1 Series 125i (N52K) Convertible
MK-21/Meyer
Baugruppe/Group: 23
23 03 98 (347)
Weltweit
All countries
10/1998
Transmission difficult to shift/diagnostic aid
all model series
Complaint:
-
Gears difficult to engage, especially 1st gear
-
Gearshift mechanism catches
Note:
Field observations have shown the cause of transmissions being difficult to shift,
especially of 1st gear being difficult to engage, to be primarily the clutch and only in
a few cases to be the transmission itself. In order to trace the cause in the event of
a complaint, the diagnostic aid described below under the heading Procedure has
been compiled.
Cause:
1.
For possible causes if a clutch problem is diagnosed, please refer to procedure
described below:
-
Taper spline of transmission input shaft not greased or grease dried out
Note on greasing taper spline:
Analyses have shown that grease used until now for greasing the taper spline
"Microlube GL261 BMW" is not suitable for prolonged exposure to high bell
housing temperatures.
-
Drive plate on transmission input shaft difficult to move
-
Drive plate wobble
-
Air in hydraulic system of clutch mechanism
-
Release bearing defective or difficult to move in the guide sleeve
-
Drive plate or clutch pressure plate broken
2.
For possible causes if a transmission problem is diagnosed:
-
External gearshifts difficult, e.g. shift rod joints stiff
-
Gear lever rubber bellows incorrectly fitted, e.g. positioned too high or too low on
the gear lever
-
Soundproofing between the outer gear mechanism and the body incorrectly
inserted, e.g. on the wrong side or crumpled
Cause in transmission
-
Synchronization faulty
-
Inner gearshift mechanism stiff
-
Water in transmission fluid (rare)
Affected
vehicles:
All Models
Remedy:
Actions to remedy difficult to move drive plate on transmission input shaft taper spline:
In 04/1998, the grease used to date to grease the taper spline "Microlube GL261 BMW"
was superseded by the more temperature-resistant grease "Esso UNIREX S2".
In case of repair, the transmission input shaft taper spline is now only to be lubricated using
SI Transmission difficult to shift/diagnostic aid all model series
BMW AG - TIS
17.01.2013 04:43
Issue status (12/2007) Valid only until next DVD is issued
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