Plastic cone fell inside front diff (1 Viewer)

Joined
Jan 27, 2020
Messages
37
Location
CA
I was almost done with my front diff fluid flush when the black plastic tip from the Mobile 1 75-90 quart fell into the front diff fluid hole.

Has this happened to anybody on here before? I saw a thread about a tip in the t-case, but didn’t find one on the front diff. Will the tip get chewed up safely and somehow spit out next time I flush the fluid? Or should I try somehow to fish it out?

Any tips would be GREATLY appreciated. It’s not my daily driver but I don’t want it to sit for weeks. I don’t want to have to pull the diff apart for this but if I have to, I guess I’ll have to figure out a way to do that.

Before anybody flames me for not using a gear oil pump for this job (which I have!!), rest easy on the fact that I also accidentally punched myself in the nose with the breaker bar this morning while loosening the old diff drain plug.
 
Joined
Jul 4, 2019
Messages
658
Location
Lexington KY, Boston MA
Damn man, rough day.

If I had to bet I’d say you could forget that it ever happened and nothing would ever come of it.

Little plastic cap<everything in that diff

But even feeling that way about it, I know if it was my truck it would bug me so bad I’d have to get it out.
 
Joined
Nov 9, 2012
Messages
11,267
Location
Olathe, KS, USA
Personally, I would drain and flush until it's out. Otherwise it will end up in the front pinion bearing and could block oil flow. I've seen a bunch of crap kill differentials, although a plastic cap is not one of them.

It would bug me to no end to have it in there.
 
Joined
Jan 27, 2020
Messages
37
Location
CA
Personally, I would drain and flush until it's out. Otherwise it will end up in the front pinion bearing and could block oil flow. I've seen a bunch of crap kill differentials, although a plastic cap is not one of them.

It would bug me to no end to have it in there.

It’s already bugging me to no end. Spent the last couple hours flushing and draining trying to get it out. Tried feeling for it with a coat hanger too and no luck.
 
Joined
Jan 23, 2020
Messages
97
Location
Japan
You could use a siphon pump to flush it out. Clean the bottom of your diff (so you don't introduce contaminants the might fall in), put a clean wide opening pan underneath it, prop it up so the fluid drains to one side. Put the intake of the siphon pump in the pan, and the other end in the filler hole, pump away until you see the cap fall out. You may need to top it up a bit just because some of the fluid will stay stuck in the siphon.
 
Joined
Nov 9, 2012
Messages
11,267
Location
Olathe, KS, USA
It’s already bugging me to no end. Spent the last couple hours flushing and draining trying to get it out. Tried feeling for it with a coat hanger too and no luck.
You'll need to rotate the diff. If you have open diffs, it may be sitting on top of the gears in the carrier. It would float on gear oil.

Maybe use a lighter weight oil to flush because gear oil is so sticky. Or diesel or kerosene. I hate suggesting it, but maybe........

Maybe compressed air, maybe not. Could blow it up there for sure......
 

flintknapper

SILVER Star
Joined
May 22, 2004
Messages
10,105
Location
Deep East Texas
It’s already bugging me to no end. Spent the last couple hours flushing and draining trying to get it out. Tried feeling for it with a coat hanger too and no luck.


There are two trains of thought here:

1. It's soft plastic, IF it ever goes through the gears it CAN'T harm them, it will (over time) be crushed into tiny pieces. There aren't any passages for the particles to block, the rear gears and bearings are either submerged in (or pick up) heavy viscosity gear lube. Your front pinion bearing (at highway) speed will be rotating between 2,000-3,000 rpm (depending on road speed), nothing is going to stay in a bearing and the plastic can't cause wear on it.

2. It's a foreign object (even if benign) and on principle only...I don't want in there.

If you subscribe to thought #2 (nothing wrong with that) then by all means remove it. Drain the diff and use a bore-scope to locate the cap (if you're lucky). For all we know it's sitting in one of the axle tubes right now, could be anywhere. Once located...then you can formulate a way to retrieve it. After you retrieve it...have it mounted on a plaque because you will have spent a monumental amount of time trying to capture it. ;)

And in all seriousness....I am not chastising or making fun of you. If you really can't stand the thought of it being in there, go get that sucker. But don't do it on the basis that it will harm anything if left alone.
 
Joined
Jun 26, 2004
Messages
1,986
Location
east coast Canada
That ain’t gonna flush out!
Only way is pull the diff, it would be different if the drain plug was directly on the bottom but it’s not, it’s gonna sit in the center for ever even if you flush a gallon of fluid through it.
 
Joined
Jan 27, 2020
Messages
37
Location
CA
That ain’t gonna flush out!
Only way is pull the diff, it would be different if the drain plug was directly on the bottom but it’s not, it’s gonna sit in the center for ever even if you flush a gallon of fluid through it.

That’s the same thing I was thinking as I was flushing yesterday and just looking at the diff. Looks like if it would need tons of pressure and a lot of luck for it to move from the bottom of the diff over to the drain plug exit.
 

flintknapper

SILVER Star
Joined
May 22, 2004
Messages
10,105
Location
Deep East Texas
That’s the same thing I was thinking as I was flushing yesterday and just looking at the diff. Looks like if it would need tons of pressure and a lot of luck for it to move from the bottom of the diff over to the drain plug exit.

There are also certain immutable laws at play : If you DIDN'T want it to come out.....it would. ;) But since you DO...well you know the story.
 

Heckraiser

SILVER Star
Joined
Aug 5, 2010
Messages
5,124
Location
Colorado
drain all the fluid, open the fill hole and the drain hole, blast compressed air into the fill hole and see if it comes out the drain hole? Kinda sounds like a fun game.
 

Users who are viewing this thread

Top Bottom