BMW K bikes (Bricks)

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1Back to top Go down   Cracked manifold!  Empty Cracked manifold! Thu Sep 27, 2018 6:18 pm

Blackthumb

Blackthumb
active member
active member
Hi, today I cleaned all the oily sludge from the bottom of my k100rt (couple of bad gaskets, leaking coolant bottle, split clutch pushrod gaitor, oil from peek hole in water oil/pump) to get a better look at what is underneath and foud that there is a fracture in the front most exhaust outlet manifold jus above the header and sweeping up then laterally to the left... My question is (I think I already know the answer in my heart)... How much of a problem is this for bike + mot testing? Are there any repairs/remidies?

Cracked manifold!  Dsc_0110

    

2Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Thu Sep 27, 2018 7:21 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Did the bike run okay before you found the crack?  If so, I would let it be until it was leaking enough to mess up the running of the engine.  Then I would replace the head with a used one.


__________________________________________________
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   Cracked manifold!  Empty Re: Cracked manifold! Thu Sep 27, 2018 8:52 pm

RicK G

RicK G
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I may be wrong but I think you will find that is a surface mark and not a crack.


__________________________________________________
"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, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

4Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Thu Sep 27, 2018 9:29 pm

Dai

Dai
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I'm with Rick. Looks more like a casting mark.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

5Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Fri Sep 28, 2018 2:52 am

charlie99

charlie99
VIP
VIP
looks like  the head gasket to me

the orientation of the picture is quite ...um deceptive


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OCracked manifold!  Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

6Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Fri Sep 28, 2018 12:07 pm

Born Again Eccentric

Born Again Eccentric
Life time member
Life time member
Has the bike been rear ended? That could result in a crack like that. I can't zoom in and keep a sharp enough picture to say whether it is a crack or casting pattern mark...but I would say crack! Wonderful place this forum  - you ask for an opinion and get opposing ones!

In terms of MOT, I've never know a tester get their head down that low to inspect the underside of the bike and a healthy dose of road dirt in that vicinity will hide such sins...unless it is so bad that it is blowing when the bike is running, in which case the sooty tell tale and escaping exhaust gases give the game away. 

If it is a crack and not blowing, I would simply put a smear of exhaust repair gum over it and smooth it out so it is not obvious.


__________________________________________________
Cracked manifold!  Uk-log10 Cracked manifold!  Sco-lo15
                              Paul  Cracked manifold!  905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

7Back to top Go down   Cracked manifold!  Empty Cracked mani Fri Sep 28, 2018 1:51 pm

Blackthumb

Blackthumb
active member
active member
Yeah it's a crack, I might have a go at welding it, don't like the idea of drilling a bell stop in though 🤪

I don't think she's been rear ended, but the I've got a feeling it may have happened when the guy I bought it from removed the muffler, I was given that separate and the header bolts look undisturbed! The mating faces of the engine components don't seem to sit together great (could be due to the amount of Dow corning "gaskets") and some of them seem mismatched in shape. Runs OK though and can't see any oil in coolant or visa Versa, jus oil on the corner of rocker cover, half way up along the bottom of the timing cover and through the 🕳 in the water pump casing + oil from split gator. Coolant leak is from the perished viewing tube on the expansion tank. It over heated and cut out when waiting to get to temp during oil change... Broken fan! Need to check the thermostat too make sure it's not stuck closed!

Cracked manifold!  Dsc_0111

    

8Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Fri Sep 28, 2018 5:27 pm

MartinW

MartinW
Life time member
Life time member
There is a few tests around to check for cracks, the one I have used was called Dye Mark or Dye Check. There are also a magnetic crack tester which is not applicable to Bricks. An automotive machine shop should be able to do a check which is a very simple process.
Regards Martin.


__________________________________________________
K75s Hybrid
    

9Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Fri Sep 28, 2018 8:47 pm

RicK G

RicK G
admin
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Its a mark on the metal due to probably a bit of dirt/muck/shit and the mark is at the edge as you can see it continues onto the steel and where the arrow points is a break in the "crack".
Cracked manifold!  Dsc_0110


__________________________________________________
"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, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

10Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Sat Sep 29, 2018 4:37 am

Blackthumb

Blackthumb
active member
active member
It's a crack guys...

Cracked manifold!  Dsc_0112
Cracked manifold!  Dsc_0113
Cracked manifold!  Dsc_0114

    

11Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Sat Sep 29, 2018 8:33 am

RicK G

RicK G
admin
admin
OK


__________________________________________________
"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, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

12Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Sat Sep 29, 2018 8:44 am

Blackthumb

Blackthumb
active member
active member
Thanks for taking the time tolook at it in detail though Rick G, think my photos of it are a bit poo... wish it was just a casting blemish though 👎🏼

So I guess short of welding it I should just suck it and see?
Give me time to find a save for new one anyways... 🙄

    

13Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Sat Sep 29, 2018 10:18 am

Laitch

Laitch
Life time member
Life time member
@Blackthumb wrote:.. wish it was just a casting blemish though 👎🏼

So I guess short of welding it I should just suck it and see?
Properly prepare the surface then cover the crack with the appropriate Devcon or JB Weld product. After that, you'll probably be less obsessed by it.

There are the makings of a side- or top-case sticker in your post.
I sucked then I saw
.
  K100-forum.com


__________________________________________________
1995 K75 81,000 miles
Cracked manifold!  Usa-lo10
    

14Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Sat Sep 29, 2018 10:30 am

RicK G

RicK G
admin
admin
Weld it in situ, if the crack is only as far as it is visible then you could just gouge it and fill with weld TIG. You wouldn't put enough heat into it to cause any warping especially as the head is bolted to the block. Use a tungsten burr to clean it up.
The alloy is nothing special and easy to weld.


__________________________________________________
"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, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

15Back to top Go down   Cracked manifold!  Empty Re: Cracked manifold! Sat Sep 29, 2018 10:42 am

Blackthumb

Blackthumb
active member
active member
Yea I think I'll give it a go, I imagen it's made from A356 so should hold fairly srrong if I weld

    

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