Now that I have royally hosed myself - I think I see three options:

1) Use JBWeld to fix the bolt to the block - not a great fix but it MAY work temporarily

2) Remove the timing chain cover, drill and insert the 'Timesert' solution with proper thread into the damaged hole.

3) Buy and install a new timing chain cover... which reminds me - my buddy has a dead engine that he just removed from his 1991 2.5L 300D (602 engine). Will that timing chain cover fit my 603?!

Not a happy camper...

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K