Diff breathers

ORSO · Feb 25, 2024

bnebenda said:
The thread in the diff housing is 10x1 parallel or 10x1 conic? Which size did you choose for the thread after the adapter? Any info on middle gear box or auto gear boc regarding breathers?

it's a normal 10x1 thread in Italy. I presume parallel.

the adapter is a 10x1 metric to 1/4 gas.

I still don’t understand if gearbox and transfer case has breathers. even if there were, they would be much higher than the differentials.

bnebenda · Feb 25, 2024

ORSO said:
it's a normal 10x1 thread in Italy. I presume parallel.

From the pictures it looks like you were using patchlock / loctiite? Did the original vents have any kind of (metal) seal or did you observe traces of patchlock? Did they come off easily?

ORSO · Feb 25, 2024

the original vents were attached without threadlocker and with very low torque.

I mounted the new fittings with engine sealant but they were already equipped with o-rings. No metal seal.

bnebenda · Feb 25, 2024

ORSO said:
the original vents were attached without threadlocker and with very low torque.

I mounted the new fittings with engine sealant but they were already equipped with o-rings. No metal seal.

From all I know about port sealing, if there is no taper on the male side then there must be a seal (either polymer or metal). On the pictures I found so far, the original breathers have no seal, hence I would assume they were tapered, howvever the bore could still be parallel. If you could insert your (parallel) adapter all the way, I would suspect the port is parallel in which case you can install a tapered breather without seal or a parallel breather but then yu need a seal (probably for a differntial I would use a metal seal).

ORSO · Feb 26, 2024

let's remember, however, that this system does not have compressed air inside, so in my opinion a little sealant is more than enough.

bnebenda · Feb 26, 2024

ORSO said:
let's remember, however, that this system does not have compressed air inside, so in my opinion a little sealant is more than enough.

I removed the (rear axle) breather and took a picture of the clean thread. I think from the picture one can conclude it is a M10x1c (conical).

Bernd

ORSO · Feb 26, 2024

good to know, I hadn't noticed

However, traditional threading does not have insertion problems

bnebenda · Mar 1, 2024

Diff breathers (front and rear) and in. Air is taken from the inside of the vehicle, avoiding any issues with dirt for the filters. I used existing holes in the back of the battery/electric box to feed the air (see pictures)

Bobby Mac · Mar 1, 2024

bnebenda said:
Diff breathers (front and rear) and in. Air is taken from the inside of the vehicle, avoiding any issues with dirt for the filters. I used existing holes in the back of the battery/electric box to feed the air (see pictures)

My only reservation with this would be the thought of the smell of diff oil fumes entering the cabin - the filter is only for matter, not odour, and diff oil really stinks! It may take a while before it is noticeable, but I think it would build up over time particularly in hot conditions, and would be hard to get rid of or mask!

bnebenda · Mar 1, 2024

Bobby Mac said:
My only reservation with this would be the thought of the smell of diff oil fumes entering the cabin - the filter is only for matter, not odour, and diff oil really stinks! It may take a while before it is noticeable, but I think it would build up over time particularly in hot conditions, and would be hard to get rid of or mask!

Good point, I‘ll keep an eye (nose) on it and move it to the outside if necessary

Tom109 · Mar 1, 2024

Bobby Mac said:
My only reservation with this would be the thought of the smell of diff oil fumes entering the cabin - the filter is only for matter, not odour, and diff oil really stinks! It may take a while before it is noticeable, but I think it would build up over time particularly in hot conditions, and would be hard to get rid of or mask!

This is true for cabin vented breathers and why no one dose this, more than once!

DenisM · Mar 1, 2024

bnebenda said:
Good point, I‘ll keep an eye (nose) on it and move it to the outside if necessary

It's not just the odour: the volatile components of the diff oil will, over time, diffuse through the cabin and settle on all surfaces. You don't want oil film on the windows or the seats.... I'm being polite: your solution is not a good idea. If you're worried about dust on the diff filters in the engine bay, then cover them with a piece of foam....

Tom109 · Mar 4, 2024

I ran the rear diff line this evening. Temporary ran it to the firewall in front of the driver (LHD). Tomorrow I’ll finish the front line and see if I stick with the same termination point.

I will say one thing, that Carraro breather fitting is certainly agricultural.

bnebenda · Mar 4, 2024

DenisM said:
It's not just the odour: the volatile components of the diff oil will, over time, diffuse through the cabin and settle on all surfaces. You don't want oil film on the windows or the seats.... I'm being polite: your solution is not a good idea. If you're worried about dust on the diff filters in the engine bay, then cover them with a piece of foam....

