Reasons to not do ADM

TacoJeff19 · Nov 18, 2019

Anybody decide not to remove their clutch fluid accumulator? I purchased one of the available kits of TW and planned to install, but I have been learning about hydraulic systems in some engineering classes I am taking currently.

Some state that Toyota placed the accumulator in the clutch system to reduce wear and to make the manual transmission easier for beginners to learn on.

A misconception I had about the accumulator was that it kept the speed of engagement constant no matter the speed of clutch pedal travel.

The general function(s) of a hydraulic accumulator is:

As a "storage tank" for high pressure hydraulic systems

storage of pressure in case the "pump" or in our case master cylinder cannot supply enough pressure to operate the slave cylinder for full travel of the pressure plate spring.

Accumulators also serve to filter out pulsations in the pressure (this results in constant pressure, which is good).

So in conclusion the accumulator does not hinder flow of fluid, it simply keeps the pressure constant for complete actuation of the clutch.

So after learning this information I am reluctant to delete the accumulator.

Any opinions? Thoughts?

0xDEADBEEF · Nov 18, 2019

If engagement speed is a function of pressure, and pressure is being held constant, then doesn't that make the "misconception" truth?

fatboyfirebass · Nov 18, 2019

TacoJeff19[OP] initial post: ↑

Anybody decide not to remove their clutch fluid accumulator? I purchased one of the available kits of TW and planned to install, but I have been learning about hydraulic systems in some engineering classes I am taking currently.

Some state that Toyota placed the accumulator in the clutch system to reduce wear and to make the manual transmission easier for beginners to learn on.

A misconception I had about the accumulator was that it kept the speed of engagement constant no matter the speed of clutch pedal travel.

The general function(s) of a hydraulic accumulator is:

As a "storage tank" for high pressure hydraulic systems

storage of pressure in case the "pump" or in our case master cylinder cannot supply enough pressure to operate the slave cylinder for full travel of the pressure plate spring.

Accumulators also serve to filter out pulsations in the pressure (this results in constant pressure, which is good).

So in conclusion the accumulator does not hinder flow of fluid, it simply keeps the pressure constant for complete actuation of the clutch.

So after learning this information I am reluctant to delete the accumulator.

Any opinions? Thoughts?
Click to expand...

After I removed mine. I took a look inside. I know its called an accumulator, and there is a space that could by definition be called a reservoir in there. But, in my opinion the whole contraption is more of fixed orifice flow restrictor.

TacoJeff19 · Nov 18, 2019

0xDEADBEEF said: ↑

If engagement speed is a function of pressure, and pressure is being held constant, then doesn't that make the "misconception" truth?
Click to expand...

I see what you're saying and you could be correct, I believe In a regular accumulator pressure is maintained at "x" amount regardless of "speed". But if what @fatboyfirebass said is true then it might not fall under accumulator and really be more of a flow restrictor.

TacoJeff19 · Nov 18, 2019

Does anybody have any pictures of an accumulator and insides?

Shellshock · Nov 18, 2019

TacoJeff19[OP] said: ↑

Does anybody have any pictures of an accumulator and insides?
Click to expand...

there’s some in the ADM thread

fatboyfirebass · Nov 18, 2019

TacoJeff19[OP] said: ↑

Does anybody have any pictures of an accumulator and insides?
Click to expand...

Here are some pictures that show it in various states of dis-assembly

tonered said: ↑

Hey, Folks.

Table of Contents

1. What is the Accumulator
2. Plug and Play Delete Kit
3. Flare Explanation
4. @sherwoods_Fleet Installation Instructions
5. Delete Options:
6. Prefabbed / Salvaged Hard Line Mod
7. Flex Line Mod
8. Hack Your Accumulator Mod
9. Brake Line Elbow Mod
10. Installation Details
11. PoS Accumulator Pics
12. 2.7l Clutch Line Diagram
13. @TeecoTaco Needs Ti for Christmas

1. What is the Accumulator

A lot of MT cars / trucks come with some type of accumulator that messes with the clutch feel and engagement. This is said to help newbs learn to drive an MT and reduce shock and wear on the driveline. For anyone that knows how to drive an MT will laugh at this. The last thing anyone needs is system that doesn't follow your commands, is slow, and is inconsistent.

Removing the accumulator will add some feel to the clutch, speed engagement when you want to, and allow you to modulate the clutch effectively when you need it, such as when downshifting to 1st while moving.

If you want more feel, faster / direct engagement, and less wear, the ADM is for you.

2. Plug and Play Delete Kit!

@Trident904 is fabbing formed hard lines including the coupler for this delete:

https://www.tacomaworld.com/threads/clutch-accumulator-delete-kit.583387/

3. Flare Explanation

Very good info on our flare type:
https://www.tacomaworld.com/threads/what-does-a-clutch-fluid-accumulator-do.180006/page-2#post-19751480
Credit: @DaveInDenver

4. @sherwoods_Fleet Installation Instructions

Sorry for splitting up the installation details, but @sherwoods_Fleet 's instruction are too nice to bury further down. Of courses the PDF is attached at the bottom of this post. I know how to link it right here.

