[Vwdiesel] Head bolt torque Values
r.c.brown at ieee.org
Tue Jun 22 21:28:24 PDT 2010
Erik Lane wrote:
>> 11mm bolts get a three step torque. 37, 52, 66 but I usually go a
>> little closer to 70 (ft/lbs). Warm it up then recheck at 66 (or your
>> slightly higher number) then drive 600 miles and recheck again.
>> 12mm (stretch) bolts get 30, 44 then 180 degrees, warm up an
>> 90 degrees, 600 miles and 90 degrees more.
> And those extra 180, 90, and 90 degree turns *REALLY* feel wrong when
> you're doing them! If you're used to the feel of the metal it's VERY
> scary and feels like you're about to do some serious damage as the
> metal is stretching. I've never yet had a problem when following the
> procedures in the Bentley, but I cringe every time I have to do one of
> those stretch bolts. They just feel wrong.
That is why I like the head studs (Raceware or ARP). They torque down so nicely and just
3 steps, 20, 35 and 50 ft.lbs. and then re-torque to 50 after running the engine to temp.
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