You have difficulties to engage the 4th gear hot and it cracks on your Renault Scenic and you wonder what the problem is? So you would like to have more details on this problem to be able to know what to do et and what will be the price of the repairs. This is the reason why in this article we will explain everything you need to know. First we will tell you why the 4th crack on your Renault Scenic. And then we will give you advices for fix your problem gearbox that cracks, especially the average price of repairs.
Why is the 4th crack on my Renault Scenic?
When a particular gear turns out to be difficult to pass, it is often linked to a problem with sync or linkage. In order to understand what the problems could be with your gearbox, we will first start by briefly explaining the gearbox operation et
the role of synchros and linkage in a Renault Scenic gearbox.
Operation of the gearbox on Renault Scenic:
A gearbox is intended to boost the speed of the engine so that you have the ability to pick up speed. In fact, the engine of your Renault Scenic will run at an average speed depending on its power, but this will be limited. So in the same way as on a bicycle, the gearbox will be composed of pinions larger or smaller for increase speed wheels. These gables are found on transmission shafts which are associated with the engine via the clutch. So when you want to shift into gear, you're going to have to shift into gear. This will allow separate the flywheel from the clutch disc so that the engine speed is no longer transmitted to the transmission shaft. This desynchronization of the systems will make it possible to change the speed.
What is the role of the linkage on the gearbox of my Renault Scenic?
The linkage allows change gear speed remotely from the gear lever. Indeed this is connected to the gear lever. It is located above the drive shafts and is composed of a fork for all speed couples, ie a fork which controls the 1st and 2nd, another concerning the 3rd and 4th ... The forks will allow to push the player which surrounds the synchro ring towards the idler gear speed selected to be able to engage it. When the gear is engaged the output shaft will make circular motions at the gear speed of the gear engaged.
More concretely, when the driver engages the first for example, then the linkage will push the synchro ring towards the idle gear of the first gear which has a larger diameter than the others to reduce the amplification effect of speed. Consequently the output shaft will make circular movements at the rate of the first gear pinion.
The role of the synchronizer on the gearbox of a Renault Scenic:
In order to give the possibility to the linkage of make the idler gear coincide with the transmission shaft un sync ring will be installed for each speed. So the synchronization system is made up of an idler gear, a walkman, a synchro ring et of a hub.
The hub will be installed on the drive shaft which transfers speed to the wheels. The player will be attached to the linkage fork, so it will push the synchro ring on the idler gear clutch body. In this way the 2 components will rub together to be able to take the same circulation rhythm and then fit together and activate the speed.
Speed problem creaking on my Renault Scenic:
Now you know how the gearbox, the linkage and the synchro work, it will be easier explain the problems associated with creaky speed. On the other hand, if all the speeds are hooked, we recommend that you read the following article if you want more details: The gearbox of my Renault Scenic hangs.
Speed creaking on Renault Scenic: Linkage concern:
If there is a linkage problem on your Renault Scenic, in this case you should feel a flutter on the gear lever. In the same way it sometimes happens that in addition to the crackle you have jumping speed and returns to neutral.
When the problem arises from this, it will be possible to fix your problem without disassembling the gearbox so that is good news. It will therefore be necessary to analyze whether there is a clearance at the level of the rods and fixings and why not a deformed ball joint.
Speed creaking on Renault Scenic: Sync problem:
It is possible that the gear of the synchro ring is polished and prevents good speed engagement which creaks. Also, to be able to synchronize there are some friction between the synchro ring and the idler gear clutch body, so if you are used to shifting gears when the engine speed turns out to be high, it prematurely wears down these components and thus the gearbox.
Tips to fix a cracking speed problem on my Renault Scenic?
It is advisable to start with to change the oil because it's something that can reduce cracking. For more details on the maintenance of a gearbox, do not hesitate to also read the following article: difficult speed to shift Renault Scenic
The price of a gearbox synchro replacement on Renault Scenic:
Repairing a gearbox is very expensive because she requires a little time as well as precision but also expertise. Indeed it is a major element of your Renault Scenic and that requires a lot of concentration so as not to disturb the devices. So we strongly advise to carry out repairs at a garage.
In general to change a sync, for example that of 4th speed it will be necessary count around 800 and 1000 euros. But if the linkage problem was not fixed quickly enough, it is possible that damaged sprocket and in this case you will have to replace everything either on average 1500 to 2000 euros of repair.
To finish: a speed that hangs on Renault Scenic generally is indicative of a sync problem or linkage and that will usually be quite expensive. But if you wait before making the repairs, it will damage the gearbox and damage other gears, therefore costing you more. This is why you should not delay before going to your mechanic.
To go further in the maintenance of your Renault Scenic, you can consult the other pages on the Renault scenic.
