Torque specs
- Thread starter kite63
- Start date
Online manual
Hi Kelvin,
I no nothing of torque specs, but this online manual that Rudy is hosting may help. I believe it covers years past 80. At least the pic of the vehicle tag says the car was manufactured in "02-81"
http://socalx.com/xhelp/shopmanual.htm
In the engine section, there is a brief mention of torquing the head on page 10-51. It gives specs, but I didn't see a discussion of bolt type.
http://www.socalx.com/xhelp/X1-9_101-01_10-43.pdf
There is a general torque spec page at 10-9
http://www.socalx.com/xhelp/X1-9_10_10_10-1.pdf
Hi Kelvin,
I no nothing of torque specs, but this online manual that Rudy is hosting may help. I believe it covers years past 80. At least the pic of the vehicle tag says the car was manufactured in "02-81"
http://socalx.com/xhelp/shopmanual.htm
In the engine section, there is a brief mention of torquing the head on page 10-51. It gives specs, but I didn't see a discussion of bolt type.
http://www.socalx.com/xhelp/X1-9_101-01_10-43.pdf
There is a general torque spec page at 10-9
http://www.socalx.com/xhelp/X1-9_10_10_10-1.pdf
Pete Whitstone
True Classic
Well that depends...
Are they truly "Torque to Yield" fasteners? If so the answer is "they can't be re-used".
The "yield" in "torque to yield" means that they are torqued past their yield point. In other words, when you take them off, they will be longer than when you put them on, because they permanently stretched.
I think true torque-to-yield fasteners require a special wrench to install. IIRC, it measures torque like a normal torque wrench, but once that spec has been reached, there is an addition spec that is expressed in angle, as in, 30 more degrees. The wrench has some kind of angle meter built into it, I think... unclear on this.
Pete
Are they truly "Torque to Yield" fasteners? If so the answer is "they can't be re-used".
The "yield" in "torque to yield" means that they are torqued past their yield point. In other words, when you take them off, they will be longer than when you put them on, because they permanently stretched.
I think true torque-to-yield fasteners require a special wrench to install. IIRC, it measures torque like a normal torque wrench, but once that spec has been reached, there is an addition spec that is expressed in angle, as in, 30 more degrees. The wrench has some kind of angle meter built into it, I think... unclear on this.
Pete
Steve Hoelscher
True Classic
Opinions are like....
... everybody has one.
On that note, it is my opinion that these are not Torque to Yeild bolts.
I have measured lots of these, before and after use and have noted only a very few that are out of spec. I have mic'ed and reused dozens of them with no problems. And that includes on my race motors.
I have used torque to yield fasteners on a number of other engines and have noticed that you can typically see visual evidence of the stretch in threads. And they always mic longer after use.
When re-installing an FI head the most important thing to do is be sure the threads in the cylinder block are clean. Be sure to chase these with a tap, flush with brake clean and blow the holes out with compressed air.
... everybody has one.
On that note, it is my opinion that these are not Torque to Yeild bolts.
I have measured lots of these, before and after use and have noted only a very few that are out of spec. I have mic'ed and reused dozens of them with no problems. And that includes on my race motors.
I have used torque to yield fasteners on a number of other engines and have noticed that you can typically see visual evidence of the stretch in threads. And they always mic longer after use.
When re-installing an FI head the most important thing to do is be sure the threads in the cylinder block are clean. Be sure to chase these with a tap, flush with brake clean and blow the holes out with compressed air.