BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   1988 K100 Engine oil leak Empty 1988 K100 Engine oil leak Sat Sep 03, 2022 8:36 am

ush1000

ush1000
active member
active member
Hi I have a small oil leak, the back edge of the sump is wet so a little oil is leaking from this area only when bike is being used. Travels back along the smooth area behind the sump (this area has a strange hole in it). Thinking sump gasket maybe? Bike has done 63k miles with good service history. Any thoughts from you guys gratefully gobbled up.

    

2Back to top Go down   1988 K100 Engine oil leak Empty Re: 1988 K100 Engine oil leak Sat Sep 03, 2022 10:18 am

Rick G

Rick G
admin
admin
There is no sump gasket the seal is done using 3Bond or similar. You will find many of the BMW sealing faces are made like that, seems to work well.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1986 K75 GS.
    

3Back to top Go down   1988 K100 Engine oil leak Empty Re: 1988 K100 Engine oil leak Sat Sep 03, 2022 11:54 am

92KK 84WW Olaf

avatar
Life time member
Life time member
ush1000 wrote:Hi I have a small oil leak, the back edge of the sump is wet so a little oil is leaking from this area only when bike is being used. Travels back along the smooth area behind the sump (this area has a strange hole in it). Thinking sump gasket maybe? Bike has done 63k miles with good service history. Any thoughts from you guys gratefully gobbled up.
Examine it very closely to be 100% sure it is coming from that joint. Its an easy repair but be careful removing the bolts. Clean them out well before trying to get the Allen key into them. There is a risk of them being seized in place and wringing the recess for the Allen key and having to drill one out. I would heat them first. That sump is not normally removed in routine maintenance so its likely the bolts are in place since manufacture. 

Now you mention the strange hole in the smooth area behind the sump. This is the bell housing. Your sump is less likely to be a leak cause than this strange hole at the back of the smooth area [bell housing]. Unfortunately if the oil is actually coming out of this hole and migrating forward [the belly pan on an RS causes a vacuum and it does exactly this] you have a bigger issue. At 63k miles its not unexpected here.

In short term both are harmless and I would clean it all up to be doubly sure of the oil source. If the sump was leaking that would leak all the time because its holding all of the oil. If its coming from the bell housing hole it will only come when the bike is being used if the oils are at the correct levels. Your observation points to this.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 49,840 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

4Back to top Go down   1988 K100 Engine oil leak Empty Re: 1988 K100 Engine oil leak Sat Sep 03, 2022 12:05 pm

ush1000

ush1000
active member
active member
Thanks for helpful replies guys

Olaf I will give the area a good clean, I was wondering if the hole was the source. Does this indicate main seal failure and need to split engine/gearbox?

    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum