Thread: Transfer case filler plug

Originally Posted by david7307

I am going to check the oil in my transfer case this week , and from memory of last time, its a hard job getting filler plug out, i used a half inch drive head to remove it , can you replace plug with a standard bolt like plug and just use a spanner to undo it ,and if so what size of thread is it

I did mine last week with no problems, I don't think you will be making it any easier with a bolt. Nick

Use a 5/8” extention bar and ratchet with 1/2” adaptor on the end of it. Easier to get it square than using 1/2” gear

Pretty sure it's 3/4" BSP, any plumbing shop should have something suitable in brass. But I bet the original plug would seal better as it's made for the job.

Originally Posted by david7307

I am going to check the oil in my transfer case this week , and from memory of last time, its a hard job getting filler plug out, i used a half inch drive head to remove it , can you replace plug with a standard bolt like plug and just use a spanner to undo it ,and if so what size of thread is it

Hi David,

I have also had difficulty with this (every time) - my transmission brake housing gets right in the way.

In contrast to the 5/8 inch idea, I think a 1/2 inch sq drive universal with male ending works pretty well.

Just put the 1/2 inch male ending into the square recess in the plug.

Cheers,
Andrew

Originally Posted by ballbag

Use a 5/8” extention bar and ratchet with 1/2” adaptor on the end of it. Easier to get it square than using 1/2” gear

I’m guessing you meant 3/8 not 5/8 but anyway that’s easiest way I’ve found too

Just use a long 1/2" wobble drive, gets you past the parking brake drum easily.

Originally Posted by rick130

Just use a long 1/2" wobble drive, gets you past the parking brake drum easily.

x2

I think the brass diff filler plugs are the same.
Search for discovery brass diff plug .. or something similar you get many hits.
Same brass pugs are used on the D1 radiators and on some of the D1 engine bleeders.
They're a better replacement plug type for the plastic ones LR fitted originally.

Some D1's use those 1/2" drive filler plugs on the diffs too.

Can't remember the size of the hex head tho .. something like 7/8ths or similarly large so if you go that way, just make sure you have a ring spanner to suit.