SMG II gear change problems - Page 2

The Gorilla · 04-04-2012, 12:24 PM

Hi,

Pure Guess on what your have descibed.

Your selectors in the Gearbox are worn,
and so when you engage, instead of the
detent Springs aligning for selection,
they are mis-aligning, solenoid actuators
clacking, so that there is
resistance at the selection take up.

Changing up under load, so I am guessing
that the 'clacking' noise is the selectors trying
to engage, actuators, hence why you have a delay in
Gear changes.

Changing down, the engine 'Brake' loads as you
change down which loads the drive train and hence
the selection process is again mis-aligned.

I would guess that if you drive hard, lift off,
so as to unload the drive train and select to
change up then it will be much smoother and
without hesitation as the 'selectors' are not
under load and so slide in easier.

Just my guess on what you have said.

Regards,

The Gorilla.

mooriginal · 04-04-2012, 01:07 PM

Quote:

Originally Posted by The Gorilla

Hi,

Pure Guess on what your have descibed.

Your selectors in the Gearbox are worn,
and so when you engage, instead of the
detent Springs aligning for selection,
they are mis-aligning, solenoid actuators
clacking, so that there is
resistance at the selection take up.

Changing up under load, so I am guessing
that the 'clacking' noise is the selectors trying
to engage, actuators, hence why you have a delay in
Gear changes.

Changing down, the engine 'Brake' loads as you
change down which loads the drive train and hence
the selection process is again mis-aligned.

I would guess that if you drive hard, lift off,
so as to unload the drive train and select to
change up then it will be much smoother and
without hesitation as the 'selectors' are not
under load and so slide in easier.

Just my guess on what you have said.

Regards,

The Gorilla.

Thanks Gorilla

That makes sense with how ive been driving while this is happening
Im in s3 mode all the time now
and as I go through the gears im always careful to change up between 2nd to 3rd below 3k revs or with foot off the pedal and not too fast ...
This works every time ...

However today I was caught in front of car up my a$$
and booted it a bit around the roundabout
of course 1-2nd fine but forgot about 3rd

clack clack - clack - clack -clack
I was on so many revs that this time the gear seelctor just flashed at me
i changed up to 4th to try and catch a higher ratio - still flashing

finally id slowed down by now enough that I reselected 2nd which engaged and then went up the gears smoothly

sheesh !

Is there anyway to service the 'selectors'?

The Gorilla · 04-04-2012, 01:10 PM

Hi,

Find a replacement SMG Gearbox
in good condition with as low
mileage as poss, will be by far
the Cheapest option.

Regards,

The Gorilla.

mooriginal · 04-04-2012, 01:17 PM

Quote:

Originally Posted by The Gorilla

Hi,

Find a replacement SMG Gearbox
in good condition with as low
mileage as poss, will be by far
the Cheapest option.

Regards,

The Gorilla.

plug · 04-04-2012, 01:46 PM

Quote:

Originally Posted by The Gorilla

Hi,

Find a replacement SMG Gearbox
in good condition with as low
mileage as poss, will be by far
the Cheapest option.

Regards,

The Gorilla.

Will BMW or Getrag not sell parts separately or something?

The Gorilla · 04-04-2012, 02:47 PM

Hi,

For sure you can purchase parts.

Its like all these things, its finding
somebody that knows what there doing
and how to do it.

Look what work the OP has already
undertaken, some of it un-related for sure,
but the issue still exists.

Just wait to the new wave of Twin Turbo
Motors and their electronic Injection systems
and DCT Gearboxes start to play up, then the fun
and costs will really start big time.

Regards,

The Gorilla.

Bounce · 04-04-2012, 05:20 PM

Could it be as simple as the gear position sensor on the back of the gear box,Elms changed mine when I had a new pump fitted.

**shimmy** · 04-04-2012, 05:54 PM

Quote:

Originally Posted by Bounce

Could it be as simple as the gear position sensor on the back of the gear box,Elms changed mine when I had a new pump fitted.

Just stick to bricks and concrete Brett

Bounce · 04-04-2012, 06:24 PM

Quote:

Originally Posted by shimmy

Just stick to bricks and concrete Brett

I know fook all about those either

shane@mbtech · 04-04-2012, 07:21 PM

Sorry to be a vulture, but we have an smg box here if you need one.

04-04-2012, 12:24 PM	#11
The Gorilla S5, Sport Off, DSC M-track Join Date: Apr 2008 Posts: 740 Casino cash: $14401	Hi, Pure Guess on what your have descibed. Your selectors in the Gearbox are worn, and so when you engage, instead of the detent Springs aligning for selection, they are mis-aligning, solenoid actuators clacking, so that there is resistance at the selection take up. Changing up under load, so I am guessing that the 'clacking' noise is the selectors trying to engage, actuators, hence why you have a delay in Gear changes. Changing down, the engine 'Brake' loads as you change down which loads the drive train and hence the selection process is again mis-aligned. I would guess that if you drive hard, lift off, so as to unload the drive train and select to change up then it will be much smoother and without hesitation as the 'selectors' are not under load and so slide in easier. Just my guess on what you have said. Regards, The Gorilla.

04-04-2012, 01:10 PM	#13
The Gorilla S5, Sport Off, DSC M-track Join Date: Apr 2008 Posts: 740 Casino cash: $14401	Hi, Find a replacement SMG Gearbox in good condition with as low mileage as poss, will be by far the Cheapest option. Regards, The Gorilla.

04-04-2012, 02:47 PM	#16
The Gorilla S5, Sport Off, DSC M-track Join Date: Apr 2008 Posts: 740 Casino cash: $14401	Hi, For sure you can purchase parts. Its like all these things, its finding somebody that knows what there doing and how to do it. Look what work the OP has already undertaken, some of it un-related for sure, but the issue still exists. Just wait to the new wave of Twin Turbo Motors and their electronic Injection systems and DCT Gearboxes start to play up, then the fun and costs will really start big time. Regards, The Gorilla.

04-04-2012, 05:20 PM	#17
Bounce CSL Register Uber-poster! Join Date: Nov 2009 Location: Cornwall Posts: 7,057 Casino cash: $35793	Could it be as simple as the gear position sensor on the back of the gear box,Elms changed mine when I had a new pump fitted.

04-04-2012, 07:21 PM	#20
shane@mbtech CSL Register Uber-poster! Join Date: Feb 2009 Location: warrington Posts: 5,419 Casino cash: $19783	Sorry to be a vulture, but we have an smg box here if you need one.