Author Topic: CVT Fluid complete flush 2007 Jazz / Fit GD  (Read 2898 times)

innuendo1231

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CVT Fluid complete flush 2007 Jazz / Fit GD
« on: May 22, 2022, 11:14:14 PM »
Hey everyone. So I decided to do a complete flush of the CVT ATF in my 2007. Previously I've been using Honda ATF-DW1, but i've been getting mixed input on whether that is okay or not. Some sources said ATF-DW1 is recommended for this model, but others said that ATF-DW1 is not a cvt oil and should not be used. Anyway, Honda CVT-F is discontinued too, so I decided to buy 2x4 litres of Eneos CVT fluid.
I wanted to remove as much as possible so that the two kinds of oil don't mix.
This is a CVT equipped 2007 EU model, so the steering wheel is on the left, I'm not sure if the gearbox location would be any diffenet on a right hand wheel model.

There was no guide, no pics or videos of the procedure for this particular car, so I decided to document what I find. As you will see in the pic, I unplugged both cooler hoses to find out which one is the outlet, but you only need to unplug one.
The procedure needs two people.

I've done this from under the car, the hoses are are down at the very bottom so I think this is the only way to go. There is a black plastic cover that needs to be taken off. It is held by two screws and some plastic clips. The plastic cover has some vertical parts going up at the sides (beside the wheels), there are two clips on each side up there, those are a bit tricky to see, I found a little mirror helpful. There are also a few more obvious ones.
Once you got the cover off you will see the hoses that come from the gearbox and plug into the ATF cooling radiator.
But before you disconnect those, the first thing to do is a regular drain and fill. Take the gearbox dipstick out, loosen the bolt (this was the most troublesome part, it took a long makeshit lever). After it's drained, refill the appropriate amount with new CVT oil. According to the service manual it's 3.2 L. Worked out well for me. It's worth mentioning the the washer is supposed to be replaced with every drain. If not a genuine Honda, then a generic soft-metal washer should do, inside diameter 18mm, outside is 25,5. I used a bronze-ish copper one.
Now comes the fun part. Disconnect the ATF radiator outlet hose. It has to be the outlet, otherwise the oil in the radiator would remain unflushed. I used two idenctical glass jars for measure (must be clean and dry!), and put a short clear vinyl tube on the radiator outlet (the metal part that the hose was taken off) to guide the oil into one of the jars.
And this is why it needs two people. Someone has to start the engine and operate the shifter, while the other one watches how the jar is filling. The engine should only run for a few seconds like this.
I filled a regular 0,5 L jar almost full before shutting off each time. I also found that only small amount of oil came out in neutral, and then it just stopped coming. Shifting to R didn't pump it out either. Shifting to D got the flow going, so that's what needs to be used (of coure you need to shift to P to shut off).
So a jar of the old oil comes out. You put the other jar beside it and fill it with new oil to the same level, and pour it in the dipstick hole. You get the idea.
I repeated this until only 0,5 L was left of the new oil, for the final level correction.
I put everything back together and checked the oil levels with the dipstick. It only needed a little bit more. Went for a little drive, came home, checked the level, right in the middle of the hot markings.
So that's it.

You might ask if I felt a change after all this. Well, fortunately I didn't have any particular problems before, so no dramatic changes. It got a bit quiter. Previously, there was a little... chirping, noticable when enaging D after N. It's not as audible now. I guess for some jazz's with starting clutch problems this procedure could make a world of difference.
« Last Edit: May 22, 2022, 11:19:16 PM by innuendo1231 »

innuendo1231

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Re: CVT Fluid complete flush 2007 Jazz / Fit GD
« Reply #1 on: May 22, 2022, 11:28:42 PM »
By the way, the clips look like this, in case you'd want to get some before disassembling. Mine was missing quite a few already, and the remain ones weren't in good condition either.

innuendo1231

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Re: CVT Fluid complete flush 2007 Jazz / Fit GD
« Reply #2 on: May 23, 2022, 12:27:39 PM »
I realized that only registered memebers can see the images. Is it allowed to use links here?

https://www.dropbox.com/s/xh8ui1nz6i9uu1e/flush.jpg

https://www.dropbox.com/s/8g8z75c30lsk7bd/patent.jpg
« Last Edit: May 29, 2022, 11:10:04 AM by RichardA »

RichardA

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Re: CVT Fluid complete flush 2007 Jazz / Fit GD
« Reply #3 on: May 29, 2022, 11:11:41 AM »
I realized that only registered memebers can see the images. Is it allowed to use links here?

https://www.dropbox.com/s/xh8ui1nz6i9uu1e/flush.jpg

https://www.dropbox.com/s/8g8z75c30lsk7bd/patent.jpg

Yes.