I took your (and others) advice seriously and rerouted to the engine bay:

Tom109 · Mar 6, 2024

DaBull said:
Hi Tom109, Like the way your going with this, please post install photos and instructions if you can along with where to purchase everything.
I know it often takes more time to document than to do the install, so thanks in advance if you can find the time to do so.
DaBull

John,

Below are the parts I used. Parts sourced from McMaster-Carr. I use the straight connector at the diff, because as K1LL3M noted, there is not a lot of room to get a wrench in to tighten the elbow connector. In addition, the direction the elbow sent the tubing was not ideal. The rear breather tube was routed along the suspension arm to the LH sill. From there it basically follows the wire harness up to the LHD footwell. Here I routed it above the frame and below the body, following the firewall up and behind the black-capped coolant reservoir. Front breather tube is sort of the mirror image - leave diff, travel along suspension arm, then a gentle loop to meet the rear tubing and follow the same path above frame, below body, up firewall. The dual 90-deg. fitting with breather vent sits just inboard of the black coolant cap. I will try and get some photos this week. I finished the install late Sunday night and it's been raining ever since.

1pc. P/N 5225K939 - Push to Connect Double 90 Deg Fitting, for 6mm tube, OD 1/8 BSPP Male
2pc. P/N 2333N215 - Nickle Plated Brass PTC for 6mm tube, M10x1mm male
1pc. P/N 9833K24 - Breather Vent Zinc plates steel, 1/8 NPSM Female
25ft. P/N 50405K75 - Hard Nylon Plastic tubing, Gray, 4mm ID 6mm OD

anand · Mar 6, 2024

Tom109 first off, thank you for the leg work, and most importantly, part numbers!!

This seems to be a bad habit of mine, but again, I haven't read all 14 pages of this thread in depth to see if someone else already said what I'm thinking... I'm making an assumption that the tubing you've mentioned is of compatible hardness/etc to others on the market, and as an informational/theoretical post, the ARB diff breather kit uses 8mm OD tubing; so, in theory, one could purchase the ARB kit, as well as Qty 2 of the McMaster 2333N216 (M10x1 male to 8mm PTC), and make a hybrid of DIY and the ARB

Tom109 · Mar 6, 2024

anand said:
Tom109 first off, thank you for the leg work, and most importantly, part numbers!!

This seems to be a bad habit of mine, but again, I haven't read all 14 pages of this thread in depth to see if someone else already said what I'm thinking... I'm making an assumption that the tubing you've mentioned is of compatible hardness/etc to others on the market, and as an informational/theoretical post, the ARB diff breather kit uses 8mm OD tubing; so, in theory, one could purchase the ARB kit, as well as Qty 2 of the McMaster 2333N216 (M10x1 male to 8mm PTC), and make a hybrid of DIY and the ARB

Yes, tubing hardness is a range and should be matched to the chosen PTC connectors. Everything I bought cost me $110, less the 2x elbows @$20/each, bringing my kit down to $70 delivered in 1-day.

The 8mm/6mm OD is a non-issue. Coil-sprung LR’s used 6mm diff breather tubing and only had a 180deg formed bend at the firewall end. No filter or anything. RRC EAS was run on 6mm tubing as well. Both systems worked and I have a lot of 6mm spares.

[ Adam ] · Mar 6, 2024

Tom109 said:
John,

Below are the parts I used. Parts sourced from McMaster-Carr. I use the straight connector at the diff, because as K1LL3M noted, there is not a lot of room to get a wrench in to tighten the elbow connector. In addition, the direction the elbow sent the tubing was not ideal. The rear breather tube was routed along the suspension arm to the LH sill. From there it basically follows the wire harness up to the LHD footwell. Here I routed it above the frame and below the body, following the firewall up and behind the black-capped coolant reservoir. Front breather tube is sort of the mirror image - leave diff, travel along suspension arm, then a gentle loop to meet the rear tubing and follow the same path above frame, below body, up firewall. The dual 90-deg. fitting with breather vent sits just inboard of the black coolant cap. I will try and get some photos this week. I finished the install late Sunday night and it's been raining ever since.

1pc. P/N 5225K939 - Push to Connect Double 90 Deg Fitting, for 6mm tube, OD 1/8 BSPP Male
2pc. P/N 2333N215 - Nickle Plated Brass PTC for 6mm tube, M10x1mm male
1pc. P/N 9833K24 - Breather Vent Zinc plates steel, 1/8 NPSM Female
25ft. P/N 50405K75 - Hard Nylon Plastic tubing, Gray, 4mm ID 6mm OD

View attachment 7846972

Is this quantity per diff?

I appreciate any excuse to use the McMaster-Carr website. Hands down one of the best in the industry.

Tom109 · Mar 6, 2024

[ Adam ] said:
Is this quantity per diff?

I appreciate any excuse to use the McMaster-Carr website. Hands down one of the best in the industry.

View attachment 7846995

That order would do front and rear, leaving several feet of extra tubing.

anand · Mar 6, 2024

Tom109 said:
The 8mm/6mm OD is a non-issue.

My thoughts with the ARB are purely vanity

I like the way the ARB breather itself looks hahaha

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