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JB74 auto breathers.

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10 Oct 2021 00:02 #239261 by uncleroberto
I've read through all the information I can find regarding extending the diff breathers. 
I've managed to do both diffs and the tight transfer case breather. 
Now all the info regarding the gearbox breather refers to the manual which is super accessible in the engine bay.
Does the auto just not have one?

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10 Oct 2021 02:06 #239262 by zukebob
Replied by zukebob on topic JB74 auto breathers.
The TW40 in the Gen 3 is a sealed transmission. I believe it's the same auto in the Gen 4

I started out with nothing & still have most of it left

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05 Feb 2022 23:25 #241713 by PabloAzH
Replied by PabloAzH on topic JB74 auto breathers.
Sorry to bring this topic back, but I'm about to extend breathers in my JB74 as well... has anyone confirmed that the auto JB74 does not have a gearbox breather?? Only 3 breathers to extend?

Also, has anyone moved the breathers further up than the engine bay, through the snorkel?

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06 Feb 2022 01:20 #241715 by zukebob
Replied by zukebob on topic JB74 auto breathers.
My previous reply was based on a relatively longstanding "truth" from another forum. I have since come across additional pictures of a Gen3 auto (TW40) showing a breather at the rear of the transmission. I still believe it is the same transmission on the Gen4. Attached are the pictures.

 

I apologize for the earlier misinformation.

I started out with nothing & still have most of it left
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06 Feb 2022 06:39 #241717 by Lambert
Replied by Lambert on topic JB74 auto breathers.
So what you are saying there is that the late gen3 auto box will cope with a small increase in power and a simultaneous small increase in tyre size?

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.

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06 Feb 2022 11:42 #241720 by Roger Fairclough
I would be very surprised if the auto did not have some sort of breather as although ATF is not supposed to froth, there will be an increase in air pressure due to heat and that needs to be dealt with. The picture shows a feature that looks like a breather and is where I would expect a breather to be, so maybe!!!

As to where to exit the breather, I took mine high up in the engine compartment and capped it with a small motorcycle fuel filter.

Roger

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08 Feb 2022 01:43 - 08 Feb 2022 01:43 #241744 by PabloAzH
Replied by PabloAzH on topic JB74 auto breathers.
I had the opportunity to check under the Jimny when it was on a lift for regular maintenance at the dealer but I couldn't find the gearbox breather anywhere I could look or reach.
I checked again today, this time looking at the engine bay for an extension, but found nothing. The gearbox does look a lot like the one in zukebob's picture, but also there you can't see the breather clearly... I could from the engine bay see the lever on the right side and the pair of tubes that seem to take the gearbox oil through a cooler all the way up in the front, as well as the oil dipstick tube, but no breather.

Has anyone succeeded in the search for this breather or would be willing to investigate it?
Last edit: 08 Feb 2022 01:43 by PabloAzH.

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08 Feb 2022 06:08 #241747 by zukebob
Replied by zukebob on topic JB74 auto breathers.
Just to clarify the previous photos:

 
 

I started out with nothing & still have most of it left
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08 Feb 2022 12:23 #241756 by mlines
Replied by mlines on topic JB74 auto breathers.
The JB74 AT transmission has the standard Suzuki small pop up breather cap at the top rear of the transmission case.

Part 14 in the picture

 

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
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12 Feb 2022 13:51 - 12 Feb 2022 13:52 #241822 by PabloAzH
Replied by PabloAzH on topic JB74 auto breathers.
Thank you very much Martin and zukebob! Sorry I couldn't log in earlier.

So 4 breathers to extend, I have got the ARB breather kit and I will purchase a thicker hose and adapters to connect to the components. Thus far I have measured the front/rear diff breathers, about 14mm in diameter. I'm also thinking about joining the 4 hoses into one under the bonnet and to bring it all the way up to the snorkel, where I would place the breather filter - if I get the Brazilian snorkel I might place the breather filter as far on the top as possible to protect from any splash of water that could hit the snorkel inlet screen and to prevent obstruction to the air flow.

I was wondering if placing the breather filter inside the snorkel could cause some trouble by the engine intake air flow creating low pressure on it that could suck the the oil from the diffs/gearbox/transfer case or prevent the correct functioning of the breathers, but maybe I'm just worrying too much about it...
Last edit: 12 Feb 2022 13:52 by PabloAzH.

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