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1982 XJ750 Cam timing pictures?

Discussion in 'XJ Technical Chat' started by Tom, Jan 22, 2015.

  1. Tom

    Tom New Member

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    I'm getting ready to put my cam shafts and chain back together and I don't have a service manual. I was wondering if anyone could post some pic's of TDC and the cam shaft markings so I can be sure I am lining these things up correctly? I searched the forums but didn't see anything with pic's but I could have missed it. So maybe just a link would work.

    Thanks in advance!

    Tom
     
  2. bensalf

    bensalf Active Member

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    ok. these pics are of my 600 engine not 750 ,but the principle should be the same, heres a pic of the shafts at tdc.
    look closely at the middle of the camshaft retaining caps, down at the cam flange you can see a dot on the cap , and a corresponding dot on the camshaft. they're lined up at tdc
    [​IMG]
    hope this helps.
    stu
     
  3. rocs82650

    rocs82650 Well-Known Member Premium Member

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    You should get a manual. Procedure involves rotating the crank at the ignition pick-up then use of a wrench on the cam shaft nut to align the dot. Stu's pic will be the result.

    Gary H.
     
  4. Tom

    Tom New Member

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    I did find another posting on this forum with quit a bit of info. Can you tell by this pic if I'm lined up at Tdc?
     

    Attached Files:

  5. rocs82650

    rocs82650 Well-Known Member Premium Member

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    That's not the timing pointer. The timing pointer should be to the right. That's a firing pin. It will fire 1 and 4 or 2 and 3 when the center plate spins. @TDC the T will align with the pointer and the cam shaft dots will be on the top. Cylinders 1 and 4 will be at the very top of the compression stroke. Make sense? Hope this help.

    Gary H.
     
  6. jayrodoh

    jayrodoh YimYam Premium Member

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    While you'll find a lot of info on here, I still wouldn't attempt to time cams in without a manual. The results of screwing up can be catastrophic. I haven't done my Yam yet but the Kawasaki KZ procedure is pretty detailed and has a couple ways to verify. Kaws you have to pull the cams to change shims.
     
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  7. rocs82650

    rocs82650 Well-Known Member Premium Member

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    I agree with jay. If you don't do this right you'll ruin a good mill.

    Gary H.
     
  8. Tom

    Tom New Member

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    Agreed. I kind of only get one shot at this. I might post some pics after I get it set just to get everyone's blessing. Great forum., Thanks!
     
  9. rocs82650

    rocs82650 Well-Known Member Premium Member

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    Fwiw you can get it right but you can't guess or hope it right. Proper procedure will put it spot on and give you knowlege/experience for future endeavors which might include doing this again. The cost of getting it right far exceed guessing and getting it wrong.

    Gary H.
     
  10. FtUp

    FtUp Well-Known Member

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    this is not right. here is the timing marks showing the advance point for ignition timing. the "t" should line up with the center of the stationary pointer.

    timing marks.jpg

    FU
     
    Last edited: Mar 1, 2015
  11. rocs82650

    rocs82650 Well-Known Member Premium Member

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    Again, the came dots must be on top or you'll have cylinders 2 and 3 @TDC. The cam dots tell you cylinders 1 and 4 are @TDC. And again, you should get a manual. Hope this help.

    Gary H.
     
  12. FtUp

    FtUp Well-Known Member

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    he already has the cams out, so having them at the right place does nothing for the crank.

    FU
     
    Last edited: Mar 1, 2015
  13. rocs82650

    rocs82650 Well-Known Member Premium Member

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    I'd like to help Tom without possibly confusing or mis-leading him. The procedure for doing this is not difficult but must be done correctly.
    I digress.

    Gary H.
     
  14. Polock

    Polock Well-Known Member

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    i wouldn't use that "stationary" pointer. these bikes are 30 years old and that pointer isn't very stout. the paint on the screw doesn't mean anything it the pointer gets bent.
    at least check it with a McDonalds straw in the plug hole.
     
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  15. FtUp

    FtUp Well-Known Member

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    I agree, you cannot rely on the stationary pointer being accurate.

    FU
     
    Last edited: Mar 1, 2015
  16. FtUp

    FtUp Well-Known Member

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    yes. to the op, if you removed the cams without setting the engine to tdc for #1 cylinder before disassembly. then you should put the crank on tdc (see my post above) before you reinstall the cams. then the cams should go in according to the pics rocs posted above. if you roll the crank with the cams in and the chain off, you will bend valves and you will have to remove the head to replace said bent valves.

    FU
     
    Last edited: Mar 1, 2015
  17. Polock

    Polock Well-Known Member

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  18. rocs82650

    rocs82650 Well-Known Member Premium Member

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    All of us were trying to help. However, this is what Tom needs.

    Gary H.
     
  19. Tom

    Tom New Member

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    Oh, wow... Thanks. Let me study this a bit.
     
  20. Polock

    Polock Well-Known Member

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    that's just 3 pages of the book, everyone should have a book
     
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