A-25 Prop shaft coupling torque?

[NickScheuer]

Anyone have an idea as to proper torque for the four socket head bolts that attach an A-25 prop shaft to the V-P MD17C MS transmission?

[WillieC]

From the MD Engine Service manual:

Tightening torques
Tightening torques for vital joints that must be
tightened with a torque wrench are listed in workshop
manual “Technical Data”: “Tightening Torques” and
are contained in work descriptions in this Manual. All
torques apply for cleaned threads, screw heads and
mating surfaces. Torques apply for lightly oiled or dry
threads. If lubricants, locking fluid or sealing com-
pound are required for a screwed joint this information
will be contained in the work description and in
“Tightening Torques” Where no tightening torque is
stated for a joint use the general tightening torques
according to the tables below. The tightening torques
stated are a guide and the joint does not have to be
tightened using a torque wrench.
Dimension Tightening Torques

Nm ft. lb.
M5 6 4.4
M6 10 7.4
M8 25 18.4
M10 50 36.9
M12 80 59.0
M14 140 103.3

(The format is not happy, hope you can decipher it.)

I installed a R and D Engineering shaft saver and did not have crow's foot wrenches at the time. PITA, so I got them as tight as I could with box wrenches and bloody knuckles. Fine after three years.

[honza]

For the coupling, I would think it safe to use the recommended torque according to the bolt size and grade. Torque chats are quite easy found on the web.