BMW K bikes (Bricks)

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1Back to top Go down    Inlet Manifolds on Fri May 30, 2014 2:36 pm

JGT

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1988 RT with 92,000 miles on the clock. Stripped out the fuel injection side this morning looking for air leaks. ( it runs like a three legged dog at low speed) Of the four inlet manifolds, number 4 the rear one is in pristine condition the other three, the rubber is breaking away from the aluminium body around the allen screw holes, However the rubber manifolds themselves where the throttle bodies clamp too are all in good condition and still flexible. Before stripping I had assumed there would be a loose 'O' ring creating the seal between manifold and head but it looks like its all part of the rubber moulding. As they are £31 each, do I replace them or will some gasket goo give me a good seal? All other rubber parts are in good nick. John


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1987 K75s  1969 Bultaco Matador
    

2Back to top Go down    Re: Inlet Manifolds on Fri May 30, 2014 3:03 pm

RicK G

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Permatex RTV red will do the job or the usual 3bond let it cure for 24 hours before you run it.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

3Back to top Go down    Re: Inlet Manifolds on Fri May 30, 2014 6:38 pm

charlie99

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same as what i found john

by sealing up the face between the head and the rubbers i got a good reliable idle ...

you might notice a notch of rubber at one end of the rubbers that looks as though it might make the rubber sit high on the face  just there ,,,i cut mine off flush ...just in case ...

good luck


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'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

4Back to top Go down    Re: Inlet Manifolds on Fri May 30, 2014 10:01 pm

JGT

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Yes Charlie its odd but three of them did have a raised piece of rubber at one end, yes have cut them off, must be a fault in the mould when they were made. My next problem is the RTV sealant. Can't seem to find either Permatex or threebond in the UK. Any one know of a UK equivalent that is petrol resistant? Have found a number of RTV sealants but not suitable for contact with fuel.  John


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1987 K75s  1969 Bultaco Matador
    

5Back to top Go down    Re: Inlet Manifolds on Fri May 30, 2014 10:19 pm

Inge K.

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Motobins got threebonds..............but it's used as a metal to metal sealant.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

6Back to top Go down    Re: Inlet Manifolds on Fri May 30, 2014 11:29 pm

Inge K.

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I'll guess you could find something you could use among these:

http://www.ebay.co.uk/bhp/high-temperature-gasket-sealant


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

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