rixcj
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I decided to go through a Dana 20 transfer case(new gaskets and seals) before I install it in my jeep.
I bought a Omix-Ada kit(gaskets not too impressive). I took off the front output yoke, removed the old seal, felt, and gasket. I cleaned the gasket(a ring gasket that sits against a shoulder that was still in good shape), and the felt, to re-use.
The new seal is a double seal( 1/2" thick)vs. the single seal( 1/4" thick) that was in there. There appears to be plenty of room to accept the thicker seal. I installed it just slightly below flush with the yoke collar mounting surface. The original seal was in a little farther ( about 1/4" more).
The yoke slipped back on nicely, no apparent problems. As I started to torque the yoke nut to 240 ft. lbs., at about 20 or 25 ft. lbs., the yoke became very firm to turn( by hand). So I stopped.
What's going on here? Should I take the yoke back off and set the seal in farther? Any other suggestions? Thanks for reading all this.
tufcj
I believe the bearing preload is set with shims under the bearing on the yoke end. You need a thicker shim under the bearing to get the bearing preload correct. There is a spec. Too loose, the output will wobble and destroy the seal. Too tight, you burn up the bearings. It's just like setting up a pinion gear in an axle.
Bob
tufcj
rixcj
Thanks for the reply! I didn't get into the bearings, just the oil seals. I didn't have the seal pressed in far enough. Apparently the yoke was pressing against the seal, which I set in about 1/16". I went back and set it in to about 3/16" from the edge of the casing. That seemed to work out well.
The front output had a large felt gasket(?) behind the seal,originally. It's the same size as the seal. I replaced it, but it is more compressed now due to the fact that the new seal is twice as thick as the one I took out. Hope this is OK. The rear output didn't have one. Maybe someone else took it out in the past....What does that felt do, anyway? Could I have left it out?
tufcj
The front seal is always submerged in oil. The felt absorbs the oil, swells a bit, and helps keep too much oil from inundating the seal. It would probably leak without it.
Bob
tufcj