5. Clutch Accumulator Delete Options:

6. 12in Prefab / Salvaged Hard Line and Coupler from autoparts stores / online:

This is arguably the easiest method, using either scrap brake line or a 12in prefab line (3/16in double flare with M10x1.0 fittings, and an M10x1.0 coupler).

There are some reports of leaking using the prefab lines. The reason is attributed to the type of flare fittings:

Toyota Sleeved Fittings:

Prefab Line Fittings:

It is felt that the unthreaded portion of the Toyota fittings helps with getting a good seal a the slave cylinder.

Here are the parts that @Trident904 used:

You need to form these bends:

Credit: @fatboyfirebass
https://www.tacomaworld.com/threads/mt-accumulator-delete-and-bs-thread.568303/page-18#post-19311770

Credit: @Vitalzone
https://www.tacomaworld.com/threads/mt-accumulator-delete-and-bs-thread.568303/page-14#post-18976661

Credit: @TD90S
https://www.tacomaworld.com/threads/mt-accumulator-delete-and-bs-thread.568303/page-11#post-18959455

7. Flex Line Mod with a banjo at the slave:

Credit: @J-pp
https://www.tacomaworld.com/threads/mt-accumulator-delete-and-bs-thread.568303/page-19#post-19492004

Parts:

$35 HNCL-20 Techna-Fit Stainless Steel Clutch Line Kit for 2000-2003 HONDA S2000 - HNCL-20

HNCL-20:

$35 Techna-Fit Stainless Steel Clutch Line Kit for 2000-2003 HONDA S2000 - HNCL-20

https://www.amazon.com/Techna-Fit-Stainless-Steel-Clutch-Honda/dp/B00AQ2ODS2 (this doesn't look like @J-pp 's line?)
Banjo Fitting
Banjo Bolt
Crush Washers
P-Clamp with Rubber Sleeving

8. Hack Your Accumulator:

Credit: @kgautier
https://www.tacomaworld.com/threads/2016-ovtune-tacoma-3-5l-manual-transmission-engine-ecu-reflash.515734/page-425#post-19553388

9. Brake Line Elbow Mod

This is the route that @RedBeard1 and I went. Thanks, @RedBeard1 for confirming that this should work.

I safety wired mine, while @RedBeard1 welded his to the original mounting plate:

My plan was to use some heat to twist the bracket 90deg for mounting. Edit: don't use heat. It isn't needed.

Mods to the elbow:

Original Part:

Flattened the mount bracket as much as possible without a vice:

The mounting hole didn't align well.

I thought a twist might help:

Nope! Other than giving a nice perch for the safety wire.

Final setup (the top side is to the right):

I had to cut off the bracket that extended past the plate so that it would fit on the transmission.

10. Installation details:

I clamped off the inlet line just in front of the firewall.

I highly recommend removing the exhaust support. It is just 3 14mm bolts, makes dealing with the shield much easier, and allows the use of a straight 10mm line wrench. HF, FTW! My 12pt articulating 10mm was hosed up and almost rounded off the nipple. The HF ones are 6pt.

3 12mm to remove the accumulator from the transmission. I removed the accumulator (4 10mm) and reused the mounting plate.

Safety wire!

I bent the slave line up then back to flex it in to place. I then used various tools to gently flex the slave line away from the mount bolt and transmission.

Note: Get both nipples started by hand as far in as you can before tightening with a wrench or flexing the lines around for final alignment. You really don't want to cross thread anything here.

Bleeding was a piece of cake. It seems that the only air in the system was near the slave. Bubbles didn't seem to travel up as the supply continued to trickle?

Driving, there is a bit more feel. I will post up once I get more miles.

11. Adding accumulator pics:

The circular wire is not a clip. It is a spacer to add preload to the plate and seal.

12. 2.7l Clutch Line Diagram

Here it is:

From toyota.com

These are all the lines from the firewall to the slave cylinder. It looks like a very different routing. I do not think that Part Numbers 31482 or 31482A would be of any help with the ADM.

13. Hey, @7r41lbr34k3r .

@TeecoTaco thinks that his life isn't complete without some shiny new Ti Radio Knobs. For him, just one of your knobs is not enough. He needs all the knobs.
Click to expand...

hiPSI · Nov 18, 2019

TacoJeff19[OP] said: ↑

Does anybody have any pictures of an accumulator and insides?
Click to expand...

Please look at my screen name and pm me lol.

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Reasons to not do ADM

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TacoJeff19 [OP] Well-Known Member

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0xDEADBEEF Swaying to the Symphony of Destruction

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Shellshock King Shit of Turd Island

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hiPSI Laminar Flow

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