Torque Values

[Gene Gillam]

I've got a question on the torque values given in the Resource Technical Article file: http://www.mg-tabc.org/library/torque.htm

There it says that the 8mm rocker arm assembly bolts are to be torqued to 16 ftlbs.

The MG Y-type forum (http://www.mgccyregister.com/node/19016) gives the torque spec as 27 ftlbs.

David DuBois (http://homepages.donobi.net/sufuelpumps ... ngines.pdf) gives the torque spec as 19 ftlbs.

I also have a question on the 10mm rocker arm assembly bolts...our site tech article gives the torque value as 43 ftlbs. David DuBois concurs, the Y-type forum gives the torque spec as 42 ftlbs but the MG Cars site (http://www.mgcars.org.uk/imgytr/pdf/reassycheck.pdf) lists the torque spec as 30 ftlbs.

I'm sure there's other discrepancies throughout the specs but these were the only two I was concerned with today. Can someone verify WHICH is correct...and if our site lists the wrong torque specs please correct it.

Thanks,
Gene

[Tom Wilson]

Dave, as a general rule I follow both what the MG specs are in combination with modern ISO specifications. More times than not they are comparable.
So for an 8mm bolt dry is 19 ft pounds; a 10mm bolt 37 ft pounds.
Preferred method (I believe) is lubricated with a light oil - the values are then higher.
http://www.cncexpo.com/MetricBoltTorque.aspx for an example.
Tom Wilson

[Gene Gillam]

Dave?...think you mean Gene but that's okay.

Thanks for the info...

Steve...any chance on getting http://www.mg-tabc.org/library/torque.htm straightened out for future reference?

[Steve Simmons]

I can change the page to read however you like. But I wonder if there is a difference between torque values for original factory hardware and modern replacements. Perhaps that is the discrepancy? I also wonder about varying grades and materials of hardware.