Crunching gears randomly

[select]

New Clutch with new bearing is around £450.

I would wait and see how the clutch looks when its removed and depending on your mileage.

[Mike RT4]

Just had mine done as well and seems to have been an amalgamation of issues:
1. Bonnet switches had to be replaced.
2. Salmon relay was showing signs of overheating and had to be replaced.
3. Air in hydraulic actuation - system bled.

I was advised to have the the indent spring replaced by a BMW master technician that I met at the 'ring, but I was advised by my guy at Sycamores that if the indent spring needed replacing, the error comes up continuously in the system log and not randomly as it does with the above causes.

Waiting for the car to come back now in (hopefully) rude health :supz:.

[select]

@Mike Do you know how much it would cost to have the indent springs replaced? As i am told the gearbox needs to be dropped. So probably not cheap.

[Chad]

@Mike Do you know how much it would cost to have the indent springs replaced? As i am told the gearbox needs to be dropped. So probably not cheap.

Hi select. Spring is about £4. But best to replace the pin also ,as the roller bearings wears that's about £20. Four hour job to do yourself. You don't need to take box out. Did mine myself bit of a pig to do, also re use old knock in plug, you need to drop prop exhaust. And lower box as far as possible to pry out plug that holds spring in. Chad

[select]

Thanks Chad, my buddy confirmed that the box does not need to be removed. I will replace all the pins and the bearing while at it.

[Mike RT4]

Hi select. Spring is about £4. But best to replace the pin also ,as the roller bearings wears that's about £20. Four hour job to do yourself. You don't need to take box out. Did mine myself bit of a pig to do, also re use old knock in plug, you need to drop prop exhaust. And lower box as far as possible to pry out plug that holds spring in. Chad

The only thing the technician said when I was in Germany, that if the car has done above 60k and you're replacing the spring, you might as well pull the gearbox out and do the clutch and flywheel at the same time. Expensive, but at least it is done for the next 60-80k miles.

[select]

When you remove the gearbox in order to change the pins then i agree.
But seeing how its possible to change them without removing the box then i would say it isn't worth the extra effort as its at least 2-3 times the work.
Especially if your clutch&Flywheel is still in good nick. (You can check that with DIS, NZ_M3 has posted a guide somewhere).


Regarding toenheel's crunching gears issue, i am curious to hear what the fault was.
But i think bmw will just replace the gearbox and then repair it afterwards.

[Chad]

When you remove the gearbox in order to change the pins then i agree.
But seeing how its possible to change them without removing the box then i would say it isn't worth the extra effort as its at least 2-3 times the work.
Especially if your clutch&Flywheel is still in good nick. (You can check that with DIS, NZ_M3 has posted a guide somewhere).


Regarding toenheel's crunching gears issue, i am curious to hear what the fault was.
But i think bmw will just replace the gearbox and then repair it afterwards.

Also a good tip is to remove front section of air box , if not full air box, also all cabin air filter housing,gearbox support bracket,doing this allows gearbox to be tilted down more , that gives you more acsess to pry out that knock in plug, and easier to put back in,don't forget rollerpin has to be correctly possisiond, As Mike says, if your taking box out definitely would fit new clutch, Bang in some new oil,gear shifts will be bang on, no more faulse neutrals, actually not newtrals, but prity sure it's just clutch that's still engaged, as gps is not recognising proper true gear selection, chad

[toenheel]

Had a call back from my dealer today apparently it's a knackered syncro on 4th gear so they are looking to replace box under warranty. Just awaiting approval from warranty!

[toenheel]

New gearbox on its way under warranty!

[select]

Glad that it all went well.

Curious at how many miles has your gearbox done?

[toenheel]

Glad that it all went well.

Curious at how many miles has your gearbox done?

Cheers, 56k miles.

[GregorFuk]

For those of us that can't wave the warranty flag does anybody rebuild these? Just wondering.

[toenheel]

Picked car up this morning wow! Drivetrain feels much tighter and the car seems to have more get up and go!

[Chad]

Picked car up this morning wow! Drivetrain feels much tighter and the car seems to have more get up and go!

Hi did they actually find out what problem was ,know they suspected fourth gear problem, chad