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Thread: 1983 R80 G/S Cylinder Gasket?

  1. #1

    1983 R80 G/S Cylinder Gasket?

    I'm replacing the gaskets on the cylinders and the push rod seals, etc. I ordered all the parts and noticed in my Clymers' manual that there a gasket at the connection point of the engine block and the cylinder head in the manual (in addition to the rubber gasket)? I don't, however, see it on the Fiche.

    Picture attached and the paper gasket Im looking for should fit between the cylinder head and the engine block. Anyone know if this is a mistake in Clymers or if Fiche just doesn't show it? P.png

  2. #2
    Registered User GTRider's Avatar
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    No paper gasket, just the large cylinder o-ring and the two cylinder stud o-rings. Many of Clymer’s pictures are not year or model specific. Your bike is only 8.2 compression ratio, too, so no need for cylinder spacer plates and such. You WILL want to have a very thin coat of sealant, like Permatex gray, on the cylinder-to-block mating surface—don’t let it get into the area of the cylinder stud o-rings.

    Best,
    DG
    DGerber
    1983 R80ST 1984 R80 G/S PD 1993 R100GS 2004 K1200GT w/Hannigan S/C 2010 K1300GT
    BMWMOA#52184, AMA#271542, IBA#138

  3. #3
    Liaison 20774's Avatar
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    First, I wouldn't trust Clymers in this instance. As for the fiche, that's closer to reality. Any paper or metal gaskets were done away with probably by the /6 series. I know metal gaskets were used on the /2 and early /5 bikes. The R60/5/6/7 bikes have a separate metal gasket that can be used as a compression reducer. But for '83, I suspect it's only the large o-ring...plus a judicious layer of sealant like Permatex Ultra Grey, Hylomar, DreiBond, YamaBond, etc.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
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  4. #4
    Registered User 6322's Avatar
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    Some of the older air heads had a base gasket. Yours doesn't. You have a large "O" ring around the base of the cylinder and two smaller ones that go on the two top studs, at the base of the cylinder. Use grey Permatex to seal the base of the cylinder as you install it. Also when replacing the pushrod seals, put a little grey Permatex on the outer surface of the seal where it goes into the engine block. Good luck with your project.
    Gary Phillips - #6322
    Wildland Firefighter, Retired, Riggins, ID
    Heartland Moto Locos BMW Riders
    '77 R100/7 Dirt Hack, '83 R80ST, '85 K100RS w/EML, '00 R1100RS

  5. #5
    Registered User STEVENRANKIN's Avatar
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    What you see in the Microfiche is correct. If you need part numbers or an up to date fiche, Max BMW website has one you can look up parts on. They also have the parts in stock. St.

  6. #6
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by 6322 View Post
    Some of the older air heads had a base gasket. Yours doesn't. You have a large "O" ring around the base of the cylinder and two smaller ones that go on the two top studs, at the base of the cylinder. Use grey Permatex to seal the base of the cylinder as you install it. Also when replacing the pushrod seals, put a little grey Permatex on the outer surface of the seal where it goes into the engine block. Good luck with your project.
    This is all good except that you never put Permatex, Silicone or any sealant on the push tube rubbers. They need to move a bit as things expand and contract. When installing them I use Red Rubber Grease on them to help them slide into place and conform more easily to the space they sit in. It also preserves rubber and keeps it supple. Oak recommends a bit of engine oil for this but since oil is a petroleum product that breaks down rubber slowly I respectfully disagree with Oak on that one.

    I've done three bikes this year this way and none of them leak from the push tube seals. Never used any sealant on them and never will.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  7. #7
    Quote Originally Posted by happy wanderer View Post
    This is all good except that you never put Permatex, Silicone or any sealant on the push tube rubbers. They need to move a bit as things expand and contract. When installing them I use Red Rubber Grease on them to help them slide into place and conform more easily to the space they sit in. It also preserves rubber and keeps it supple. Oak recommends a bit of engine oil for this but since oil is a petroleum product that breaks down rubber slowly I respectfully disagree with Oak on that one.

    I've done three bikes this year this way and none of them leak from the push tube seals. Never used any sealant on them and never will.
    This is a dynamic connection. Parts move. These seals need to not stick on the tubes. If they stick as the engine cylinders expand the seals lose compression against the block and leak. As stated, sealant is a no-no.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

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