Home

1971 Body/Chassis FSM

1971-74 F Engine FSM

Page Index

 

Marfield Tack to Inner Axles

Since I already had the front axle torn completely down it would be foolish to not do the Marfield Tack Mod. If you don't know what this is then go to the IH8Mud site and check out the Axle/Drive Train section or go here for the actual article. Basically what this does is allow you to leave out the #$$%@ inner axle clip when reassembling the Birfield to inner axle. This will make repairing a broken Birfield in the field much easier! * Note: My first attempt at this was incorrect. I put the tack too far out and the spindle would NOT go all the way on! When I took it apart I had put the tack 1 1/4" not 1 1/2" Grrrrrrr. 

Marfield Tack

Ready To Weld

Fig. 1

Ready To Weld

Top Tack Welds

Fig. 2

Top Tack Welds

File It Down

Fig. 3

File It Down

Engagement Depth

Fig. 4

Engagement Depth

Rear Engagement

Fig. 5

Rear Engagement

  1. Fig. 1 shows the axle cleaned and clamped ready to weld. 
  2. Fig. 2 and Fig. 5. I used an old spider gear to precisely place the tack weld. I used 4 tacks, two top and two bottom spaced several splines apart.
  3. Fig. 3 You MUST grind down the welds to the height of the axle splines or you will tear the axle seal when installing it.  This is actually very easy. Use a hand file ONLY! Start filing it down.  As you get to the height of the splines you will notice something cool, the axle has been hardened! The file will sort of skate over the hardened splines providing you with an excellent way to tell you have filed down far enough.  A file WILL eventually start eating into the splines so don't get carried away!
  4. Fig 4 shows full engagement of axle to spider gear which is what you want. It also shows the tell tale signs of the axle hardening process. See the concentric 'rings' of discoloration on the end of the axle?
  5. Fig. 5 just shows the axle to spider gear engagement from the rear.

Don't place large tacks on the axle! First you don't want to heat the axle to the point that you undo the heat treating and second, you sure have better things to do with your time than file them down!

Next Up: Brake Master Cylinder Rebuilding...

 

 

Home

1971 Body/Chassis FSM

1971-74 F Engine FSM

Page Index

Hosted by Global Software, Inc.

©1998 - 2023 Mark C. Baker Web Designer

Please: No part of this web site may be used without express permission... email mbaker@globalsoftware-inc.com for permission.

www.globalsoftware-inc.com