Anyone know where this may have come from? - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 07-21-2019, 07:55 AM Thread Starter
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Anyone know where this may have come from?

MY2000 SL600 Sport

I recently replaced my coolant pump. This involved removing the fan shroud, radiator, fan clutch, thermostat, thermostat housing, and coolant pump, and replacing.

In the end I found one allen bolt left in my tray. Looking high and low and borrowing an inspection camera I cannot find where it may have come from I have driven larger and larger trips culminating in a 188 mile trek yesterday with no problems or rattles.

Upon taking pictures for your perusal, I went to the garage and measured what size allen key it uses. Much to my surprise a 6mm was loose and it turns out it is a 1/4 SAE!

Could it be that it did not come from my baby at all but is a leftover from some other project? It is not magnetic if that helps.

Thank you for any input.
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post #2 of 5 (permalink) Old 07-21-2019, 06:29 PM
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That's not an OEM MB Allen head bolt (notice the serrations on the side of the head).
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post #3 of 5 (permalink) Old 07-22-2019, 03:03 AM
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When my bottom cushions were removed..bolt similar to yours was removed...previous poster says... MB bolts don't have the lines on the bolt head though....
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What the others are here for, I have no idea.
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post #4 of 5 (permalink) Old 07-22-2019, 07:08 AM
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Another test would be to see if an SAE or Metric nut threads onto the bolt.

If it's SAE case closed.
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post #5 of 5 (permalink) Old 07-25-2019, 04:06 PM Thread Starter
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Thank you mahunt I appreciate your steering me in the right direction. It turns out it is an SAE thread as well as hex size head. 1/4 inch fine.

No more worries, no more straining to hear any rattles from where it might have come from. Yahooo!

And thank you too Benica for replying.

Take care and enjoy
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