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measurements o-ring starter motor xj750f

Discussion in 'XJ Technical Chat' started by xj750y, Dec 1, 2019.

  1. xj750y

    xj750y Member

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    hi,

    does someone know the dimensions of the o-ring for the starter? (the one that sticks to the block).

    its a bit tricky to measure it without having the actual o-ring (i lost mine during the rebuild).

    thanks
     
  2. XJ550H

    XJ550H Well-Known Member Premium Member

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    here is the part number if that helps fits 650 to 900 starters
    O-Ring

    4H7-81847-01-00
     
  3. xj750y

    xj750y Member

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    wow.. that's one expensive o-ring.. !
     
  4. XJ550H

    XJ550H Well-Known Member Premium Member

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    yes it is do not know what is special about it to cost so much
    may be it is an odd sized oring
     
  5. Franz

    Franz Active Member

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    Is there a list of the sizes of all the engine o rings available? They will be Butyl nitrate l assume?
     
  6. Polock

    Polock Well-Known Member

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    there's no pressure on it. i don't see why rtv form-a-gasket won't work. just try not to let it get inside the motor.
    the ones between the head/cylinders for the yics looked like silicone to me
     
  7. Franz

    Franz Active Member

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    Not sure Polock I was wondering if there were a list of sizes as I can get ones that are suitable.
     
  8. mlew

    mlew Well-Known Member

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    Measure it with a set of calipers and see what size it is.
     
  9. lostboy

    lostboy Well-Known Member

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    On one of my engines the drive chain broke and snapped off the starter motor braking the block where the starter nose fits into. After being welded back together an o ring would not seal. I used form a gasket rtv on the shoulder of the starter. It does make it harder to remove the starter but it works.
     
  10. Franz

    Franz Active Member

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    I just got a micrometer l will try that mlew cheers.
     
  11. XJ550H

    XJ550H Well-Known Member Premium Member

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  12. xj750y

    xj750y Member

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    I ordered the most expensive o ring ever. Dont want an oil leak.
     
  13. Franz

    Franz Active Member

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    Thanks XJ550H good idea I will try that.
     

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