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Old 04-30-2013, 10:14 PM
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Join Date: Feb 2013
Location: Mid-Missouri
Posts: 70
Reverse Thread Chaser Advice Needed W126 560SEL

Hello all,

Doing a full-blown major tune-up plus new ignition coil on my 1986 560SEL this week and have run into a bit of a snag the spark-plug on no.8 cylinder fought me all the way out despite using generous amounts of penetrating oil.

Thank goodness no threads came out and a visual inspection of the bore with a dental mirror and flashlight reveals no visible thread damage. Spark-plug threads perfect.

The only indicator that something might be amiss is a slightly higher amount of gray aluminum powder + oil gunk on the threads near the crush washer.

To the point which is the14mm reverse thread chaser should I use to clean things up a bit before proceeding further bearing in mind that no.8 is a tight one in terms of accessibility?

Your opinions & experiences would be GREATLY appreciated!


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