Quote:
Originally Posted by nhdoc
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I'd be very reluctant to turn those injectors another 1/4 turn after 40 NM since they really seemed to snug up fast and you are tightening against the pre-chambers set into aluminum.
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I agree; once the injector is seated, there isn't much wiggle room at all. The tightening torque rises very quickly from that point.
This is an old thread, but in searching for the torque spec for the injectors on my car, I haven't found anything definitive. I'm reluctant to disagree with Roy, but the 45 degrees additional tightening thing could not be right. I should qualify that by saying that I'm assuming for now that the torque spec would be the same for both the turbo and non-turbo engines, since I don't have any other information.
I just tried this on my car (OM606.910). I had first tightened all six injectors to 40 nm. Then I dialed the setting on my wrench way up, without even looking at where I had stopped, since the second stage tightening wasn't specified as a torque value.
I proceeded to tighten the first injector about another 20 degrees, at which point the wrench clicked and I stopped. I checked the wrench setting - it was 83 ft-lbs (113 nm)! I can't imagine what it would take to get to a full 45 degrees, but I'm sure not going to try it. I just hope I haven't done any damage already. I'm going to retighten the injector to 40 nm, though I admit that doesn't seem very tight.