Torque Specification Dana 27 Power-Loc

I am rebuilding a Dana 27 Power-Loc and need the torque for the bolts that hold the case together.

I have been looking for a service manual, but have not been able to find one...

Please let me know if anyone has a referance?


toolman_ar

 

Pictures are always fun

 

Not sure I'm heading you in the right direction, but take a look at http://www.drivetrainshop.com/Dana_27_s/84.htm ----a one page look at the Dana 27

Would be nice to have something like this Dana 44 manual for your Dana 27 Power-Lok and also have torque specs. http://clubs.hemmings.com/potomacramblers/Tech Tips pdf_img/trak-lok_diff_5313-3.pdf
--Hoping someone will be able to direct you to the specific manual and torque specs.

 

From an early 60's FSM..........

"j. Install the differential case bolts and turn them in a few threads. Using the axle shafts from the vehicle, align the splines of the side gear and the side gear rings. With these axle shafts in position, tighten the differential case bolts evenly and adequately torque to 35 to 45 lb.- ft. Remove the axle shafts."

This is what the book says. That's all I can you. Never done it myself but, I'm about to.

 

The 1977 Service Manual doesn't specify the Dana 27, but it agrees with wheelie's notes above regarding the Power-Lok differential--"With these axle shafts in position, tighten the differential case bolts evenly. Torque to 35 to 45 lb.- ft."

 

Wheelie has it spot on. Don't be surprised if the side gears and clutch rings move a bit and bind the axle shafts so they don't want to come out. The key is to criss-cross tightening the bolts only about 1/2 turn each until tight then torque in a similar fashion. It may still happen though. Also make sure the threads are absolutely clean and oil free on the bolts and in the case and use a good threadlocker to keep them from loosening later.

 

Wheelie

And everyone else.

Thank you for the numbers.

This is my second one to do. They can be persicity to get things aligned.

Toolman_ar

 

So, what do ya do if the axle gets stuck in there, Nick? Take it apart or can you loosen the bolts to free things up then, begin to retighten things? Kinda work the axle shaft as you are tightening the bolts?

 

Are the bolts left handed for the Powr lok case?

 

I don't know Chris.

Toolman, do happen to have the bearing and race numbers for the carrier bearings? What is your gear ratio (not sure if that matters in regard to a series 3 vs series 4 case)?

 

This unit came out of a Scout 80, Dana 27.

The threads are right hand on this case.

The gear ratio is 4.27, from the doner housing. I am going back with 5.38's.

Actually I am attempting to put this into a Dana 25.

I can note the carrier bearings for you.

toolman_ar

 

Wheelie,

The race number is LM5013111

The bearing number is LM501348

These are both Bower part numbers

 

Pretty much. The other thing you can do is take a mallet and tap the axle shaft back and forth until it loosens up. This helps to align the clutch and side gear splines and alleviate the binding. I have cut off axle shafts I use for alignment purposes. I also have one modified for 27 and 25 Powerlocks I can put a torque wrench on to check the breakaway of the clutches (preload check).

 

Thanks tool man. Thanks Nick.