mawscode2 Posted June 30, 2015 Share Posted June 30, 2015 Hi Guys,Have two damaged head bolt threads in an E9 block. Just wondering if anyone has ever had to carry out a repair like this. Had our local engineer over yester day and tossing up wether to tap out threads to 11/16'' with the same pitch as the standard 5/8'' threads, or, is it possible to drill deeper into the block and extend the original size threads.ThanksJeffMawscode Truck RepairsCaboolture, QueenslandAustralia Quote Link to comment Share on other sites More sharing options...
chief doug Posted June 30, 2015 Share Posted June 30, 2015 heli-coil to the same size so all are torqued to the same value Quote Link to comment Share on other sites More sharing options...
mawscode2 Posted July 1, 2015 Author Share Posted July 1, 2015 We had thought of that too Doug but was a bit concerned about the block thickness between the edge of the hole and the edge of the liner flange. But after talking to a few different engine guys we think we should be ok. Thanks for your input mate. Quote Link to comment Share on other sites More sharing options...
TRH Posted July 5, 2015 Share Posted July 5, 2015 I'd use a timesert over a helicoil. They're similar but a helluva lot stronger. Especially if you're close to a liner flange. 1 Quote Link to comment Share on other sites More sharing options...
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