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I have a 2002 307sw 1.6 Petrol that has been jumping out of 5th gear for a few days but now lost 5th gear altogether. I have read that a nut will have come loose on the shaft but it can be fixed in situ by taking the end plate off to access it.
I could really do with some good advice on how to proceed.
The car drives well in all other gears but mpg really suffering.
 

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I have a 2002 307sw 1.6 Petrol that has been jumping out of 5th gear for a few days but now lost 5th gear altogether. I have read that a nut will have come loose on the shaft but it can be fixed in situ by taking the end plate off to access it.
I could really do with some good advice on how to proceed.
The car drives well in all other gears but mpg really suffering.
Your Nut is probably the cause of this indeed. Repair is fairly simple. If you have a hoist, that is great as you dont have to work in the ground. But you can do it on the ground as well. Lift up the left side pretty high, this make the oil go into the transmission and you dont have to take of the oil.

Now take of the wheel and make sure you have clear access to the cover.
This cover has 3x 13mm bolts in there. Take them out and take of the cover. The left shaft is your primary one and the gear will be fixed with a springloaded clip. The right shaft is your secundairy shaft that is shifted.. This one has a Nut on there(27 or 32mm). In order to fixate it again, you have to make sure your synchro ring nodges are aligned with the selector hub. You will see the whole ring if its not in there, when its aligned good, it will almost dissapear in the selector hub.
WHen you have the ring in there, push it towards the gear and then tighten the nut. Would advice to put some locktide on it and use a proper tool to lock it on the shaft. After you've done that, check the axial play on the secundairy shaft. This should be somewhere around 0.3mm. If its to tight, you have something worn, or your synchro ring isnt sitting right. If its okay, check if you can freely rotate the secundairy shaft while the transmission is in neutral. If it works, put it in 5th gear and see if the collar sits good agains the gear. If that looks good, assemble it and drive it.
Any questions, just ask.
 
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