SMG Gearboxes

[mattCSLnut]

Originally Posted by mil

Don't know exactly, I would guess that it's just an estimate by the mechanic after he dropped the engine back and not really measured figure.

I spoke about this last year already with Tom Schirmer at the Ring and I think he mentioned that somewhere after 100000km the mountings could need replacement. My problems started at 114k (incl. hundreds of Ring laps) .

//mil

I wonder if this engine mount wear could be measured from the engine bay strut brace to a solid part of the engine, like the cylinder head or something similar. Would be interesting to compare the figures of a 20K miles CSL to lets say a 60K+ miles (100K ish kilometres ) CSL with Track history. I don't have these SMG problems (that you've described) on my CSL (as yet) and I have BMW Warranty but I'm way past the 100,000 kilometres mark and have also driven a fair few laps at the Ring in the past few years
High time for some NEW engine & gear box mounts I thinks but I bet they are NOT covered by BMW Warranty on 60K+ miles cars Group buy anyone ?

[m3novo]

I am facing the same problem. Check spring and was ok.

how can I diagnose syncro or SMG? Anyone know how to use INPA for this diagnose? I noticed it has a lot of analog parameters that could be helpful.

[shane@mbtech]

Originally Posted by m3novo

I am facing the same problem. Check spring and was ok.

how can I diagnose syncro or SMG? Anyone know how to use INPA for this diagnose? I noticed it has a lot of analog parameters that could be helpful.

which spring did you check?

There are 2 separate ones on the left of the box. One behind a screw out bung, and one behind a press fit plug.

There are also 3 springs under the plastic blanking cover on right of the box.

Some don't know to remove the press fit plug.

I've got one in at the minute and the spring has snapped and wedged under the plunger, the plunger was wedged so would not hold it in gear correctly.

The faults with this were difficult getting 4th gear, and slow to get any gears, especially under hard acceleration. The clutch release bearing has also worn on this and was dragging considerably, not helping matters any at all.

Also worth noting if your car has a thud on gearchange or take up of drive, then the flywheel is probably knackered. This car has a bad thud and upon removal of box the flywheel has about an inch of free play.

[shane@mbtech]

Also worth noting that on GT1, it passed all the tests. I did however notice that whilst running through all the gears on the test it was very noisy selecting gear compared to a good box. And did feel a little slow.

But the computer was picking up no faults. Back to old school diagnosis for these type of faults.