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1Back to top Go down   K75 Alternator rubber bushes Empty K75 Alternator rubber bushes Thu Mar 04, 2021 12:43 pm

Grahame

Grahame
active member
active member
Started on the replacement of the alternator rubber mounts this morning but have been unable to undo the two most difficult to access socket head bolts. 
Both sockets have been rounded so the 6mm allen key just turns in the socket. The easy access bolt came out with no problem. 
Has anyone got any ideas?


__________________________________________________
K75RT ABS Mystic Red 1995 7th owner
Engine No.753EA 0294
Chassis No. 03706294134
Mileage 24/12/18  40,399
    

2Back to top Go down   K75 Alternator rubber bushes Empty Re: K75 Alternator rubber bushes Thu Mar 04, 2021 1:24 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I have a set of 3/8" drive Torx bits.  When I ran into an Allen screw that the wrench didn't work in, I could loosen it by driving a Torx bit into the head of the screw and then using the ratchet.  It seems the geometry of the Torx bit grips into what remains of the Allen socket.  

Have you removed the battery to allow unimpeded access to the screws?


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   K75 Alternator rubber bushes Empty Re: K75 Alternator rubber bushes Thu Mar 04, 2021 1:29 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
This is also a good time to mention that Allen keys are disposable and need to be replaced from time to time to prevent exactly the damage you are seeing.



Last edited by Point-Seven-five on Thu Mar 04, 2021 1:30 pm; edited 1 time in total


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

4Back to top Go down   K75 Alternator rubber bushes Empty Re: K75 Alternator rubber bushes Thu Mar 04, 2021 1:30 pm

Suzi Q

Suzi Q
Life time member
Life time member
#1 belting a torq bit into it - the hammering can help to loosen the corrosion.
Pre-hammering, i.e. laying into the thing before you even try to remove it, ideally with a flat-ended punch, can also tighten up a sloppy hexagon prior to using a normal bit.


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Sometimes I'm not really Suzi Quatro.
    

5Back to top Go down   K75 Alternator rubber bushes Empty Re: K75 Alternator rubber bushes Thu Mar 04, 2021 1:36 pm

Laitch

Laitch
Life time member
Life time member
Before attempting to loosen neglected fasteners, I always apply heat on them with a heat gun, spray Liquid Wrench around the heads, rap them on their heads then go have a café cubano and catch up on current events, bird watch or make snow angels. When I return, either the bolts crack loose or get another application of heat, penetrant, impact, repose and force until they do. In the last 30 years they always have; the 10 years before that were instructional. 

The basic lesson was don't try loosening a cold, neglected, unlubricated fastener by applying force with a dying strain. Using an electric impact wrench when possible helps break up imbedded corrosion but isn't a substitute for the heat-penentrant-repose part of the cycle preceding its use.

In this case, I'd apply heat and penetrant on the bolt, pound a suitably oversized Torx bit into the rounded fastener—as Point-Seven-five suggested and chris indicated—then go resume meditative activities. On return, I'd give it a try. If the fastener won't yield—or the over-sized bit slips instead—the fastener would be center-drilled with suitably-sized left-hand bit, heat, penetrant and impact applied, an easy-out inserted then extraction force applied.


__________________________________________________
1995 K75 81,000 miles
K75 Alternator rubber bushes Usa-lo10
    

6Back to top Go down   K75 Alternator rubber bushes Empty K75 alternator rubber Thu Mar 04, 2021 2:15 pm

Grahame

Grahame
active member
active member
Thank you all for the suggestions, I did remove the battery etc and used a new allen key socket and 3/8'' ratchet but I think a previous owner has attempted to remove the bolts and rounded out the two sockets. 
I've put it back together for now but will try hammering in a suitable torx socket as well as hitting them with a punch. Don't' think I'll be able to apply heat, they are so awkward to get at, particularly the lower one.
Thanks again for the advise, much appreciated.


__________________________________________________
K75RT ABS Mystic Red 1995 7th owner
Engine No.753EA 0294
Chassis No. 03706294134
Mileage 24/12/18  40,399
    

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