Bullman Posted March 9, 2002 Share Posted March 9, 2002 Can anyone tell me after how many running in miles should you re-torque the cylinder head.What is the procedure for retorqueing the head bolts.What order of bolts should this be done by?Any advice,help, would be greatly received.Thanks Bullman. Bullman Link to comment Share on other sites More sharing options...
oilyhands Posted March 10, 2002 Share Posted March 10, 2002 Always used to do mine after about 150 miles but opinions vary, as a general rule the order of bolt tightening for any series of head bolts can be determined by imagining a spiral starting at the centre of the head, trace the spiral outwards in your mind and each time it reaches a bolt, tighten it, this gives pretty much the right sequence in 99% of cases. Oily Link to comment Share on other sites More sharing options...
Coose Posted March 10, 2002 Share Posted March 10, 2002 Start in the middle and go cross-corners, working outwards. i.e. (not sure how many headbolts to a x-flow, even though I have one in the garage! Imagine there are 10....) see the diagram below... 7 4 2 6 9 10 5 1 3 8 Does this make sense? Link to comment Share on other sites More sharing options...
Coose Posted March 10, 2002 Share Posted March 10, 2002 Start in the middle and go cross-corners, working outwards. i.e. (not sure how many headbolts to a x-flow, even though I have one in the garage! Imagine there are 10....) see the diagram below... 7 4 2 6 9 10 5 1 3 8 Does this make sense? Link to comment Share on other sites More sharing options...
Coose Posted March 10, 2002 Share Posted March 10, 2002 Start in the middle and go cross-corners, working outwards. i.e. (not sure how many headbolts to a x-flow, even though I have one in the garage! Imagine there are 10....) see the diagram below... 7 4 2 6 9 10 5 1 3 8 Does this make sense? Link to comment Share on other sites More sharing options...
Old Septimus Posted March 11, 2002 Share Posted March 11, 2002 Mclaren did some research on torqeuing and discovered that there was a huge difference in the compressive load produced by the bolt depending on whether the threads were lubricated and if so with what. An absolute torque figure is thus fairly irrelevant unless it specifies whether it is dry or not. Link to comment Share on other sites More sharing options...
oilyhands Posted March 11, 2002 Share Posted March 11, 2002 Standard rules Always oil the threads Always oil under the bolt heads Oily Link to comment Share on other sites More sharing options...
GaryDrew Posted March 11, 2002 Share Posted March 11, 2002 ......except wheel threads (there's always one out there!) Link to comment Share on other sites More sharing options...
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