Quote:
Originally Posted by pimpernell
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Yeah, old thread. Sorry if anyone is bothered but it's good to have all of the pertinent info in the same place.
pimpernell's quoted link is great! It also shows loosening torques (incorrectly labeled, for some reason). The idea is to prevent breaking the glow plug when removing. However uncommon this may be, it would be a big problem to fix I would imagine.
The doc says "ONLY remove and fit glow plugs using a torque wrench."
MAXIMUM removal torques are given as follows on page 15 (consider starting lower):
M8 - 20 Nm
M9 - 22 Nm
M10 - 35 Nm
M12 - 45 Nm
If they stick when removing, i.e., requiring that you exceed the removal torque values, apply synthetic oil (pb blaster like product?) and leave it to act, possibly overnight. Then warm up the engine. Then try again. Don't exceed the removal torques - repeat the above as required.
Tightening torques* for installation:
M8 - 10 Nm
M9 - 12 Nm
M10 - 15 Nm
M12 - 22 Nm
and for installing the electrical contact nut:
M4 2 Nm
M5 3 Nm
*But what about the money question? Should the threads be dry? Use AntiSeize? Grease? Not surprisingly, even this 16 page article is contradictory!
Statement against (install dry) page 13:
"Tighten plug with suitable torque socket wrench. Strictly comply with the specified torque (refer to specifications of the car manufacturers).
Do not oil or grease the thread"
Statement for (use grease) page 15:
Last quote from the article - After reaming, "Before installing the glow plugs,
grease the shaft and thread areas with GK grease (GFK01 – 0 890 300 034)"
So, it appears that you can just do whatever you think is going to work best.
One more point: From a cursory google search, the internet consensus seems to be that if you use anti-seize or grease on any threads that you should reduce the installation torque by 25-30% due to the addition of the lubricant (see one reference regarding this at the
FCP Euro Blog) [For some reason that is unknown to me, when I add the link it has *s instead of "*******". If you replace the *s with the text in the URL bar after clicking, the link will work. I will ask for help and edit as needed.]
Cheers!