cylinder head bolt torque

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JP - 30 Oct 2007 03:26 GMT

I'm ready to bolt the head back on to my 86 Accord, but when consulting the
shop manual (original shop manual from Honda) I find information that may be
contradictory. On pages 6-2 and 6-16, the head bolts are referred to as 10
mm with 1.25 mm thread pitch, however I the bolts I removed are 11 mm with
1.5 mm thread pitch.

Given that the bolt size and thread are wrong in the manual, should I
believe that the torque specified is correct (22 then 49 ft-lb)? I would
think that the proper torque would be different for various bolt sizes and
particularly for a different thread pitch.

JP

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jim beam - 30 Oct 2007 03:45 GMT

> I'm ready to bolt the head back on to my 86 Accord, but when consulting the
> shop manual (original shop manual from Honda) I find information that may be
> contradictory. On pages 6-2 and 6-16, the head bolts are referred to as 10
> mm with 1.25 mm thread pitch, however I the bolts I removed are 11 mm with
> 1.5 mm thread pitch.

my money says those bolts are exactly what it says in the manual and
that you're using the wrong part of the caliper jaws to measure.

> Given that the bolt size and thread are wrong in the manual, should I
> believe that the torque specified is correct (22 then 49 ft-lb)? I would
> think that the proper torque would be different for various bolt sizes and
> particularly for a different thread pitch.

use book torque. use a bending beam torque wrench, not the clicky kind.

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