300d broken head bolt - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 11-26-2012, 07:18 PM Thread Starter
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300d broken head bolt

My timing chain broke in my 1977 300d. The cam shaft also sheared. One of the head bolts sheared while removing the head. I tried to drill the bolt and remove with an easy-out, and the the easy-out sheared inside the bolt.

Any ideas?? Can I bolt the new head on with one bolt missing? It it is an inner bolt inbetween #1 and #2 cylinders.
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post #2 of 3 (permalink) Old 11-27-2012, 11:18 AM
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It will be extremely difficult if not impossible to remove the bolt with the sheared-off extractor still in it. These extractors are made with a very hard material that's difficult to drill through. Most drilling bits won't do it and keeping the drill centered using manual methods results in damage to the surrounding threads.

I suggest that you remove the head completely and hopefully the bolt shaft will be sticking up above the block surface. At this point a pair of vise-grips should easily remove it. If not sticking above the block you will have to weld another bolt to it and then remove it.

Shop Reminder: Chase your bolt hole threads first to clean them then install the bolt using a proper lubricant.
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post #3 of 3 (permalink) Old 11-28-2012, 08:18 AM
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Some workshops have a spark machine that can remove a bolt.
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