How to change Nitrogen Accumulator Cannister - Attesa

[Deza3000]

Hi All,

Thought i'd post an official translated guide from Nissan on how to remove a Nitrogen Accumulator Cannister. A friend was kind enough to translate the official Japanese doco for me with no ambiguity. I've seen a few videos and articles of people spending days trying to remove it... We spent 10 minutes... Didnt even have to remove the Attesa assembly from the car.. All we used was an oil filter removal tool.

Common mistake is people dont depressurise the Canister before removal resulting it to be almost impossible to remove - similar to a air tight jar of pickles. 

1. Depressurising the hydraulic unit

Must take pressure off from the hydraulic unit before removing the unit from a car body - Can be done by loosening front part of cannister (before the Hex bolt)
(Refer to service technical information no. 1891 for more detailed instructions)

2. Removal of the hydraulic unit assembly from the car body
Refer to the car service manual for the instructions.

3. Removal of the accumulator from the hydraulic unit
Loosen the accumulator using a pipe wrench while holding the thread part with rags to prevent oil spillage. Undo slow by hands ensuring the accumulator unit is facing downwards so that no debris would fall into the assembly unit.

4. Threads preparation before installation
Clean thoroughly to remove all excess glues left on the threads.

5. Installation of the accumulator unit
Apply 1.5-2.0 threads length of thread locker (three-bond 1324 equivalent) to centre position of the threads on the accumulator.
Apply "Nissan power steering fluid special" all over the O-ring.
Fit the accumulator unit into the hydraulic unit by hand with full strength then tighten using a pipe wrench holding a head section of the unit with set torque of
39-41 Nm. (As reference it is equivalent to 8 degrees or 5mm on circumference.
Refer to the diagram below)
 

From top (Apply "three bond 1324" / Head
section / O-ring)
NB: If you scratch the surface of the unit, re-paint with anti-rust spray.
 

6. Disposal of the accumulator unit
Follow the label instruction for proper disposal of the unit.

 

 

 

Edited March 26, 2024 by Deza3000

[Duncan]

Thanks, that is a really valuable post, I've moved the thread to the DIY section and added it to the DIY threads index

I take it skipped step 2 and just loosened and removed it with the oil filter wrench?

[Deza3000]

No worries! Cheers.

Yep I skipped step 2 and just loosed with the oil filter wrench, wasn't too keen on disconnecting the high pressure lines. I did loosen the brackets from the mount and had it dangling so i had a bit of clearance.