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1Back to top Go down   Removing the alternator on a 4 valve K100 Empty Removing the alternator on a 4 valve K100 on Tue Jun 19, 2012 4:26 pm

MT350Explorer

MT350Explorer
Life time member
Life time member
Hi Guys

Not a technical job and one well described in manuals but often a few photos help, especially for relative newcomers to the 'K' (like myself). 2 valve procedure is similar: the alternator fixings are the same. Also see Crazy Frogs post in this section which refers to replacing the bushes etc.

Before: picture of (unplugged) Motronic units (silver box) and ABS unit (black, right).

Removing the alternator on a 4 valve K100 A10

Below, Motronic and ABS units removed (allen keys - simple); battery and battery tray removed (nuts and bolts and a wiring connector or two- also simple). Battery tray had to come out to get access to the 3 allen bolts seccuring the alternator. Pull the power lead straight out of the back of the alternator

Removing the alternator on a 4 valve K100 B10

Below the alternator connector. This is one area of the bike I had not visited before and with corrosion like this it was a miracle the alternator was working! Some contact cleaner and a toothbrush worked wonders

Removing the alternator on a 4 valve K100 C10

Below, it would be a difficult job to undo the two allen bolts securing the alternator that are inside the bike without an allen head socket attachment as they are well recessed and hard to move. I used a 3/8" drive with extension and the bolts came out no problem. There is a third bolt outside the bike beneath the plastic cover that is much more accessible.

Removing the alternator on a 4 valve K100 D10

Below, is the alternator once extracted showing the 'monkey nuts' - 3 sets of two rubber cushions that damp vibration from the alternator. to my eye these looked OK: they had worn evenly and were not broken. The bike also had the same level of vibes with the alternator in or out.

Removing the alternator on a 4 valve K100 E10

Finally, here is a pair of 'simian testicles' removed from the alternator but showing them the correct way up to go in.

Removing the alternator on a 4 valve K100 F10

Then stick it all back together!

Hope this is helpful

Cheers
Dave


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1991 K100 RS 16 valve
    

88

88
Life time member
Life time member
Nice write up Dave and excellent pics - always wondered about the "monkey nuts" myself. It's one area of the bike I haven't figured yet either but looking at your pic of the contacts I might just move that up the list.
88KE


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Removing the alternator on a 4 valve K100 Ir-log11 88....May contain nuts!Removing the alternator on a 4 valve K100 Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

Bike: K100LT 1988. 0172363. AKA the Bullion Brick! Mods: k1100 screen and stands.
K1: 1990. 6374189. Custom Stealth Black paint.
    

MT350Explorer

MT350Explorer
Life time member
Life time member
Cheers 88, hoped it might be of use to someone. Very Happy


__________________________________________________
1991 K100 RS 16 valve
    

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