using extentions on torque wrench cause headgasket leak

natestang5.0 · Jul 17, 2006

is it possible that when i used different extentions when i torqued the heads down that, it was enough difference to cause a leaky head gasket.

Roland69 · Jul 17, 2006

shouldn't

mattmcdan · Jul 18, 2006

If you used the proper size 1/2" drive torque wrench I'd say no, but if you used some wimpy 3/8" drive with an extension, I'd say yes you were probably flexing the extension. Did you do the proper torque sequence when tightening them? That is usually the cause of a head gasket installation gone wrong. my .02

Blk91stang · Jul 18, 2006

If you use a very small extension you will not have any problems. Now if you are using like a 8" extension, I would go 5 ft-lbs more torque on every bolt/stud just to compensate.

natestang5.0 · Jul 18, 2006

thanks i did the proper sequence and i used the 1/2

Tonys96Cobra · Jul 18, 2006

Rule of thumb is increase torque 1/2 lb for every 1" of extension used. The torque spec for the headlbolts is 65-72 on the final sequence, so even with a short extension and no increase you will still hit the 65, so I would say unless you had like a 12" extension, thats not the problem.

Roland69 · Jul 18, 2006

Tonys89GT said:
Rule of thumb is increase torque 1/2 lb for every 1" of extension used. The torque spec for the headlbolts is 65-72 on the final sequence, so even with a short extension and no increase you will still hit the 65, so I would say unless you had like a 12" extension, thats not the problem.

That's some good advice

natestang5.0 · Jul 18, 2006

my haynes manual only said to torque them to 59 ft lbs maybe thats the prob

Tonys96Cobra · Jul 18, 2006

natestang5.0 said:
my haynes manual only said to torque them to 59 ft lbs maybe thats the prob

The firt time Is 55-59. The second round is 65-72.

natestang5.0 · Jul 18, 2006

are you 1oo% sure because i can't find that in my haynes. are you goin by the haynes or some other book. If so i need to go torque them all back down.

sgarlic · Jul 19, 2006

The rule of compensating torque when using an extension on a torque wrench refers to when you change the drive end length of the wrench, i.e. using a breaker bar on the wrench for added torque. When that's the case, you use the formula

S=

T x La
-------
La x Ea

S being your answer, T is torque applied at end of adapter, La is length of handle, and Ea is length of extension in inches.

I've never heard of adjusting final torque when using just a socket extension.. then again we go strictly by the book only where I work.

BlownFiveLiter · Jul 19, 2006

I've never heard of increasing torque values based on using extensions... but I'm not a machinist either. When I installed my heads, the torque specs were in three steps. They went 35, 50, 70lb/ft and then for the long bolts, increase torque by 10lb/ft.

2002BLGT · Jul 19, 2006

I use a 6 inch extension and torque them all to 80ft lbs , never had a problem that way ......

luckythirteen13 · Jul 19, 2006

natestang5.0 said:
are you 1oo% sure because i can't find that in my haynes. are you goin by the haynes or some other book. If so i need to go torque them all back down.

yes! the final torque should be 70-75ft/lbs

using extentions on torque wrench cause headgasket leak

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