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MG MGF Technical - torque of head bolt

can someone give me the exact torque setting of a 1.8cc k-series headbolt & not the sequence for set up.

i.e. what the machine in the factory would set them at.
r.f.j. griffiths

Have a look at Tony's site -

http://www.apttony.co.uk/Servicing/Torques.html

These settings are the same as shown in my Workshop Manual.
David Clelland

the 20 newton meters ,
180 then 180 is wrong.

there is a final torque setting used by rover longbridge, its not top secret but i don't know the answer.

try rovers racing department, there more acurate than the dip stick dealers.
r.f.j. griffiths

When i looked it doesn't say the 180 is newton meters-it is degrees and is the second and third stages.
ninja

The way I read it is you tighten in the correct sequence to 20 Nm then you give another half turn in sequence then another half turn in sequence. As I said above this is the information given in the official workshop manual.
David Clelland

>>
the 20 newton meters ,
180 then 180 is wrong.

there is a final torque setting used by rover longbridge, its not top secret but i don't know the answer
<<

This is curious - as what you imply is that there is a serial error in all MG Rover/ Powertrain publications with regard to engine assembly?

Remember that these are not conventional head bolts, but through bolts to the baseplate (oil ladder) that sandwich all the other layers of the engine together. These bolts are subsequently very long - and are designed to stetch to enable equal loading across the cylinder head to maintain an even clamping load across all the cylinder liners over a wide range of operating conditions.

Under these circumstances, a final torque setting on the bolts is irrelevant and misleading. The torque settings specified in the K-series build manual (which includes two successive 180 degree turns following the attainment of the initial torque setting)is the most reliable method of setting the bolts at their correct elastic/plastic stretch point.

Of course, if you have information that supercedes previous advice, we'd welcome this - along with the source of that information.

Cheers
Rob Bell

This thread was discussed between 23/09/2006 and 25/09/2006

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