821 Power Steering Cylinder

Diggerdon · Oct 29, 2022

Have an 821 and I need to rebuild the power steering cylinders. Both are leaking inside cylinder. I ordered seals needed for the end of the cylinder. Can anyone tell me which end of the cylinder I cut off, to remove and replace the rod inner cups? I will braze back on after replacing the inner cups. I have not found a clear picture of the inner cylinder to know the end to cut off.

rufus80 · Oct 30, 2022

The inner piston seals are cast iron rings, not rubber seals. The cylinder is made with
a tube within a tube. If your going to cut apart I would cutoff the base end, not the
rod end. Also I would not braze it back together, I would weld. I have done dozens of
these mainly to replace a broken or bent shaft. They used cast iron piston seals so
there would be no need for maintenance.

Diggerdon · Oct 30, 2022

If it is leaking inside can the cast iron seals be replaced? When you cut the end, do you only cut the outer tube or cut the end clear off?

rufus80 · Oct 30, 2022

Only the outer tube, I put them in a lathe and part them off. A good hydraulic shop should be able to get you new cast iron piston rings, they were never available from Ford. They expected you to buy new cylinders if truly bad on the inside. Not to discourage you but this job is precise, can't cut off to much from outer barrel because the inner one fits onto a step. Remove to much and you'll have to shorten the inner one.

Diggerdon · Oct 30, 2022

Thanks for the info. On a budget, I will give it a try and see what happens.

Diggerdon · Oct 31, 2022

Cut open cylinder, removed rod. What parts do I replace on the rod? Inner cylinder and cast-iron cup with ring, look awfully pitted. Going to try brake cylinder hone to take out some of the pits.

821 Power Steering Cylinder

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