Page 1 of 4 123 ... LastLast
Results 1 to 10 of 40

Thread: Cylinder Head Won't Budge

  1. #1
    Join Date
    Sep 2018
    Location
    Kirkland, WA
    Posts
    401

    Default Cylinder Head Won't Budge

    Hey guys. I'm working on my 1979 GS850G the moment. I'm trying to lift my cylinder head off the jugs but it just won't budge. Funny thing is the jugs have started to lift, but the head aint movin. I'm worried about breaking a fin if I tap it to hard with a rubber mallet. I'm looking for suggestions to help encourage this cylinder head to separate from the jugs and lift up on it's own. Oh and btw, I can report that all the cylinder head bolts have been removed, even the small one in the front.

  2. #2
    Join Date
    Sep 2012
    Location
    Ireland
    Posts
    4,264

    Default

    The studs often accumulate a collection of rusty crud between them and the barrels. A good soaking with some penetrant will help, but mechanical uppy-downy action is needed.
    What about the small ones at the sides?

    Fer gawd's sake, resist the sledgehammer temptation.
    ---- Dave
    79 GS850N - Might be a trike soon.
    80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
    79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
    92 XJ900F - Fairly Stock, for now.

    Only a dog knows why a motorcyclist sticks his head out of a car window

  3. #3
    Join Date
    Sep 2018
    Location
    Kirkland, WA
    Posts
    401

    Default

    Quote Originally Posted by Grimly View Post
    The studs often accumulate a collection of rusty crud between them and the barrels. A good soaking with some penetrant will help, but mechanical uppy-downy action is needed.
    What about the small ones at the sides?
    Yea, I got the end bolts out too.

    Grimly, can you recommend a penetrant?

    Quote Originally Posted by Grimly View Post
    Fer gawd's sake, resist the sledgehammer temptation.
    Yeah, that sh** makes me nervous

  4. #4
    TeamDar's Avatar
    TeamDar is offline Forum Sage Past Site Supporter
    Super Site Supporter
    Join Date
    Nov 2008
    Location
    St. Louis, MO
    Posts
    1,120

    Default

    There is a bolt at the front of the head in the cam chain area that needs to be removed.

  5. #5
    Join Date
    Sep 2018
    Location
    Kirkland, WA
    Posts
    401

    Default

    Quote Originally Posted by TeamDar View Post
    There is a bolt at the front of the head in the cam chain area that needs to be removed.
    Yeah, I got that one off as well.

  6. #6
    Join Date
    Nov 2012
    Location
    Wyre, Lancashire.uk
    Posts
    921

    Default

    Along with the replies already given, if you can borrow/make something like this
    [url=https://flic.kr/p/2ko2YGZ]
    The big guy up there rides a Suzuki (this I know)
    1981 gs850gx

    1999 RF900
    past bikes. RF900
    TL1000s
    Hayabusa
    Francis Barnett
    various British nails

  7. #7
    Join Date
    Sep 2018
    Location
    Kirkland, WA
    Posts
    401

    Default

    Quote Originally Posted by fastbysuzuki View Post
    Along with the replies already given, if you can borrow/make something like this
    That's interesting fast. Thanks for the pic.

  8. #8
    Join Date
    Sep 2012
    Location
    Ireland
    Posts
    4,264

    Default

    Quote Originally Posted by RustyTank View Post

    Grimly, can you recommend a penetrant?
    Last one had been in place a long time and had accumulated lots of crusty junk around the studs. I just soaked them in diesel and ran some thin-wall tubing down them to jiggle it loose. Definitely helped, as they came off the next day. Be aware, as you lift the barrels off, there's a shovel-ful of dirt wants to fall into the crankcase.
    ---- Dave
    79 GS850N - Might be a trike soon.
    80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
    79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
    92 XJ900F - Fairly Stock, for now.

    Only a dog knows why a motorcyclist sticks his head out of a car window

  9. #9
    Join Date
    Jul 2018
    Location
    Mission Viejo, CA
    Posts
    587

    Default

    I got a free BMW R75/5 a long time ago and the heads were stuck. I grabbed a length of cotton clothesline and stuffed it in the spark plug hole as the pistons were coming up, with valves closed of course. Popped right off. Of course a completely different engine layout and I'm not recommending it necessarily, but it sure was a cool way to solve that vexing problem.
    Tom

  10. #10
    Join Date
    Mar 2005
    Location
    West Slope, OR
    Posts
    11,866

    Default

    Deep Creep for the penetrating oil

    But, since the barrels are lifting, it sounds like the head gasket is stuck.
    Lots of tapping with thin wood blocks along the head/barrel junction. Patience is a virtue here
    You may have to pull the entire engine and remove the entire head and barrel as one, and work on it from there
    1978 GS 1000 (since new)
    1979 GS 1000 (The Fridge, superbike replica project)
    1978 GS 1000 (parts)
    1981 GS 850 (anyone want a project?)
    1981 GPZ 550 (backroad screamer)
    1970 450 Mk IIID (THUMP!)
    2007 DRz 400S
    1999 ATK 490ES
    1994 DR 350SES

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •