CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.
NP208 leaky output shaft seal
- Thread starter DirtyK5
- Start date
Dabba
1/2 ton status
sure it is the right seal? did you gouge the case seat around the seal? I just did my front output shaft, and 20 year stuck bolts aside and getting the seal out it was a faily easy job, and no leaks
TDAWG1
1/2 ton status
Yeah and also 208 is notorious for leaking consider yourself lucky to have one that does not or did not leak. Mine was nice until I had to replace it now leaks like crazy.
There is a steel plug in the output yoke. Often times they leak, requiring brazing or welding in order to seal. In a 208, the fill level is above the yoke so there is hydraulic pressure every time the drive line compresses into the case. There are a lot of threads on this board about this type of leak.
To check, clean the yoke fill it with ATF and apply some moderate air pressure. If it leaks, clean it up and weld it.
To check, clean the yoke fill it with ATF and apply some moderate air pressure. If it leaks, clean it up and weld it.
the new seal wnt in tight, its the rubber seal around the shaft. I can see where it is coming from... Its not super bad but, it is leaking and makes an oil spot where ever I park, not to mention in my driveway.
Dabba
1/2 ton status
the rubber thingy on the end of the output shaft? Think you can get a new one..
Lunatic
1/2 ton status
I just magically resolved my own issue. 208 rear output. It leaves a drop at the base of the seal, as if it seaps, not leaks, then eventually drips.
In all honesty, I have no idea what the differences in seal brands are - But, I do know my own no longer leaks after switching brands on the fifth replacement.
I had suggestions of checking the shaft bearing for play - Which would give the shaft minimal slop and therefore seap on the seal's edge, checking for grooves, balancing the shaft and such. Nothing fit the bill.
I previously took my seals from Advance Auto and O'Reilly's. This last one, which I replaced for GP when I had the transmis/fer pack down for a rear main leak - hasnt leaked yet. I was past trying to seal it up actually, until I had everything else dried up.
Now, my drive is spotless. The seal is a Timken brand, found at Autozone. Hopefully, you havent been there yet.
Hope this helps
Troy B
Ft Hood, TX
In all honesty, I have no idea what the differences in seal brands are - But, I do know my own no longer leaks after switching brands on the fifth replacement.
I had suggestions of checking the shaft bearing for play - Which would give the shaft minimal slop and therefore seap on the seal's edge, checking for grooves, balancing the shaft and such. Nothing fit the bill.
I previously took my seals from Advance Auto and O'Reilly's. This last one, which I replaced for GP when I had the transmis/fer pack down for a rear main leak - hasnt leaked yet. I was past trying to seal it up actually, until I had everything else dried up.
Now, my drive is spotless. The seal is a Timken brand, found at Autozone. Hopefully, you havent been there yet.
Hope this helps
Troy B
Ft Hood, TX
I am on my second seal. It had a 6" lift put on it and they didnt extend the drive shaft. My original concern that the shaft was wobbling a little since it only sat on the output shaft 2". So, I had the drive shaft extended and replaced the seal.. not sure of the brand but it wasnt a TIMKEN. ...and low and behold it still leaks. I know a leaking Chevy is a happy Chevy but... I want to fix it. I will give the TIMKEN a try, thanks.
supersize75k5
OrganDonorRacing.com
timken is a nice quality brand, or in my eyes and others has always seemed to be
Dabba
1/2 ton status
think thats what i used, no leaky for me
cegusman
3/4 ton status
x2 check the bushing. This is the number 1 cause for them to continue leaking after swapping the seal.
i had the same issue with my np208 so i thought after changing out the out put driveshaft seal and bushing. it turned out to be the plug on the slip yoke its self that was leaking. so what i did i had the local drive shaft shop weld in a new plug. but it still leaked a little bit. so what i had to do was i cleaned out the inside of the yoke with some brake cleaner let it dry. then i put some rtv hi temp down inside the yoke pressed it in all the corners about 1/4 in all around to make a good seal and presto no more leaks.... hope this helps. oh yeah its much cheaper then buying a whole new slip yoke.
isaac
isaac
unionrigger433
Newbie
There is a sleeve you can install on you slip yoke. it will add about a 16th" to the diameter of the slip yoke. im looking for the part number. it was called a speedy sleeve.
