I would suppose, being that it is a Mercedes engine, that it would be a metric allen wrench. Might be easier to find it if you know which engine model you have.
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Happy Camping! ///// Richard D.
2006 4x4 Ford 250 SD / 2007 Flagstaff 827 FLS
One very patient wife and one furry child who travels with us. Forty-two years of trailering and camping, and I still have a blast.
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