MZ-b alternator installation on BMW motorcycle models R51/3, R67, R67/2…

19 Апр 2015 | Author: | Комментарии к записи MZ-b alternator installation on BMW motorcycle models R51/3, R67, R67/2… отключены

Fitting the MZ-B 12Volt to R67/2 and R51/3 models early R60�s? etc)

By Henry

Owners of the R67/2 and wanting to replace their 6 charging system, but retain the magneto, will face an challenge to owners of later bikes in fitting the MZ-B Unlike the photo Fig 1. below of an timing case, borrowed Duane�s web site. the earlier case does not have located ventilation channels to run the for the alternator. If the cable is run through the between the alternator and magneto you be unable to refit the original without making some

Fig 1.

Option 1. It may be possible to cut the outer off the alternator cable to feed the through the gap but the thought of fraying the wire insulation, on all those edges, and having a short to earth is not an attractive solution.

2. Cutting a segment completely out of the supplied alternator mounting may allow you to feed the alternator through. One day I will remember/see why I did not the issue this way.

3. My approach was to remove some from the alternator mounting (Fig 2. shows the back of the ring supplied by MZ-B) and a portion of the timing cover from the area circled in the photo of the timing cover, Fig 3.

Fig 2. Fig 3.

When working out where to material from the timing I had the advantage of having it off the bike so was to see where the casting was thickest. Fig 4. what the case looks after competing the grinding of the cover casting. I would recommend that you do not attempt to a channel in an equivalent position to the channels shown in Fig1.

Fig 4.

Fig 5. the alternator cable exiting the MZ-B alternator and the original after grinding a channel in the and the alternator backing plate .

Fig 5.

To remove material from the backing plate a round was employed.

Fig 6. Material was removed the timing case using an drill and a $1 drill bit grinding shown below.

Fig 6.

BMW R67/2


I fit a MZ-B alternator to another Yup. Owners replacing the existing magneto and charging with MZ-B replacement may not have to modify the timing to get it all to fit. They may however to grind off some material the wiring and new coil ignition enter the top casing. For people the magneto ignition — The website states there is space to hide the MZ-B coils in the petrol tank for R51 and R67 models.

The coils will have to be elsewhere, unless you are really the bike is going to end up looking standard�. I have fitted the regulator in the frame where it is by the tank and right out of the way, Fig 6. Time will tell if is excessive heat build up and regulator failure due to insufficient in that location. It seems to be to grind the timing case it is in situ on the bike, I would removing the magneto and alternator

Fig 6.

Stating the obvious

1. If you do not feel with modifying the timing casting on your bike, do not do it.

2. safety glasses when the timing case casting

3. the removal of material from the to a minimum, refit the alternator and frequently to see if the alternator cable through the gap

4. Mask off area�s on the bike you do not want aluminum (proper aluminium) flakes ending up grinding the timing case. It is how the aluminum flakes fly around.


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