Grar oil leaking from conpainon flange

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

flash02

flash02

10 Year 15 Year
Joined
Sep 8, 2006
Threads
67
Messages
588
Location
Elizabeth City, NC
I noticed oil on the under side of my 4runner, it would appear as though it is leaking, spraying, from the companion flange of the rear drive shaft, so being the nifty mechanic that I am I replaced the oil seal on the output side of the transfer case but it is still leaking. Would it be safe to assume that the flange is worn thus allowing oil to leak past the new seal? The truck is an 86 4Runner 5spd with well over 200k on the clock. I've heard that the transmission can actually pump oil into the transfer case when a seal goes out which would over fill the transfer case, if this has happened to my truck would this be one of the symptoms? I do not have oil leaking from any other part of the transmission, jut the rear companion flange, would over torquing the flange nut cause this issue? Oh and yes I did put sealant on the flange splines when I installed it.

Sent from my iPhone using IH8MUD
 
Did you happen to check the flange to see if there is a groove at the sealing surface? Also, is there any play in the bearing just inboard of this flange, that would allow the flange to wobble? Did you check the fluid levels in the transfer and tranny? Did you use an OEM seal?
 
KLF said:
Did you happen to check the flange to see if there is a groove at the sealing surface? Also, is there any play in the bearing just inboard of this flange, that would allow the flange to wobble? Did you check the fluid levels in the transfer and tranny? Did you use an OEM seal?
Click to expand...

I do not recall a groove on the flange, I did use a Toyota seal, no I did NOT check the oil level in the transfer case, however I did check the transmission oil, and it was not low. My plan is to check the transfer case this weekend, that should tell me for sure if I'm transferring fluid. This leek seems to be a dynamic leek as I can't feel any fluid around the flange, it is only showing up on the underside of the floor pan right above the flange.

Sent from my iPhone using IH8MUD
 
While you're under there, check the output bearing for play. Try to get the drivetrain totally relaxed, ie: jack stands under the rear axle, trans in neutral. There should be very little play back and forth. That bearing isn't difficult to change, you can pull off cover #4 to get to it, can be done while the transfer is in the truck.

I don't recall oil leaking from the tranny to the transfer being an issue with the W-series trannies.
 
KLF said:
While you're under there, check the output bearing for play. Try to get the drivetrain totally relaxed, ie: jack stands under the rear axle, trans in neutral. There should be very little play back and forth. That bearing isn't difficult to change, you can pull off cover #4 to get to it, can be done while the transfer is in the truck.

I don't recall oil leaking from the tranny to the transfer being an issue with the W-series trannies.
Click to expand...

Will do, that's nice to know it can be done without removing the transfer case. I thought I read that a seal between the two could start to leak, an indication would be oil leaking from where the shifter is. I know the FJ 40's had similar issues.

Sent from my iPhone using IH8MUD
 
2ndGenToyotaFan said:
When you put the flange back on, did you use any sealant on the splines? Oil can find it's way out the splines, around the nut, and come out between the flange and the driveshaft.
Click to expand...

Yep, sure did. Strange bit is that that the only place oil can be found is on the under side of the truck, so it is obviously being slung by the drive shaft, still I would think that the drive shaft flange would be wet as well.

Sent from my iPhone using IH8MUD
 
You must log in or register to reply here.

Share this page

Back
Top Bottom