TTY learned the hard way
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Driver
Joined: Oct 2003
Posts: 245
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TTY learned the hard way
My rebuilt b16 is almost complete. I have taken the utmost care and time to carefully do everything but last night I had a major setback.
After recieving my oil dowel and o-ring I went to install it underneath the center camshaft retainer. All went well and after checking the torque specs in my haynes (and checking them twice) I commenced to tighten the bolts to 20ft/lbs.
Thats when the shit hit the fan. I should have stopped after the first bolt wouldn't tighten but my dumbass went on to the next bolt...which snapped.....$h!t.
....and while trying to remove the first bolt it snapped too.
Upon further inspection I realized they were (had to be) Torque-To-Yield....Months of work were on the line....At 1am this morning I had finally got them both out...I had to use a chisel to cut a line in the top of what was left of the bolts (which were recessed in the holes) while not scratching the surfaces or getting metal chips in the head.....
So let everyone else learn from my mistake ...DO NOT RE-USE TTY BOLTS..... (ie..head bolts and camshaft retainer bolts)
After recieving my oil dowel and o-ring I went to install it underneath the center camshaft retainer. All went well and after checking the torque specs in my haynes (and checking them twice) I commenced to tighten the bolts to 20ft/lbs.
Thats when the shit hit the fan. I should have stopped after the first bolt wouldn't tighten but my dumbass went on to the next bolt...which snapped.....$h!t.
....and while trying to remove the first bolt it snapped too. Upon further inspection I realized they were (had to be) Torque-To-Yield....Months of work were on the line....At 1am this morning I had finally got them both out...I had to use a chisel to cut a line in the top of what was left of the bolts (which were recessed in the holes) while not scratching the surfaces or getting metal chips in the head.....
So let everyone else learn from my mistake ...DO NOT RE-USE TTY BOLTS..... (ie..head bolts and camshaft retainer bolts)
Thread Starter
Driver
Joined: Oct 2003
Posts: 245
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Damn that I'm tired of learning...It ain't cheap..oooh well at least it happend now and not when the motors running ....Now that would be a learning experience....
Ohh and if all goes well I should be doing the swap before February......pics will come.
Ohh and if all goes well I should be doing the swap before February......pics will come.
I'm made of meat!
Joined: Mar 2003
Posts: 3,580
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From: Richmond, VA
He said it already. Torque To Yield. Once the bolt has been torqued to spec, it cannot be reused.
However: I re-used mine when I built my D15B7. Haven't had the first problem with leaks or anything. I torqued them 1'lb higher than spec. Don't try this at home, I'm just a cheapa$$ ba$tard. Make sure you oil the hell out of them before torqueing or you could snap them without even reaching the torque spec.
OEM bolts stretch. Most ARP's can be re-used because they don't.
However: I re-used mine when I built my D15B7. Haven't had the first problem with leaks or anything. I torqued them 1'lb higher than spec. Don't try this at home, I'm just a cheapa$$ ba$tard. Make sure you oil the hell out of them before torqueing or you could snap them without even reaching the torque spec.
OEM bolts stretch. Most ARP's can be re-used because they don't.
I'm made of meat!
Joined: Mar 2003
Posts: 3,580
Likes: 0
From: Richmond, VA
But ARP's don't stretch like OEM bolts do that stretch and stay stretched. ARP's are flexible enough to return to their original shape when you take the load off of them. That's what I meant by "they don't stretch". Any bolt or stud will f#$^ up if it's over-torqued, though.