whats best way of getting them out with them breaking.
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Old 10-18-2020, 11:47 AM
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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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Old 10-18-2020, 12:05 PM
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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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Old 10-18-2020, 01:32 PM
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Quote:
Originally Posted by Clavurion View Post
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)?
M57 engine pre facelift
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Old 10-18-2020, 03:32 PM
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Originally Posted by roryb View Post
M57 engine pre facelift
Then it's unlikely the glow relay would need changing. The relay on these older systems fail very rarely. This DDE 4 has only one available fault code for entire glow system. That's why the code is for glow relay or glow plugs even if only one glow plug has failed.
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Old 10-18-2020, 08:13 PM
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Originally Posted by andrewwynn View Post
Pre treat with release agent like kroll or liquid wrench and use impact tool vs breaker bar.
With a warm engine and some release agent, they shouldn't be so tight that you need either an impact tool or a breaker bar!

Seriously - these things are fragile. Install torque is like 18Nm, release is like 25Nm max - since they shear off at about 26Nm!!

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!
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Old 10-18-2020, 10:29 PM
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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 ftlb monster can be the little Milwaukee M12 screw impact.
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Old 10-18-2020, 10:40 PM
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Originally Posted by andrewwynn View Post
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 ftlb monster can be the little Milwaukee M12 screw impact.
You are correct Andrew - the impact is much less likely to break things - and it's my usual tool of choice with threaded fittings that can be tough to break free too. It's just that in the case of these glow plugs, the outer hex is on a thin wall and the head (inc. the hex) can easily twist/shear clean off the body of the plug. These things aren't like spark plugs.

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!!!
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Last edited by wpoll; 10-19-2020 at 03:35 PM.
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Old 10-19-2020, 07:09 PM
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Originally Posted by wpoll View Post
Seriously - these things are fragile. Install torque is like 18Nm, release is like 25Nm max - since they shear off at about 26Nm!!
Actually according to manufacturer (Beru) the shear torque on these (M10 thread) is 35 Nm.

Their recommended tightening torque is 15 Nm, BMW recommends 18 Nm.

https://www.beruparts.eu/content/dam...glow-plugs.pdf
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Old 10-19-2020, 07:26 PM
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Thanks for the extra info. Clavurion.

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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