Rear Differential Fill Level ?

[tiredguy]

Hello

For the life of me I can not understand / interpret the fill level diagram below.

The vehicle is a 2006 Nissan Frontier 2WD.

In particular I don't know how to read the box in the upper right that is labeled "Filler opening / Oil level". In this view I don't see where the fill plug hole is or any other reference.

Do any of you understand this and can explain?

 

[xmanjeff]

fill it to where the guys finger is , filler opening is on top , but i dont see any reason that you couldnt fill from rear hole
i install a good many gearboxes on indutrial equipment , and the install manuals show many diagrams similiar to this,

 

[Jetronic]

halfway up the drive shaft bearing, pretty sure it's also the level of the filler.

 

[Rand]

basically just below the hole on the cover

 

[GSCJR]

Slightly below the fingered opening (level check window).

 

[tiredguy]

thanks everyone

I'm still hung up on the small picture caption in the upper right. Where is the fill hole in that view?

 

[tiredguy]

fill it to where the guys finger is , filler opening is on top , but i dont see any reason that you couldnt fill from rear hole
i install a good many gearboxes on indutrial equipment , and the install manuals show many diagrams similiar to this,

the fill hole is the rear hole where the finger is

 

[DemoFly]

2 holes. There's a drain and a fill/level. Just fill it until it comes back out the oil level. It's impossible to overfill. You're technically supposed to fill these until they are about a knuckle below the oil fill hole but nobody ever does that because its pointless.

 

[DuckRyder]

They want you to fill it to the bottom of the fill hole on level ground.

They are trying to say check that its at the botton with your finger.

In real life everyone for the most part just fills it until fluid dribbles out and puts the plug in.

 

[skyactiv]

2 holes.

One is fill on the back above the pinion.
One is oil level.

Pop both open, fill up top until gear oil comes out the oil level hole on the diff cover. Impossible to overfill.

Correct unless you're on a hill. Do the job on level ground and you'll be fine.

 

[dbias]

I'm still hung up on the small picture caption in the upper right. Where is the fill hole in that view?

It’s on the other side from where the guy is sticking his finger in. I’ve never seen one there. If it’s been emptied you should fill it where he is sticking his finger in till it runs back out. Install plug and drive it a short distance to ensure the fluid reaches the outer portion towards the wheels and refill again till it drains out.

 

[tiredguy]

according to the factory manual the fill hole is not above the pinion,

see below

 

[DuckRyder]

 

[tiredguy]

also they recommend to use RTV on both the drain and filler plugs

 

[DemoFly]

according to the factory manual the fill hole is not above the pinion,

see below

View attachment 243647

Correct, I edited my comment. I didn't understand the unnecessary cutout on the diagram.

The fill hole and the oil level hole are the same hole, like a standard differential. You're supposed to fill all differentials until they are about a knuckle below the oil level hole, but nobody ever does. Just fill it until gear oil comes back out the hole at the same rate you're adding it. It will start to come out prematurely, and you may think you're done, but if you wait or rotate the tires you'll see it settles and you can add more.

 

[DuckRyder]

I believe the inset diagram is meant to illustrate a level diff and the fill hole, it looks odd because of a poor attempt to illustrate the flat area next to the ring gear protrusion....

 

[Hall]

Where is the fill hole in that view?

It's not shown. This is what it should look like:

 

[meep]

Ok I see the confusion. The drawing makes it look t like there’s a fill hole on the top of the housing towards the front. No such beast - the line for “oil level” is just pointing at the oil. There’s not actually a hole there where the line goes across the top of the housing. $0.02.

 

[tiredguy]

I think I understand it now,

Is the the fill hole where I drew the red line?

 

[DuckRyder]

The original illustration is correct, the fill hole in the illustration is the gap above the fluid level in the flat area. The bulge is the ring gear bulge which is seen next to/behind the flat area.

See #14 in the parts illustration and the opening photo in my linked you tube video.