In message <2ufmv05jcg45l2p6ab0fc0mge8ml1pdqab@4ax.com>
Austin Shackles <austinNOSPAM@ddol-las.net> wrote:
>
> OK, anyone got a definitive answer?
>
> 2.4 VM turbodiesel, the bloke about to do work on my mate's one says that
> they use stretch bolts and thus the heads don't need re-torquing after a
> run-in period.
>
> true or false?
>
True(ish)... here's the info (you'll love this....):
Tightening Sequence
11 11 11 11
1 9 3 7 5
10 2 8 4 6
11 11 11 11
Tighten 1 to 10 in sequence to 29 lb/ft
Tighten again in sequence by 40 to 45 degrees
Repeat again in sequence by 40 to 45 degrees
Tighten smaller bolts (11) to 58 lb/ft in criss-cross
sequence.
Fit all the gubbins.
Fill fluids
Run the engine for 15 mins or at least 5 miles.
Allow to cool for at least three hours.
Tighten bolts 1-10 in sequence through 15 to 20 degrees
Tighten bolts 11 to 65 lb/tf in sequence.
Dire warning - if one head gasket has been changed, all
4 must be.
I wonder how often the above gets done properly, and
why the VM has a reputation for blowing head gaskets......
Richard
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