checkmate1996

Anyone know the torque specfication for engine mount bolts for the OB style cross member?

'79 928...

mulik51

I think on bolts like this I would just tighten them till they tighten...
They are big, and steel to steel so, the only thing you should worry about is them unbolting. By tightening them hard there should be no worrys. That's what I did

Klim

SharkSkin

I think that falls in the "All other nuts and bolts" category:

M6: 6-7 ft-lbs
M8: 15-16 ft-lbs
M10: 30-34 ft-lbs

If you're worried about them coming off, replace any lockwashers that may be on there, and maybe add some Loctite blue.

mulik51

I thought about that, but I think M10 is camshaft size bolt and the engine mounts(to crossmember) is WAY bigger. I think the correlation of the M size and wrench size is like this: M6-10mm, M8-15mm, M10-17mm. I think the mounts bolts are 19mm or even bigger...
I am sure about the sizes though...correct me if I am wrong.

Klim

Bill Ball

In general, bolt torques

17mm head (M10) = 42 ft lbs
19 mm head (M12) = 62 ft lbs

There's a range, but these are good.

M8 is 13mm bolt head

As I recall, those torques applied to all the crossmember bolts when I did the MM.

macreel

checkmate...

Tech spec book, your year:

other categories, M6 6 nm
M8 = 20 "
M10 = 40 "


G'luck.

Bill Ball

Eh, do I have the M10 torque too high? Alzheinmers is really statting to hit me hard lately.

macreel

Bill... no, don't think so. The book
allows +2 (- 0)nm.


G'luck

SharkSkin

Whoops... I think the numbers I quoted were for bolts going into aluminum.