Murena high fifth gear

Oetker · July 18, 2009, 10:12:39 AM

Ok, very clear to me.
This wil be on the to do list if I can find the right gearbox.
Thanks for sharing this info.

Oetker · July 22, 2009, 01:39:23 PM

I found the gears, but only the gears.
31 and 46 tooth.
Is this enough to do the mod?

suffolkpete · July 22, 2009, 07:31:44 PM

Come on, keep up at the back there

I refer you to Roy's original post.

QuoteHowever, it was not just a straight swap of fifth gear pairs, which could have been really easy and cheap. The two Citroën cars mentioned above, obviously had problems with the original end case bearings and gears, and so they redesigned it and provided a kit for the dealers to repair the gearboxes when they were under warranty. It is this kit that I used to buy, to uprate the Murena. It consists of new bigger end case bearings and retaining plate, new spacers and bushes, new fifth gear pair, a new synchromesh unit and two shaft nuts.

Oetker · July 22, 2009, 07:51:26 PM

If you look at my pics, there is a difference compared to the gears of Michael.
I think I have a pair of the Turbo type 1 (early models) and maybe no modification of the fork is needed.
Don't forget technical enghlish is also difficult for a foreigner.
You read the words but not all hits the brain.
What I am curious about, if Michael used all parts of what he bought.
I can buy the 2 gears but the rest of the things is the question.

michaltalbot · July 22, 2009, 08:17:16 PM

I used these two gears + CX synchro wheel, in the end the fork was used the original one, but modified. I think that it's necessary, because the bigger CX wheel (46 teeth) is bigger than original one.

Oetker · July 22, 2009, 08:22:12 PM

Thanks for the info.
To make it clear, I only need the the synchrowheel with this gears to complete the task.
It wil be my first gearbox job

, so sorry to be a bit of a noob in this case.

Oetker · July 23, 2009, 12:28:38 PM

Some additional info, for people looking for this sets.
It seems there are 2 types of CX2500 GTI turbo.
Type 1 has the gears on my pics.
Aldo the toothcount is 31-46, they have a different diameter ,and wil not fit the Murena gearbox.
Type 2 has the gears in Michaels pics.
This is what is needed.
I found a compleet set for €150.- and go for the badge

JV · July 23, 2009, 02:02:36 PM

That is a complication.
How do you know you have the good type 2 gearbox?

Jan

Oetker · July 23, 2009, 02:06:21 PM

Ask for CX2500 GTI Turbo2.
If youre interested Jan, I maybe have found a second set.
I pulled all the strings I could find, and have now several reactions.

JV · July 23, 2009, 08:12:42 PM

Quote from: Oetker on July 23, 2009, 02:06:21 PM
Ask for CX2500 GTI Turbo2.
If youre interested Jan, I maybe have found a second set.
I pulled all the strings I could find, and have now several reactions.

Yes, I am interested.

Jan

Oetker · July 23, 2009, 08:31:27 PM

Quote
Yes, I am interested.

Jan

I wil PM you if I have things sorted out.
Wil be somewhere around next week, because I have to collect the set I bought, and see what I got.

Oetker · July 25, 2009, 01:25:25 PM

First set is collected.

This Citroen guy wil inform me for more kits if he can put his hand on it.
Second set wil be collected in the coming week.

roy4matra · July 25, 2009, 04:40:40 PM

Quote from: Oetker on July 22, 2009, 07:51:26 PM
If you look at my pics, there is a difference compared to the gears of Michael.
I think I have a pair of the Turbo type 1 (early models) and maybe no modification of the fork is needed.

No, a modification to the selector fork will always be needed, since the 46 tooth gear is approx. 2 mm larger diameter than the original 45 tooth gear.

After seeing Micheal's picture of the two forks - it reminded me why the Citroën one doesn't fit and you need to modify the Murena one. The bolt hole and boss are in the wrong place on the Citroën fork. The Murena end casing is less deep and so there is less space inside, so the Murena fork has the end angled off and is mounted on the shaft in a different position to fit inside the smaller end case.

As for whether the early (type 1) Citroën gears will fit - I'm not sure, since I have never had any to measure accurately. It is possible, but you would need to check not only the diameters, but the centre holes where they fit on the shafts, the width or thickness of the gears and the centre bosses, and the relationship to the other parts when fitted. With the kits I obtained, since the bearings were bigger all the dimensions had to alter, and you were provided with new bushes, collars and spacers so that the new gears would line up correctly.

So please bear in mind that if you are taking parts from a Citroën box, you may need these bushes, collars or spacers as well as the gears. The fork you won't want.

Roy

Oetker · July 26, 2009, 06:41:01 AM

Quote from: roy4matra on July 25, 2009, 04:40:40 PM
As for whether the early (type 1) Citroën gears will fit - I'm not sure, since I have never had any to measure accurately.
Roy

The Citroen garage where I ordered a set told me there was a difference in diameter.
I have to see for myself as I collect this set.
They opened a Turbo II box specialy for me.
I will compare myself when I am there to collect.

Matra_Hans · July 26, 2009, 04:42:37 PM

Hi
Have just opened my CX turbo diesel gearbox and inside it I found the gear wheels that I was looking for 46 & 31.
Information form Globalcar´s datasheet regarding the gearing of the various Citroën models made me a little nervous, and I have been thinking that may be I had wasted 380 Euro for the box.

As I am working abroad I purchased the gearbox over the Internet and asked my wife to collect it. I came home on holiday yesterday, but could not find a chance to go to the workshop until to day.

Hans