I've tried adding img tags to your links so they show up in the post...

Code: [Select]
[img][/img]

...but that didn't appear to work.

FBogdan

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Re: CVT Fluid complete flush 2007 Jazz / Fit GD
« Reply #4 on: June 04, 2023, 12:16:13 AM »
Hi!
Here's another trick which improves a lot the CVT juddering.
Consider doing this only if your CVT fluid is recently changed and the juddering is still there.

Situation: I bought a Jazz CVT for town traffic purpose mainly. It came with a lot of small issues, but the acquisition price was good, and I accepted the challenge to fix it.
Of course, the CVT juddering was present.
Changed the CVT fluid with brand new Honda CVT-F oil and the juddering was diminished but not disappeared entirely.
After 500 Euro investment in other parts, I was starting to wonder if another 100 Euro in another fresh oil is suitable at this point, so I took on to logic, physics and chemistry to explain why and how this juddering happens.
As some of us know, the full fill of the CVT gearbox is 5.7 liters, but on service interval we need approximately 3.4-3.6 liters, so what's happening with the rest of 2.2 liters? According to physics, gravitational attraction will tend to keep the existing oil down in the different rooms inside the gearbox, so a double flush with brand new oil is indeed recommended. But what if, I can flush, filter and refill with the same oil used only for 500-600 km?
So, I took my tools, and did it and the result is a big improvement, the juddering has now decreased a lot (specific, in my case I was having 2 juddering intervals, 1st from a stand still start and 2nd when reaching ~2000 rpms. After my DIY flush, I have only the 1st juddering at a much lower intensity).
Steps for the process (assuming you all know how to change the CVT oil, if not, go to youtube and see the tutorials):
1. Search and buy or use from home a very fine and clean filter material, with very tiny gaps between bands of the filter (you can use a pair of woman tights applied in 2 or 4). I've used both (woman tights and a purchased filter).
2. Prepare 2X a clean (or brand new) empty recipient to collect the used oil and to get the oil filtered. Minimum 4 liters capacity for a good manipulation when full.
3. Try to ensure a clean environment when you do this job....as much as possible (avoid dust, particles, water or any other debris which can contaminate the oil).
4. First clean the mess around the oil cap (brake spray, soap and water, alcohol, etc.), just make sure is completely dried before proceeding next.
5. Open the CVT oil bolt and carefully retrieve the used oil in the 1st recipient.
6. Use a clean funnel on which you apply since the beginning the filter (I've used a fuel funnel which has a filter inside and I added extra my "performance" filter homemade or bought).
7. Pour slowly and carefully the used CVT oil from the 1st recipient to the 2nd one through the improvised filter. When almost finished, pay attention at the last 50-100 ml of oil, if you see debris in it, my suggestion is to accept this minimum loss and recycle it.
8. Clean the oil magnetic bolt (use brake cleaner spray is my suggestion and leave it for 1-2 minutes to get dry). Put back the magnetic bolt and tight with medium strength (1 quarter after free tightening becomes hard with the wrench).
9. Pour back into the gearbox the filtered oil from the 2nd recipient.
10. Start the engine, press the brake and switch through every gear available (P R N D S L) and allow 5-6 seconds functioning in each of them. I think a better option is to drive for few km the car, but if you are in a hurry, switching through gears will be enough.
11. Repeat the whole process starting step 5.

You will notice at the first flush metallic debris on the magnetic bolt and also some non-metallic debris at the bottom of the 1st recipient (last drops of used oil from the 1st recipient). Also, you will see some non-metallic debris on your improvised filter. I had only 500-600 km since the CVT fluid change.
At the second flush, you will see only non-metallic debris on filter and at the bottom of the recipient, but you can clean also the bolt.
I hope this saves 100 Euro from your wallet, but you should always change the CVT fluid with brand new one (only Honda CVT-F) at maximum 40K km. From my experience with this, the new oil lasts around 3 years or max 40K km before the juddering will re-appear. I think it depends much of the climate area and usage type.
Succes!

guest9236

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Re: CVT Fluid complete flush 2007 Jazz / Fit GD
« Reply #5 on: June 06, 2023, 12:27:38 PM »
Thank you
very interesting  further info perhaps later will also be interesting.

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