Connecting Rod Pinch Bolts

[WM HYATT]

John - Heat treated Allen head type socket are tough to drill thru w/o using a jig & new split point 135 degree drill bit, or carbide drill bit. To make life easier grind a flat on round bolt head to centerpunch on. There are a # of sources for jigs to thru drill bolt heads for wire. Bill TC4296 Odessa, Florida

----- Original Message ----- From: JohnM To: mg-tabc@yahoogroups.com Sent: Friday, October 30, 2009 11:09 AM Subject: [mg-tabc] Re: Connecting Rod Pinch Bolts I have a set of 8mm x 1 socket head pinch bolts from Bob G. I was wondering how you are safeting yours? Bob? There are the original lockwashers. I suppose red high strength Loctite would work. I doubt the area would get hot enough to soften it. One could drill the top edge of the sockets and use Aviation safety wire. Thanks, John TC6338 --- In mg-tabc@yahoogroups.com, Peter Cole wrote: > > Roger, > > Try Non Standard Socket Screws Ltd at > http://www.nssocketscrews.com/index.php/html/ > > They make standard and non-standard cap head screws. > > Regards > Peter. > > > > 2009/10/28 Roger Furneaux > > > > > > > hi Tom - the thread is indeed 8x1mm, as are most other fixing on the engine > > which would have been 5/16" BSF on any other British car. > > > > The Allen head bolts need to be of 12.9 grade, the highest available. > > Originals are 32-33mm long with 20-21mm of thread, but a modern Allen head > > will be 30mm, and you will be very lucky to find any with some plain shank. > > The washers are standard square section spring washers. > > > > I normally stock both, but am currently looking for more bolts. > > > > ocTagonally > > > > TCRoger > > > > Tom Lange wrote: > > > > > Can anyone remind me of the necessary specs for replacing the pinch bolts > > with Allen screws? I vaguely seem to remember that they are 8x1mm, but > > don't remember the grade required. Also, does anyone have a source for the > > small washers? > > > > > > > > > [Non-text portions of this message have been removed] > [Non-text portions of this message have been removed]

[Bob Grunau]

Hi John, I use lock washers and Loctite. Never had a pinch bolt come loose but I do torque them to 33 ft-lbs. The bolt torque should keep it tight! I don't see the need for safety wire. I experimented with grade 12.9 - 8 x 1.0 mm bolts in a rod and there was no bolt stretch till about 44 ft-lbs and no failure of the bolt thread till about 48 ft-lbs. Interesting the thread in the XPAG rod was still perfect after several tests to failure of the pinch bolts. Bob Grunau -----Original Message----- From: mg-tabc@yahoogroups.com [mailto:mg-tabc@yahoogroups.com]On Behalf Of JohnM Sent: Friday, October 30, 2009 11:09 AM To: mg-tabc@yahoogroups.com Subject: [mg-tabc] Re: Connecting Rod Pinch Bolts I have a set of 8mm x 1 socket head pinch bolts from Bob G. I was wondering how you are safeting yours? Bob? There are the original lockwashers. I suppose red high strength Loctite would work. I doubt the area would get hot enough to soften it. One could drill the top edge of the sockets and use Aviation safety wire. Thanks, John TC6338

--- In mg-tabc@yahoogroups.com, Peter Cole wrote: > > Roger, > > Try Non Standard Socket Screws Ltd at > http://www.nssocketscrews.com/index.php/html/ > > They make standard and non-standard cap head screws. > > Regards > Peter. > > > > 2009/10/28 Roger Furneaux > > > > > > > hi Tom - the thread is indeed 8x1mm, as are most other fixing on the engine > > which would have been 5/16" BSF on any other British car. > > > > The Allen head bolts need to be of 12.9 grade, the highest available. > > Originals are 32-33mm long with 20-21mm of thread, but a modern Allen head > > will be 30mm, and you will be very lucky to find any with some plain shank. > > The washers are standard square section spring washers. > > > > I normally stock both, but am currently looking for more bolts. > > > > ocTagonally > > > > TCRoger > > > > Tom Lange wrote: > > > > > Can anyone remind me of the necessary specs for replacing the pinch bolts > > with Allen screws? I vaguely seem to remember that they are 8x1mm, but > > don't remember the grade required. Also, does anyone have a source for the > > small washers? > > > > > > > > > [Non-text portions of this message have been removed] > [Non-text portions of this message have been removed]