bionicxr6t05 Bronze Donating Members 2,216 Member For: 13y 4m 26d Gender: Male Posted 28/04/12 09:56 AM Share Posted 28/04/12 09:56 AM Whilst I am going to contradict myself, yes I know what torque to yield bolts are and yes theoretically you should replace them.... however I have reused them many times without failWhat boost/power u running? Why you would reuse them is beyond me... Shell out once for a good set of studs that you know will hold the head down at most power levels... Reusing factory bolts is a guessing game, im suprised they didnt snap when you "re torqued" them.... Tensile strength is completely lost after they are torqued up initially then undone Link to comment Share on other sites More sharing options...
riptide Member 733 Member For: 13y 11m 5d Gender: Male Location: Auckland, New Zealand Posted 28/04/12 10:21 AM Share Posted 28/04/12 10:21 AM that's awesome as the std pistons are stout as anyway. I hate forged piston slap. this is what I will do, do u have to press fit the gudgeon pins or are they circlips ?The small ends are silicone bronze bushed so I opened them up to a nice, snug slide fit and yes, they are circlipped Link to comment Share on other sites More sharing options...
turbotrana Member 2,586 Member For: 21y 8m 23d Gender: Male Posted 28/04/12 11:09 AM Share Posted 28/04/12 11:09 AM The head bolts are 12.9 grade from memory so unless the head of the bolt has come off then I reckon they are fine to use. Might even work better using a used bolt. Just use the stock ford gasket. Link to comment Share on other sites More sharing options...
possum Donating Members 553 Member For: 15y 7m Gender: Male Posted 28/04/12 01:45 PM Share Posted 28/04/12 01:45 PM What boost/power u running? Why you would reuse them is beyond me... Shell out once for a good set of studs that you know will hold the head down at most power levels... Reusing factory bolts is a guessing game, im suprised they didnt snap when you "re torqued" them.... Tensile strength is completely lost after they are torqued up initially then undoneI don't actually own a xr6t anymore.....but I've assembled a few engines recently Link to comment Share on other sites More sharing options...
ebxmple Member 1,322 Member For: 16y 10m 23d Posted 28/04/12 11:24 PM Share Posted 28/04/12 11:24 PM If you have an FG and it comes in for warranty repair of a leaking headgasket,we reuse your bolts. If it was my car I would replace them,but Ford dont allow cost for new headbolts.. This suprises me everytime,as they have to warrant the head job that's being done,but yeah,none have ever come back. Link to comment Share on other sites More sharing options...
bionicxr6t05 Bronze Donating Members 2,216 Member For: 13y 4m 26d Gender: Male Posted 29/04/12 12:01 AM Share Posted 29/04/12 12:01 AM Every time iv done a head under warranty I used new bolts no problems? Link to comment Share on other sites More sharing options...
kartman Member 88 Member For: 15y 3m 12d Posted 29/04/12 07:40 AM Share Posted 29/04/12 07:40 AM I replace head bolts on every head I do, if you have a stretch gauge and can compare your used bolt to a new one and know the limitations ten it's not worth the risk. The stock head gaskets are very good, the multilayer steel shim is the most common form of headgasket these days due to the reliability of them. Cometic have a good rap but I have two customers who have gone back to stock gaskets from Cometic allthough not in Fords, LS1 twin turbo'sCheersJoel Link to comment Share on other sites More sharing options...
possum Donating Members 553 Member For: 15y 7m Gender: Male Posted 29/04/12 08:53 AM Share Posted 29/04/12 08:53 AM Every time iv done a head under warranty I used new bolts no problems?When you use new head bolts does ford specify a procedure to "stretch" them then back them off and then actually torque them down? Link to comment Share on other sites More sharing options...
bionicxr6t05 Bronze Donating Members 2,216 Member For: 13y 4m 26d Gender: Male Posted 29/04/12 09:03 AM Share Posted 29/04/12 09:03 AM Yep run down all bolts to 30nm first then tighten 90 degrees then undo them then retorque to 40nm then a further 2 90 degree turns.... Il recheck it tomoro as iv printed that page and stuck it on the wall next to my toolbox, Link to comment Share on other sites More sharing options...
riptide Member 733 Member For: 13y 11m 5d Gender: Male Location: Auckland, New Zealand Posted 29/04/12 09:12 AM Share Posted 29/04/12 09:12 AM (edited) I will probably re-use the head bolts, just because I can't afford to pay the ridiculous prices Ford ask for them here.I am still unsure whether I should return the multi layer 1.3m/m head gasket I have here and get the cheap one or not??One thing that concerns me with the thicker one is that you get a spacer with the kit so does that mean the timing chain cover bolts won't line up where it bolts to the head??Did I read that right. Two lots of 90 degrees after 40nm? My Max Ellery book says 40nm then 90 degrees. Edited 29/04/12 09:15 AM by riptide Link to comment Share on other sites More sharing options...
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