(
SERVIINCFEO RMATION
Teohn.Cu โ t.Scrvice
YKT 20 fm/cb/ca
Motor cycle R50/5,R60/5,R75/5
Groups Tranโ โ i โ eion
Munich, Dec.2nd 70
po. 2/70 (295) โข
Bet.a Clutch Coโ plaiat. โ
Dear Sirs,
aa main reason fOr the elutch knock=lika E~l~โขโขโขโขโขt of the
clutch which got known in varioue aa โ ea, ia dae to a too
lar1e axial clearance of the aaim drive11haft of the t.ran โ =
111is11loni n con.oie~tic:m with the a1uยท.r1d,l111J:oi!fi l th<5 d:rยทi-ve โขhaft,
formed by fretting corrosion,
As a remedy adJuat trau โ โ iaaion main drive โขhaft corrdctl7J
the 1iTen axial clearance ia O + 0,1 mm - clean the serration
and lubricate slightly with Molykote-, graphite or BD bearin1
lubricant.
To be sure also c4eck whether ath the enr;tne aide t.be tranaai. โ โ ioa
houain1 ia in order. (transmission abaft)
A knock=like clutch ea1a1ement cu also reault from the fact
that the pressure rod,ordering Noa 2] 211230106,in tbe pide
drilliac of the pres โ ure body,orderina No. 23 21 1 230 107, of
the pressure bearing (ball cage with balls)orderi111 Ho ..
2ยทJ 21 1 2:,0 961, e.1e the centering of the pre โ aare,ordering Ho ..
23 21 1 251 801, aeiโขโขโขโข
Reme~ys
1. Remove transmission according to shop manual article 23 00 020
2. Di โ mount pressure rod, preaave piston and prea โ are beariaa
and check for seiae areas.
J. Remove minor seize marks on the pressure rod with emery paper.
At big damage renew defective parts.
The guide drilling-in pressure piston should have a diameter
of 6.2 H9 mm; if necessary take care for a 0.2 mm clearance
of the pressure rod in the pressure piston. ยทtt you renew the pressure
bearing, control the outer diameter (22t7 h 11 mm). .
4. Installation should be in the opposite procedure. By insertio
of the pressure piston the oil seal should not be turned
backwards.
- 2 -
Kenntnls genommen โข Pris connalssance - Noted - Tomado nota - Preso conoscenza
Beltiebsleitur,g
Direction
Management
nrrr-i,::cit.in
Werkstatt
Atelier
workshop
Toller
KD-Anoohme Gew11hrl.-Sachb. E-Teildienst
R~ceptlon client6Ie lnspecIeur garanlle Service pi6ces d6tach6es
Cust. recepllon Warranty inspector Spare parts service
~eceoci6n clienlela lnsaeclor aamntlo Servicโขo de recamblos
Ablage - Archives โข Fire - Atehlvo
Belrlebsleitung
Direction
MonogemenI
0irecci6n
werks1011
Atelier
workshop
Tolleโข
No. 2/70 (295) e
โข 2 -
The serration should be slightly greased with Kolykote,
'graphite or HD lubricant.
Remarks
It is recollllD.ended to removt' the t.ransmission for this repair
work, because theppressure rod can be inserted from the clutch
aide and the felt seal, ordering No. 2j 21 1 230 41tO, will not
be damaged at all.with this repair method. Before mounting the
felt seal, rinse with grease for hot bearings.
With these two repair methods all cases of knock-like clutch
engagement have been repaired.
Other sources of clutch complaints and repairs are to be done as
follows 1
1. Clutch difficult to operate
1.1. At half pulled hand brakP lbc rlutab release bearing
should be rectangular to the transmission axle.
1.2 Dry mechanically operated elements. Hand lever, cable
line, release lever and all friction areas should be
lubricated.
2. Clutch slipping
2.1. Hot enough clearance. Given release lever clearance of
2 mm to be adjusted,
2.2. At R75/5 cup spring of the R50/5 or R60/5 was installed.
Indicated cup "!J'ing should be installed.
2.J. Preยทssure ring deformed or pressure plate worn out. Replace
worn out parts.
Very truly yours
BAYEnISCHEM OTORENW ERKE
Akt1engesellschaft
ppa.
r--ยท~.- \.ยท'" '~,.'ยท .-
1te 11es1ie
) ./ _\ I >:;II I
Bennewitz$
(
About the Service Bulletin Archive
Searchable index of BMW service bulletins for repair and parts installation for a variety of 247 models. This is not an exhaustive list. If you have ones to share to help complete the archive, please contact us directly.

