I recently found an oil leak, in my BJ73 series Mid Wheel Base L/Cruiser (1990).
I did a bit of online research and found that when the internal oil seal, between the gear box and transfer case starts to leak, the oil tends to pass from the T/case to the G/box.
The first indication of this is that gear oil starts to overflow out of the gear lever extension, on the top of the gearbox.
Here is an image from another source, that's an example of this;
https://forum.ih8mud.com/threads/leakin ... lp.164584/
There are two options to repair this fault.
1) Pull the T/case off the G/box and replace the faulty oil seal.
or
2) Make and install an external oil transfer hose to allow the gear oil to drain back from the G/box back to the T/case.
Obviously, the former job (#1) is a major task but the latter (#2) achieves the same goal, and is a lot cheaper.
Here are some Before and After images that I hope explain the job itself.
My finger is pointing at the T/case Filler plug and the G/box Filler plug, is higher up on the left and side of the gear box.
- Left side of G/Box & T/Case, including leaking oil
- DSCN2031.JPG (558.69 KiB) Viewed 8959 times
Here is the external braided hose and various fitting (another option, is to use Banjo Fittings on each end).
- DSCN2030.JPG (537.08 KiB) Viewed 8959 times
So I purchased two new filler plugs and washers, and then drilled and tapped them for 1/4" NPT (Note the Cork Plug, for temporary plugging, of the filler plug hole/s).
- DSCN2034.JPG (946.99 KiB) Viewed 8959 times
I then removed the original Filler plugs and replaced them with the new modified plugs.
Once both new modified plugs were in place, I then attached the braided hose to the top (G/box) plug and measured it for the correct length.
I then removed the hose and cut it (with an Angle Grinder with a 1mm thick cutting disc), to the correct length
I then cleaned out any abrasives and other ground up crap, from inside the newly cut braided hose (ask me How, if you want to know), and attached the end fittings to the hose.
I then attached the hose and fittings, to the new filler plugs.
Here is a couple of images of the hose and new filler plugs in place. Please note that I have already degreased all the leaked oil, off the G/box etc.
- DSCN2035.JPG (578.71 KiB) Viewed 8959 times
- DSCN2037.JPG (559.42 KiB) Viewed 8959 times
Please note that and luckily, the G/box Filler plug is physically higher on the vehicle, than the T/case Filler plug.
Also, what we are doing here, is installing a Drain and Transfer Hose.
This only works because gravity allows the oil to flow down hill, from the G/box Filler plug hole, back to the T/Case Filler plug hole.
So remember, the hose always has to have a down hill angle/fall to it!
I then took the Battle Cruiser for a run and got back under it and checked for any oil leaks.
All looks to be OK so Homer is a happy lad.
Hope that helps
Doh!
Homer
