head torque questions
06-03-2003, 10:57 AM
#1
Racer
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head torque questions
Im going to be installing my head in the near future. I have looked in Clarks repair manual pages and the directions say to torque the head in this manner for an 89 Turbo:
Step 1: 20 Nm (15 ft-lbs)
Step 2: 90° angle
Step 3: 90° angle
Could someone explain what the 90 deg. refers to. Im a little confused =)
Thanks for the help!
Step 1: 20 Nm (15 ft-lbs)
Step 2: 90° angle
Step 3: 90° angle
Could someone explain what the 90 deg. refers to. Im a little confused =)
Thanks for the help!
06-03-2003, 11:00 AM
#2
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Get a degree wheel from any parts store to attach to a breaker bar. You will turn it 90 degrees, or 1/4 turn.
The degree wheel make sure it is exact, and you don't have 80 degrees on one bolt and 100 degrees on another.
The degree wheel make sure it is exact, and you don't have 80 degrees on one bolt and 100 degrees on another.
06-03-2003, 12:18 PM
#3
Three Wheelin'
Since Perry has answered the question already, I'll throw in another question - Is it worth retorquing the head after a period of time following the installation of a new head gasket ? I imagine the usual answer would be no since removal of the cam tower and belts would be a pain whilst the engine is in the car but since I have my engine out and the cam housing off I now have an opportunity to retorque the head. It has 6000mi on it btw.
06-03-2003, 12:29 PM
#4
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That is the exact delimma I have now. After 1 heat cycle, you are "supposed" to retorque them. I really don't want to pull it all back apart, and I know they were done right the 1st time.
Anyone else have an opinion??
Anyone else have an opinion??
06-03-2003, 01:49 PM
#6
Burning Brakes
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since you torqued the bolts by turning them 90 deg and then again, to what would you re-torque them, if you were to do it? Who said you are "supposed" to re-torque them? Porsche does not.
06-03-2003, 02:30 PM
#7
Three Wheelin'
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When they say retorque I beleive they are referring to backing off the nuts entirely and retorquing them to spec. I would do this if you had new OEM studs because they stretch and when they stretch...but if you are reusing stock studs or aftermarket ones that don't stretch as much...i would think you should be fine.
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06-03-2003, 02:36 PM
#8
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Raceware and ARP both suggest that they be retorqued after 1 heat cycle.
Backing them off and doing the 15/90/90 again would be my suggestion, since we do not know the actual torque value.
Backing them off and doing the 15/90/90 again would be my suggestion, since we do not know the actual torque value.
06-03-2003, 06:13 PM
#10
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When I did mine, I used the torque wrench to do the 90 deg also. The final value I got on all studs was 90ft lbs. The variance was less than 1-2 ft lbs all the way across. Don't know if this helps but, I've never seen anyone post the final value before. I won't be retorquing mine.
